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Buildings.UsersGuide.ReleaseNotes

Release notes

Information

This section summarizes the changes that have been performed on the Buildings library.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Package Content

Name Description
Buildings.UsersGuide.ReleaseNotes.Version_2_0_0 Version_2_0_0 Version 2.0.0
Buildings.UsersGuide.ReleaseNotes.Version_1_6_build1 Version_1_6_build1 Version 1.6 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_5_build3 Version_1_5_build3 Version 1.5 build 3
Buildings.UsersGuide.ReleaseNotes.Version_1_5_build2 Version_1_5_build2 Version 1.5 build 2
Buildings.UsersGuide.ReleaseNotes.Version_1_5_build1 Version_1_5_build1 Version 1.5 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_4_build1 Version_1_4_build1 Version 1.4 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_3_build1 Version_1_3_build1 Version 1.3 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_2_build1 Version_1_2_build1 Version 1.2 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_1_build1 Version_1_1_build1 Version 1.1 build 1
Buildings.UsersGuide.ReleaseNotes.Version_1_0_build2 Version_1_0_build2 Version 1.0 build 2
Buildings.UsersGuide.ReleaseNotes.Version_1_0_build1 Version_1_0_build1 Version 1.0 build 1
Buildings.UsersGuide.ReleaseNotes.Version_0_12_0 Version_0_12_0 Version 0.12.0
Buildings.UsersGuide.ReleaseNotes.Version_0_11_0 Version_0_11_0 Version 0.11.0
Buildings.UsersGuide.ReleaseNotes.Version_0_10_0 Version_0_10_0 Version 0.10.0
Buildings.UsersGuide.ReleaseNotes.Version_0_9_1 Version_0_9_1 Version 0.9.1
Buildings.UsersGuide.ReleaseNotes.Version_0_9_0 Version_0_9_0 Version 0.9.0
Buildings.UsersGuide.ReleaseNotes.Version_0_8_0 Version_0_8_0 Version 0.8.0
Buildings.UsersGuide.ReleaseNotes.Version_0_7_0 Version_0_7_0 Version 0.7.0
Buildings.UsersGuide.ReleaseNotes.Version_0_6_0 Version_0_6_0 Version 0.6.0
Buildings.UsersGuide.ReleaseNotes.Version_0_5_0 Version_0_5_0 Version 0.5.0
Buildings.UsersGuide.ReleaseNotes.Version_0_4_0 Version_0_4_0 Version 0.4.0
Buildings.UsersGuide.ReleaseNotes.Version_0_3_0 Version_0_3_0 Version 0.3.0
Buildings.UsersGuide.ReleaseNotes.Version_0_2_0 Version_0_2_0 Version 0.2.0
Buildings.UsersGuide.ReleaseNotes.Version_0_1_0 Version_0_1_0 Version 0.1.0

Buildings.UsersGuide.ReleaseNotes.Version_2_0_0 Buildings.UsersGuide.ReleaseNotes.Version_2_0_0

Version 2.0.0

Information

Version 2.0.0 is a major release that contains various new packages, models and improvements.

The following major additions have been done in version 2.0:

The tables below give more detailed information to the revisions of this library compared to the previous release 1.6 build 1.

The following new libraries have been added:

Buildings.Electrical Library for electrical grid simulation that allows to study building to electrical grid integration. The library contains models of loads, generation and transmission for DC and AC systems.
Buildings.Controls.DemandResponse Library with a model for demand response prediction.
Buildings.Controls.Predictors Library with a data-driven model that predicts the electrical load of a building. The prediction can be done either using an average baseline or a linear regression with respect to outside temperature. For both, optionally a day-of adjustment can be made.

The following new components have been added to existing libraries:

Buildings.Fluid
Buildings.Fluid.Actuators.Valves.TwoWayPressureIndependent Model of a pressure-independent two way valve.
Buildings.Fluid.HeatExchangers.HeaterCooler_T Model of a heater or cooler that takes as an input the set point for the temperature of the fluid that leaves the component. The set point is tracked exactly if the component has sufficient capacity. Optionally, the component can be configured to compute a dynamic rather than a steady-state response.
Buildings.Utilities
Buildings.Utilities.Psychrometrics.Phi_pTX
Buildings.Utilities.Psychrometrics.Functions.phi_pTX
Block and function that computes the relative humidity for given pressure, temperature and water vapor mass fraction.
Buildings.Rooms
Buildings.Rooms.CFD Room model that computes the room air flow using computational fluid dynamics (CFD). The CFD simulation is coupled to the thermal simulation of the room and, through the fluid port, to the air conditioning system. Currently, the supported CFD program is the Fast Fluid Dynamics (FFD) program. See Buildings.Rooms.UsersGuide.CFD for detailed explanations.

The following existing components have been improved in a backward compatible way:

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Added option to obtain the black body sky temperature from a parameter or an input signal rather than computing it in the weather data reader.

Removed redundant connection connect(conHorRad.HOut, cheHorRad.HIn);.
Buildings.Fluid
Buildings.Chillers.ElectricEIR
Buildings.Chillers.ElectricReformulatedEIR
Changed implementation so that the model is continuously differentiable. This is for issue 373.
Buildings.Fluid.HeatExchangers.DryCoilCounterFlow Changed assignment of T_m to avoid using the conditionally enabled model ele[:].mas.T, which is only valid in a connect statement. Moved assignments of Q1_flow, Q2_flow, T1, T2 and T_m outside of equation section to avoid mixing graphical and textual modeling within the same model.
Buildings.Fluid.HeatExchangers.DryCoilDiscretized Removed parameter m1_flow_nominal, as this parameter is already declared in its base class Buildings.Fluid.Interfaces.PartialFourPortInterface. This change avoids an error in OpenModelica as the two declarations had a different value for the min attribute, which is not valid in Modelica.
Buildings.Fluid.HeatExchangers.BaseClasses.CoilRegister
Buildings.Fluid.HeatExchangers.BaseClasses.DuctManifoldDistributor
Reformulated the multiple iterators in the sum function as this language construct is not supported in OpenModelica.
Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab Set start value for hPip(fluid(T)) to avoid a warning about conflicting start values.
Buildings.Fluid.Movers.SpeedControlled_y
Buildings.Fluid.Movers.SpeedControlled_Nrpm
Buildings.Fluid.Movers.FlowControlled_dp
Buildings.Fluid.Movers.FlowControlled_m_flow
For the parameter setting use_powerCharacteristic=true, changed the computation of the power consumption at reduced speed to properly account for the affinity laws. This is in response to #202.
Buildings.Fluid.SolarCollectors.ASHRAE93
Buildings.Fluid.SolarCollectors.EN12975
Reformulated the model to avoid an translation error if glycol is used.
Propagated parameters for initialization in base class Buildings.Fluid.SolarCollectors.BaseClasses.PartialSolarCollector and set prescribedHeatFlowRate=true.
Buildings.Fluid.Storage.StratifiedEnhancedInternalHex Replaced the abs() function in the assignment of the parameter nSegHexTan as the return value of abs() is a Real which causes a type error during model check.
Buildings.HeatTransfer
Buildings.HeatTransfer.Conduction.MultiLayer Changed the assignment of _T_a_start, _T_b_start and RTot to be in the initial equation section as opposed to the parameter declaration. This is needed to avoid an error during model check and translation in Dymola 2015 FD01 beta1.
Buildings.HeatTransfer.Windows.InteriorHeatTransferConvective Changed model to allow a temperature dependent convective heat transfer on the room side. This is for issue 52.
Buildings.Media
Buildings.Media.Interfaces.PartialSimpleIdealGasMedium
Buildings.Media.Interfaces.PartialSimpleMedium
Set T(start=T_default) and p(start=p_default) in the ThermodynamicState record. Setting the start value for T is required to avoid an error due to conflicting start values when translating Buildings.Examples.VAVReheat.ClosedLoop in pedantic mode.
Buildings.Rooms
Buildings.Rooms.MixedAir Changed model to allow a temperature dependent convective heat transfer on the room side for windows. This is for issue 52.
Rooms.BaseClasses.ExteriorBoundaryConditionsWithWindow Conditionally removed the shade model if no shade is present. This corrects #234.

The following existing components have been improved in a non-backward compatible way:

Buildings.Airflow
Buildings.Airflow.Multizone.ZonalFlow_ACS
Buildings.Airflow.Multizone.ZonalFlow_m_flow
Removed parameter forceErrorControlOnFlow as it was not used. For Dymola, the conversion script will automatically update existing models.
Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Changed the following signals for compatibility with OpenModelica:
weaBus.sol.zen to weaBus.solZen.
weaBus.sol.dec to weaBus.solDec.
weaBus.sol.alt to weaBus.solAlt.
weaBus.sol.solHouAng to weaBus.solHouAng.
For Dymola, the conversion script will automatically update existing models.
Buildings.Examples
Buildings.Examples.VAVReheat.Controls.IntegerSum Removed block as it is not used in any model. Models that require an integer sum can use Modelica.Blocks.MathInteger.Sum.
Buildings.Examples.VAVReheat.Controls.UnoccupiedOn Removed block as it is not used in any model.
Buildings.HeatTransfer
Buildings.HeatTransfer.Data.GlazingSystems.Generic Removed parameter nLay as OpenModelica could not assign it during translation. For Dymola, the conversion script will automatically update existing models.
Buildings.HeatTransfer.Conduction.BaseClasses.der_temperature_u Changed the input argument for this function from type Buildings.HeatTransfer.Data.BaseClasses.Material to the elements of this type as OpenModelica fails to translate the model if the input to this function is a record.
Buildings.HeatTransfer.Types.Azimuth
Buildings.HeatTransfer.Types.Tilt
Moved these types from Buildings.HeatTransfer to the top-level package Buildings because they are used in Buildings.BoundaryConditions, Buildings.HeatTransfer and Buildings.Rooms.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid
Buildings.Fluid.FixedResistances.Pipe
Buildings.Fluid.FixedResistances.BaseClasses.Pipe
Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab
Renamed pressure drop from res to preDro to use the same name as in other models. This corrects #271. For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.HeatExchangers.DryCoilDiscretized
Buildings.Fluid.HeatExchangers.WetCoilDiscretized
Reformulated flow splitter in the model to reduce the dimension of the coupled linear or nonlinear system of equations. With this revision, the optional control volume in the duct inlet has been removed as it is no longer needed. Therefore, the parameter dl has also been removed. Replaced the parameters energyDynamics1 and energyDynamics2 with energyDynamics. Removed the parameter ductConnectionDynamics.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed Renamed the model to HeaterCooler_u due to the introduction of the new model HeaterCooler_T.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab
Buildings.Fluid.HeatExchangers.RadiantSlabs.ParallelCircuitsSlab
Changed the models to use by default an ε-NTU approach for the heat transfer between the fluid and the slab rather than a finite difference scheme along the flow path. Optionally, the finite difference scheme can also be used as this is needed for some control design applications.
The new ε-NTU formulation has shown to lead to about five times faster computation on several test cases including the models in Buildings.Rooms.FLEXLAB.Rooms.Examples.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.HeatExchangers.BaseClasses.DuctManifoldFixedResistance Reformulated flow splitter in the model to reduce the dimension of the coupled linear or nonlinear system of equations. With this revision, the optional control volume in the duct inlet has been removed as it is no longer needed. Therefore, the parameters dl and energyDynamics have also been removed.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.HeatExchangers.BaseClasses.CoilRegister Replaced the parameters energyDynamics1 and energyDynamics2 with the new parameter energyDynamics. Removed the parameters steadyState_1 and steadyState_2 as this information is already contained in energyDynamics.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.MassExchangers.HumidifierPrescribed Renamed the model to Humidifier_u due to the introduction of the new model HeaterCooler_T and to use the same naming pattern as HeaterCooler_u.
For Dymola, the conversion script will automatically update existing models.
Buildings.Fluid.Movers This package has been redesigned. The models have been renamed as follows:
Buildings.Fluid.Movers.FlowMachine_dp is now called Buildings.Fluid.Movers.FlowControlled_dp.
Buildings.Fluid.Movers.FlowMachine_m_flow is now called Buildings.Fluid.Movers.FlowControlled_m_flow.
Buildings.Fluid.Movers.FlowMachine_Nrpm is now called Buildings.Fluid.Movers.SpeedControlled_Nrpm.
Buildings.Fluid.Movers.FlowMachine_y is now called Buildings.Fluid.Movers.SpeedControlled_y.

In addition, the performance data of all movers are now stored in a record. These records are in Buildings.Fluid.Movers.Data. For most existing instances, it should be sufficient to enclose the existing performance data in a record called per. For example,
Buildings.Fluid.Movers.FlowMachine_y fan(
 redeclare package Medium = Medium,
 pressure(
  V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
  dp={2*dp_nominal,dp_nominal,0})));
becomes
Buildings.Fluid.Movers.SpeedControlled_y fan(
 redeclare package Medium = Medium,
 per(
  pressure(
   V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
   dp={2*dp_nominal,dp_nominal,0})));

See the User's Guide for more information about these records.

For Dymola, the conversion script will update existing models to use the old implementations which are now in the package Buildings.Obsolete.Fluid.Movers.
Buildings.Media
Buildings.Media Renamed all media to simplify the media selection. For typical building energy simulation, Buildings.Media.Air and Buildings.Media.Water should be used.

The following changes were made.

Renamed Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated
to Buildings.Media.Air.

Renamed Buildings.Media.ConstantPropertyLiquidWater
to Buildings.Media.Water.

Renamed Buildings.Media.PerfectGases.MoistAir
to Buildings.Obsolete.Media.PerfectGases.MoistAir.

Renamed Buildings.Media.GasesConstantDensity.MoistAirUnsaturated
to Buildings.Obsolete.Media.GasesConstantDensity.MoistAirUnsaturated.

Renamed Buildings.Media.GasesConstantDensity.MoistAir
to Buildings.Obsolete.Media.GasesConstantDensity.MoistAir.

Renamed Buildings.Media.GasesConstantDensity.SimpleAir
to Buildings.Obsolete.Media.GasesConstantDensity.SimpleAir.

Renamed Buildings.Media.IdealGases.SimpleAir
to Buildings.Obsolete.Media.IdealGases.SimpleAir.

Renamed Buildings.Media.GasesPTDecoupled.MoistAir
to Buildings.Obsolete.Media.GasesPTDecoupled.MoistAir.

Renamed Buildings.Media.GasesPTDecoupled.SimpleAir
to Buildings.Obsolete.Media.GasesPTDecoupled.SimpleAir.

For Dymola, the conversion script will update existing models according to the above list.
Buildings.Media.Water Removed option to model water as a compressible medium as this option was not useful.
Buildings.Rooms
Buildings.Rooms.BaseClasses.ParameterConstructionWithWindow Removed the keyword replaceable for the parameters ove and sidFin.
Models that instantiate Buildings.Rooms.MixedAir are not affected by this change.
Buildings.Rooms.Examples.BESTEST Moved the package to Buildings.Rooms.Validation.BESTEST.
Buildings.Utilities
Buildings.Utilities.SimulationTime Moved the block Buildings.Utilities.SimulationTime to Buildings.Utilities.Time.ModelTime.
For Dymola, the conversion script will update existing models according to the above list.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Corrected error that led the total and opaque sky cover to be ten times too low if its value was obtained from the parameter or the input connector. For the standard configuration in which the sky cover is obtained from the weather data file, the model was correct. This error only affected the other two possible configurations.
Buildings.Fluid
Buildings.Fluid.Data.Pipes Corrected wrong entries for inner and outer diameter of PEX pipes.
Buildings.Fluid.HeatExchangers.Boreholes.BaseClasses.singleUTubeResistances Corrected error in function that used beta before it was assigned a value.
Buildings.Fluid.Storage.Stratified
Buildings.Fluid.Storage.StratifiedEnhanced
Buildings.Fluid.Storage.StratifiedEnhancedInternalHex
Replaced the use of Medium.lambda_const with Medium.thermalConductivity(sta_default) as lambda_const is not declared for all media. This avoids a translation error if certain media are used.
Buildings.Fluid.Storage.StratifiedEnhancedInternalHex Corrected issue #271 which led to a compilation error if the heat exchanger and the tank had different media.
Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer Corrected issue #304 that led to an error in the glass temperatures if the glass conductance is very small.
Buildings.Rooms
Buildings.Rooms.MixedAir Added propagation of the parameter value linearizeRadiation to the window model. Prior to this change, the radiation was never linearized for computing the glass long-wave radiation.
Buildings.Rooms.FLEXLAB.Rooms.Examples.TestBedX3WithRadiantFloor
Buildings.Rooms.FLEXLAB.Rooms.Examples.X3AWithRadiantFloor
Buildings.Rooms.FLEXLAB.Rooms.Examples.X3BWithRadiantFloor
Corrected wrong entries for inner and outer diameter of PEX pipes.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.Fluid
Buildings.Fluid.FixedResistances.FixedResistanceDpM Corrected error in documentation of computation of k.
Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer Changed type of tauIR from Modelica.SIunits.Emissivity to Modelica.SIunits.TransmissionCoefficient. This avoids a type error in OpenModelica.

Note:

With version 2.0, we start using semantic versioning as described at http://semver.org/.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_2_0_0 "Version 2.0.0" extends Modelica.Icons.ReleaseNotes; end Version_2_0_0;

Buildings.UsersGuide.ReleaseNotes.Version_1_6_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_6_build1

Version 1.6 build 1

Information

Version 1.6 build 1 updates the Buildings library to the Modelica Standard Library 3.2.1 and to Modelica_StateGraph2 2.0.2.

This is the first version of the Buildings library that contains models from the IEA EBC Annex 60 library, a Modelica library for building and community energy systems that is collaboratively developed within the project "New generation computational tools for building and community energy systems based on the Modelica and Functional Mockup Interface standards", a project that is conducted under the Energy in Buildings and Communities Programme (EBC) of the International Energy Agency (IEA).

The following new components have been added to existing libraries:

Buildings.Fluid
Buildings.Fluid.Actuators.Valves.TwoWayTable Two way valve for which the opening characteristics is specified by a table.
Buildings.Utilities.Math
Buildings.Utilities.Math.Examples.Average Buildings.Utilities.Math.Examples.InverseXRegularized Buildings.Utilities.Math.Examples.Polynominal Buildings.Utilities.Math.Examples.PowerLinearized Buildings.Utilities.Math.Examples.QuadraticLinear Buildings.Utilities.Math.Examples.RegNonZeroPower Buildings.Utilities.Math.Examples.SmoothExponential Buildings.Utilities.Math.Functions.average Buildings.Utilities.Math.Functions.booleanReplicator Buildings.Utilities.Math.Functions.Examples.IsMonotonic Buildings.Utilities.Math.Functions.Examples.TrapezoidalIntegration Buildings.Utilities.Math.Functions.integerReplicator Buildings.Utilities.Math.InverseXRegularized Buildings.Utilities.Math.Polynominal Buildings.Utilities.Math.PowerLinearized Buildings.Utilities.Math.QuadraticLinear Buildings.Utilities.Math.RegNonZeroPower Buildings.Utilities.Math.SmoothExponential Buildings.Utilities.Math.TrapezoidalIntegration Various functions and blocks for mathematical operations.
Buildings.Utilities.Psychrometrics
Buildings.Utilities.Psychrometrics.Examples.SaturationPressureLiquid Buildings.Utilities.Psychrometrics.Examples.SaturationPressure Buildings.Utilities.Psychrometrics.Examples.SublimationPressureIce Buildings.Utilities.Psychrometrics.Functions.BaseClasses.der_saturationPressureLiquid Buildings.Utilities.Psychrometrics.Functions.BaseClasses.der_sublimationPressureIce Buildings.Utilities.Psychrometrics.Functions.BaseClasses.Examples.SaturationPressureDerivativeCheck Buildings.Utilities.Psychrometrics.Functions.Examples.SaturationPressure Buildings.Utilities.Psychrometrics.Functions.saturationPressureLiquid Buildings.Utilities.Psychrometrics.Functions.saturationPressure Buildings.Utilities.Psychrometrics.Functions.sublimationPressureIce Buildings.Utilities.Psychrometrics.SaturationPressureLiquid Buildings.Utilities.Psychrometrics.SaturationPressure Buildings.Utilities.Psychrometrics.SublimationPressureIce Various functions and blocks for psychrometric calculations.

The following existing components have been improved in a backward compatible way:

Buildings.Fluid
Buildings.Fluid.Interfaces.PartialTwoPortInterface
Buildings.Fluid.Interfaces.PartialFourPortInterface
Removed call to homotopy function in the computation of the connector variables as these are conditionally enabled variables and therefore must not be used in any equation. They are only for output reporting.
Buildings.Fluid.Actuators.Dampers.Exponential Improved documentation of the flow resistance.
Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3
Added the option to use a constant, an input signal or the weather file as the source for the ceiling height, the total sky cover, the opaque sky cover, the dew point temperature, and the infrared horizontal radiation HInfHor.

The following existing components have been improved in a non-backward compatible way:

Buildings.Fluid
Buildings.Fluid.Movers.FlowMachinePolynomial Moved the model to the package Buildings.Obsolete, as this model is planned to be removed in future versions. The conversion script should update old instances of this model automatically in Dymola. Users should change their models to use a flow machine from the package Buildings.Fluid.Movers.
Buildings.Fluid.Storage.ExpansionVessel Simplified the model to have a constant pressure. The following non-backward compatible changes have been made.
  1. The parameter VTot was renamed to V_start.
  2. The following parameters were removed: VGas0, pMax, energyDynamics and massDynamics.
The conversion script should update old instances of this model automatically in Dymola.
Buildings.Fluid.Storage.StratifiedEnhancedInternalHex Revised the model as the old version required the porta of the heat exchanger to be located higher than portb. This makes sense if the heat exchanger is used to heat up the tank, but not if it is used to cool down a tank, such as in a cooling plant. The following parameters were changed:
  1. Changed hexTopHeight to hHex_a.
  2. Changed hexBotHeight to hHex_b.
  3. Changed topHexSeg to segHex_a, and made it protected as this is deduced from hHex_a.
  4. Changed botHexSeg to segHex_b, and made it protected as this is deduced from hHex_b.
The names of the following ports have been changed:
  1. Changed port_a1 to portHex_a.
  2. Changed port_b1 to portHex_b.
The conversion script should update old instances of this model automatically in Dymola for all of the above changes.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Fluid
Buildings.Fluid.HeatExchangers.Boreholes.UTube Reimplemented the resistor network inside the borehole as the old implementation led to too slow a transient response. This change also led to the removal of the parameters B0 and B1 as the new implementation does not require them.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.Fluid
Buildings.Fluid.HeatExchangers.Boreholes.BaseClasses.HexInternalElement Corrected error in documentation which stated a wrong default value for the pipe spacing.
Buildings.Fluid.HeatExchangers.BaseClasses.ntu_epsilonZ() Added dummy argument to function call of Internal.solve to avoid a warning during model check in Dymola 2015.
Buildings.Fluid.HeatExchangers.DryEffectivenessNTU Changed assert statement to avoid comparing enumeration with an integer, which triggers a warning in Dymola 2015.
Buildings.Rooms.Constructions.Examples.ExteriorWall
Buildings.Rooms.Constructions.Examples.ExteriorWallWithWindow
Buildings.Rooms.Constructions.Examples.ExteriorWallTwoWindows
Corrected wrong assignment of parameter in instance bouConExt(conMod=...) which was set to an interior instead of an exterior convection model.
Buildings.Utilities.Psychrometrics.Functions.TDewPoi_pW() Added dummy argument to function call of Internal.solve to avoid a warning during model check in Dymola 2015.

The following issues have been fixed:

Buildings.Fluid
#196 Change capacity location in borehole grout.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_6_build1 "Version 1.6 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_6_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_5_build3 Buildings.UsersGuide.ReleaseNotes.Version_1_5_build3

Version 1.5 build 3

Information

Version 1.5 build 3 is a maintenance release that corrects an error in Buildings.Fluid.MassExchangers.HumidifierPrescribed. It is fully compatible with version 1.5 build 2.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Fluid
Buildings.Fluid.MassExchangers.HumidifierPrescribed Corrected the enthalpy balance, which caused the latent heat flow rate to be added twice to the fluid stream. This closes issue #197.

The following issues have been fixed:

HumidifierPrescribed accounts twice for latent heat gain
#197 This issue has been addressed by correcting the latent heat added to the fluid stream.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_5_build3 "Version 1.5 build 3" extends Modelica.Icons.ReleaseNotes; end Version_1_5_build3;

Buildings.UsersGuide.ReleaseNotes.Version_1_5_build2 Buildings.UsersGuide.ReleaseNotes.Version_1_5_build2

Version 1.5 build 2

Information

Version 1.5 build 2 is a maintenance release that corrects an error in Buildings.Fluid.HeatExchangers.DryCoilDiscretized and in Buildings.Fluid.HeatExchangers.WetCoilDiscretized. It is fully compatible with version 1.5 build 1.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Fluid
Buildings.Fluid.HeatExchangers.DryCoilDiscretized
Buildings.Fluid.HeatExchangers.WetCoilDiscretized
Corrected wrong connect statements that caused the last register to have no liquid flow. This closes issue #194.

The following issues have been fixed:

DryCoilDiscretized model not using last register, liquid flow path
#194 This issue has been addressed by correcting the connect statements.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_5_build2 "Version 1.5 build 2" extends Modelica.Icons.ReleaseNotes; end Version_1_5_build2;

Buildings.UsersGuide.ReleaseNotes.Version_1_5_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_5_build1

Version 1.5 build 1

Information

Version 1.5 build 1 is a major release that contains new packages with models for solar collectors and for the Facility for Low Energy Experiments (FLEXLAB) at the Lawrence Berkeley National Laboratory.

This release also contains a major revision of all info sections to correct invalid html syntax. The package Buildings.HeatTransfer.Radiosity has been revised to comply with the Modelica language specification. The package Buildings.Rooms has been revised to aid implementation of non-uniformly mixed room air models. This release also contains various corrections that avoid warnings during translation when used with Modelica 3.2.1. Various models have been revised to increase compatibility with OpenModelica. However, currently only a subset of the models work with OpenModelica.

The following new libraries have been added:

Buildings.Fluid.SolarCollectors Library with solar collectors.
Buildings.Rooms.FLEXLAB Package with models for test cells of LBNL's FLEXLAB (Facility for Low Energy Experiments in Buildings).
Buildings.Utilities.IO.FLEXLAB Package that demonstrates two-way data exchange between Modelica and LBNL's FLEXLAB (Facility for Low Energy Experiments in Buildings).

The following new components have been added to existing libraries:

Buildings.Fluid.Storage
Buildings.Fluid.Storage.StratifiedEnhancedInternalHex Added a model of a tank with built-in heat exchanger. This model may be used together with solar thermal plants.
Buildings.Resources
Buildings.Resources.Include Added an Include folder and the bcvtb.h header file to it to fix compilation errors in BCVTB example files.

The following existing components have been improved in a backward compatible way:

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3
Buildings.BoundaryConditions.WeatherData.BaseClasses.getAbsolutePath
Improved the algorithm that determines the absolute path of the file. Now weather files are searched in the path specified, and if not found, the urls file://, modelica:// and modelica://Buildings are added in this order to search for the weather file. This allows using the data reader without having to specify an absolute path, as long as the Buildings library is on the MODELICAPATH.
Buildings.Fluid
Buildings.Fluid.Interfaces.StaticTwoPortConservationEquation Reformulated computation of outlet properties to avoid an event at zero mass flow rate.
Buildings.Fluid.HeatExchangers.CoolingTowers.YorkCalc Simplified the implementation for the situation if allowReverseFlow=false. Avoided the use of the conditionally enabled variables sta_a and sta_b as this was not proper use of the Modelica syntax.
Buildings.Fluid.Interfaces.Examples.ReverseFlowHumidifier Changed one instance of Modelica.Fluid.Sources.MassFlowSource_T, that was connected to the two fluid streams, to two instances, each having half the mass flow rate. This is required for the model to work with Modelica 3.2.1 due to the change introduced in ticket #739.
Buildings.Fluid.Sensors.EnthalpyFlowRate
Buildings.Fluid.Sensors.SensibleEnthalpyFlowRate
Buildings.Fluid.Sensors.LatentEnthalpyFlowRate
Buildings.Fluid.Sensors.VolumeFlowRate
Removed default value tau=0 as the base class already sets tau=1. This change was made so that all sensors use the same default value.
Buildings.Fluid.Sensors.TraceSubstancesTwoPort Added default value C_start=0.
Buildings.HeatTransfer
Buildings.HeatTransfer.Data.OpaqueConstructions.Generic Changed the annotation of the instance material from Evaluate=true to Evaluate=false. This is required to allow changing the material properties after compilation. Note, however, that the number of state variables in Buildings.HeatTransfer.Data.BaseClasses.Material are only computed when the model is translated, because the number of state variables is fixed at compilation time.
Buildings.Utilities
Buildings.Utilities.Diagnostics.AssertEquality
Buildings.Utilities.Diagnostics.AssertInequality
Added time in print statement as OpenModelica, in its error message, does not output the time when the assert is triggered.

The following existing components have been improved in a non-backward compatible way:

Buildings.Airflow
Buildings.Airflow.Multizone.Orifice
Buildings.Airflow.Multizone.EffectiveAirLeakageArea
Buildings.Airflow.Multizone.ZonalFlow_ACS
Changed the parameter useConstantDensity to useDefaultProperties to use consistent names within this package. A conversion script in Resources/Scripts/Dymola can be used to update old models that use this parameter.
Buildings.Fluid
Buildings.Fluid.BaseClasses.IndexWater Renamed class to Buildings.Fluid.BaseClasses.IndexMassFraction as it is applicable for all mass fraction sensors.
Buildings.Fluid.HeatExchangers.ConstantEffectiveness
Buildings.Fluid.HeatExchangers.DryEffectivenessNTU
Buildings.Fluid.Interfaces.ConservationEquation
Buildings.Fluid.Interfaces.StaticFourPortHeatMassExchanger
Buildings.Fluid.Interfaces.StaticTwoPortConservationEquation
Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger
Buildings.Fluid.MassExchangers.ConstantEffectiveness
Buildings.Fluid.MassExchangers.HumidifierPrescribed
Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolumeWaterPort
Buildings.Fluid.MixingVolumes.MixingVolume
Buildings.Fluid.MixingVolumes.MixingVolumeDryAir
Buildings.Fluid.MixingVolumes.MixingVolumeMoistAir
Buildings.Fluid.Storage.ExpansionVessel
Changed the input connector mXi_flow (or mXi1_flow and mXi2_flow) to mWat_flow (or mWat1_flow and mWat2_flow). This change has been done as declaring mXi_flow is ambiguous because it does not specify what other species are added unless a mass flow rate m_flow is also known. To avoid this confusion, the connector variables have been renamed. The equations that were used were, however, correct. This addresses issue #165.
Buildings.Fluid.Storage.BaseClasses.IndirectTankHeatExchanger
Buildings.Fluid.BaseClasses.PartialResistance
Buildings.Fluid.FixedResistances.BaseClasses.Pipe
Buildings.Fluid.FixedResistances.FixedResistanceDpM
Buildings.Fluid.FixedResistances.LosslessPipe
Buildings.Fluid.HeatExchangers.Boreholes.BaseClasses.BoreholeSegment
Buildings.Fluid.HeatExchangers.Boreholes.UTube
Buildings.Fluid.HeatExchangers.RadiantSlabs.ParallelCircuitsSlab
Buildings.Fluid.Interfaces.FourPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialFourPortInterface
Buildings.Fluid.Interfaces.PartialTwoPortInterface
Buildings.Fluid.Interfaces.StaticFourPortHeatMassExchanger
Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger
Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger
Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolume
Buildings.Fluid.Movers.BaseClasses.FlowControlled
Buildings.Fluid.Movers.BaseClasses.IdealSource
Buildings.Fluid.Movers.BaseClasses.PrescribedFlowMachine
Removed the computation of V_flow and removed the parameter show_V_flow. The reason is that the computation of V_flow required the use of sta_a (to compute the density), but sta_a is also a variable that is conditionally enabled. However, this was not correct Modelica syntax as conditional variables can only be used in a connect statement, not in an assignment. Dymola 2014 FD01 beta3 is checking for this incorrect syntax. Hence, V_flow was removed as its conditional implementation would require a rather cumbersome implementation that uses a new connector that carries the state of the medium.
Buildings.Fluid.MixingVolumes Removed Buildings.Fluid.MixingVolumes.MixingVolumeDryAir as this model is no longer used. The model Buildings.Fluid.MixingVolumes.MixingVolume can be used instead of.
Removed base class Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolumeWaterPort as this model is no longer used.
Buildings.Fluid.Sensors.Examples.TraceSubstances Renamed example from ExtraProperty to TraceSubstances in order to use the same name as the sensor.
Buildings.Fluid.Sources.PrescribedExtraPropertyFlowRate Renamed model toTraceSubstancesFlowRate to use the same terminology than the Modelica Standard Library.
The conversion script updates existing models that instantiate this model.
Buildings.Fluid.Sources.Examples.PrescribedExtraPropertyFlow Renamed example toTraceSubstancesFlowRate in order to use the same name as the source model.
Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolume
Buildings.Fluid.FixedResistances.Pipe
Buildings.Fluid.HeatExchangers.RadiantSlabs.ParallelCircuitsSlab
Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab
Buildings.Fluid.Movers.BaseClasses.FlowControlled
Renamed X_nominal to X_default or X_start, where X may be state, rho, or mu, depending on whether the medium default values or the start values are used in the computation of the state and derived quantities.
Buildings.HeatTransfer
Buildings.Rooms
Buildings.HeatTransfer.Interfaces.RadiosityInflow
Buildings.HeatTransfer.Interfaces.RadiosityOutflow
Buildings.HeatTransfer.Radiosity.BaseClasses.ParametersTwoSurfaces
Buildings.HeatTransfer.Radiosity.Constant
Buildings.HeatTransfer.Radiosity.Examples.OpaqueSurface
Buildings.HeatTransfer.Radiosity.Examples.OutdoorRadiosity
Buildings.HeatTransfer.Radiosity.IndoorRadiosity
Buildings.HeatTransfer.Radiosity.OpaqueSurface
Buildings.HeatTransfer.Radiosity.OutdoorRadiosity
Buildings.HeatTransfer.Radiosity.RadiositySplitter
Buildings.HeatTransfer.Radiosity.package
Buildings.HeatTransfer.Windows.BaseClasses.Examples.CenterOfGlass
Buildings.HeatTransfer.Windows.BaseClasses.Examples.GlassLayer
Buildings.HeatTransfer.Windows.BaseClasses.Examples.Shade
Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer
Buildings.HeatTransfer.Windows.BaseClasses.Shade
Buildings.HeatTransfer.Windows.Examples.BoundaryHeatTransfer
Buildings.HeatTransfer.Windows.ExteriorHeatTransfer
Buildings.HeatTransfer.Windows.InteriorHeatTransfer
Buildings.Rooms.BaseClasses.InfraredRadiationExchange
Buildings.Rooms.BaseClasses.InfraredRadiationGainDistribution
Buildings.Rooms.BaseClasses.MixedAir
Buildings.Rooms.BaseClasses.Overhang
Buildings.Rooms.BaseClasses.SideFins
Changed the connectors for the radiosity model. The previous implemenation declared the radiosity as a flow variables, but the implementation did not use a potential variable.
Therefore, the radiosity was the only variable in the connector, which is not allowed for flow variables. This change required a reformulation of models because with the new formulation, the incoming and outcoming radiosity are both non-negative values. This addresses issue #158.
Buildings.HeatTransfer
Buildings.Rooms
Buildings.HeatTransfer.Windows.BaseClasses.PartialConvection
Buildings.HeatTransfer.Windows.BaseClasses.PartialWindowBoundaryCondition
Buildings.HeatTransfer.Windows.BaseClasses.Shade
Buildings.HeatTransfer.Windows.BaseClasses.ShadeConvection
Buildings.HeatTransfer.Windows.BaseClasses.ShadeRadiation
Buildings.HeatTransfer.Windows.InteriorHeatTransfer
Buildings.HeatTransfer.Windows.InteriorHeatTransferConvective
Buildings.Rooms.ExteriorBoundaryConditionsWithWindow
Buildings.Rooms.PartialSurfaceInterface
Buildings.Rooms.InfraredRadiationExchange
Buildings.Rooms.AirHeatMassBalanceMixed
Buildings.Rooms.SolarRadiationExchange
Buildings.Rooms.RadiationTemperature
Buildings.Rooms.InfraredRadiationGainDistribution
Redesigned the implementation of the room model and its base classes. This redesign separates convection from radiation, and it provides one composite model for the convection and the heat and mass balance in the room. This change was done to allow an implementation of the room air heat and mass balance that does not assume uniformly mixed room air.
Buildings.HeatTransfer
Buildings.HeatTransfer.Convection.Functions.HeatFlux.rayleigh Renamed function from raleigh to rayleigh.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Fluid
Buildings.Fluid.Sensors.SpecificEntropyTwoPort Corrected wrong computation of the dynamics used for the sensor signal.
Buildings.HeatTransfer
Buildings.HeatTransfer.Data.GlazingSystems.DoubleClearAir13Clear Corrected the glass layer thickness, which was 5.7 mm instead of 3 mm, as the documentation states.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings
Buildings.BoundaryConditions.SkyTemperature.BlackBody
Buildings.BoundaryConditions.WeatherData.BaseClasses.CheckTemperature
Buildings.BoundaryConditions.WeatherData.ReaderTMY3
Buildings.Controls.SetPoints.HotWaterTemperatureReset
Buildings.Examples.ChillerPlant.BaseClasses.Controls.ChillerSwitch
Buildings.Examples.ChillerPlant.BaseClasses.Controls.WSEControl
Buildings.Fluid.Boilers.BoilerPolynomial
Buildings.Fluid.HeatExchangers.BaseClasses.HexElement
Buildings.Fluid.HeatExchangers.BaseClasses.MassExchange
Buildings.Fluid.HeatExchangers.BaseClasses.MassExchangeDummy
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.ApparatusDewPoint
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.ApparatusDryPoint
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.CoolingCapacity
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.DXCooling
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.DryCoil
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.DryWetSelector
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.Evaporation
Buildings.Fluid.HeatExchangers.DXCoils.BaseClasses.WetCoil
Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolumeWaterPort
Buildings.Fluid.Sensors.RelativeTemperature
Buildings.Fluid.Sensors.Temperature
Buildings.Fluid.Sensors.TemperatureTwoPort
Buildings.Fluid.Sensors.TemperatureWetBulbTwoPort
Buildings.Fluid.SolarCollectors.BaseClasses.PartialHeatLoss
Buildings.Utilities.Comfort.Fanger
Buildings.Utilities.IO.BCVTB.From_degC
Buildings.Utilities.IO.BCVTB.To_degC
Buildings.Utilities.Psychrometrics.TDewPoi_pW
Buildings.Utilities.Psychrometrics.TWetBul_TDryBulPhi
Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi
Buildings.Utilities.Psychrometrics.WetBul_pTX
Buildings.Utilities.Psychrometrics.pW_TDewPoi
Replaced wrong attribute quantity="Temperature" with quantity="ThermodynamicTemperature".
Buildings.Fluid
Buildings.Fluid.Data.Fuels.Generic Corrected wrong type for mCO2. It was declared as Modelica.SIunits.MassFraction, which is incorrect.
Buildings.Fluid.HeatExchangers.CoolingTowers.Correlations.BaseClasses.Bounds Corrected wrong type for FRWat_min, FRWat_max and liqGasRat_max. They were declared as Modelica.SIunits.MassFraction, which is incorrect as, for example, FRWat_max can be larger than one.
Buildings.Fluid.HeatExchangers.ConstantEffectiveness
Buildings.Fluid.MassExchangers.ConstantEffectiveness
Corrected error in the documentation that was not updated when the implementation of zero flow rate was revised.
Buildings.Fluid.Interfaces.ConservationEquation Corrected the syntax error Medium.ExtraProperty C[Medium.nC](each nominal=C_nominal) to Medium.ExtraProperty C[Medium.nC](nominal=C_nominal) because C_nominal is a vector. This syntax error caused a compilation error in OpenModelica.
Buildings.Fluid.Sensors.SensibleEnthalpyFlowRate
Buildings.Fluid.Sensors.LatentEnthalpyFlowRate
Buildings.Fluid.Sensors.MassFraction
Buildings.Fluid.Sensors.MassFractionTwoPort
Changed medium declaration in the extends statement to replaceable to avoid a translation error in OpenModelica.
Buildings.Fluid.Sensors.TraceSubstances
Buildings.Fluid.Sensors.TraceSubstancesTwoPort
Corrected syntax errors in setting nominal value for output signal and for state variable. This eliminates a compilation error in OpenModelica.
Buildings.Fluid.Sources.TraceSubstancesFlowSource Added missing each in declaration of C_in_internal. This eliminates a compilation error in OpenModelica.
Buildings.Utilities.Python27
Buildings.Utilities.IO.Python27.Functions.exchange Corrected error in C code that lead to message 'module' object has no attribute 'argv' when a python module accessed sys.argv.

The following issues have been fixed:

Verify mass and species balance
#165 This issue has been addressed by renaming the connectors to avoid an ambiguity in the model equation. The equations were correct.
Remove flow attribute from radiosity connectors
#158 This issue has been addressed by reformulating the radiosity models. With the new implementation, incoming and outgoing radiosity are non-negative quantities.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_5_build1 "Version 1.5 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_5_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_4_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_4_build1

Version 1.4 build 1

Information

Version 1.4 build 1 contains the new package Buildings.Utilities.IO.Python27 that allows calling Python functions from Modelica. It also contains in the package Buildings.HeatTransfer.Conduction.SingleLayer a new model for heat conduction in phase change material. This model can be used as a layer of the room heat transfer model.

Non-backward compatible changes had to be introduced in the valve models Buildings.Fluid.Actuators.Valves to fully comply with the Modelica language specification, and in the models in the package Buildings.Utilities.Diagnostics as they used the cardinality function which is deprecated in the Modelica Language Specification.

See below for details.

The following new libraries have been added:

Buildings.Utilities.IO.Python27 Package that contains blocks and functions that embed Python 2.7 in Modelica. Data can be sent to Python functions and received from Python functions. This allows for example data analysis in Python as part of a Modelica model, or data exchange as part of a hardware-in-the-loop simulation in which Python is used to communicate with hardware.

The following new components have been added to existing libraries:

Buildings.BoundaryConditions.WeatherData
Buildings.BoundaryConditions.WeatherData.BaseClasses.getAbsolutePath This function is used by the weather data reader to set the path to the weather file relative to the root directory of the Buildings library.

The following existing components have been improved in a backward compatible way:

Buildings.Fluid
Buildings.Fluid.MixingVolumes.BaseClasses.PartialMixingVolume Removed the check of multiple connections to the same element of a fluid port, as this check required the use of the deprecated cardinality function.
Buildings.HeatTransfer
Buildings.HeatTransfer.Conduction.SingleLayer Added option to model layers with phase change material.
Buildings.Rooms
Buildings.Rooms.BaseClasses.InfraredRadiationExchange Removed the use of the cardinality function as this function is deprecated in the Modelica Language Specification.

The following existing components have been improved in a non-backward compatible way:

Buildings.Fluid
Buildings.Fluid.Actuators.Valves All valves now require the declaration of dp_nominal if the parameter assignment is CvData = Buildings.Fluid.Types.CvTypes.OpPoint. This change was needed because in the previous version, dp_nominal had a default value of 6000 Pascals. However, if CvData >< Buildings.Fluid.Types.CvTypes.OpPoint, then dp_nominal is computed in the initial algorithm section and hence providing a default value is not allowed according to the Modelica Language Specification. Hence, it had to be removed.
As part of this change, we set dp(nominal=6000) for all valves, because the earlier formulation uses a value that is not known during compilation, and hence leads to an error in Dymola 2014.
Buildings.Fluid.MixingVolumes.MixingVolumeDryAir
Buildings.Fluid.MixingVolumes.MixingVolumeMoistAir
Removed the use of the deprecated cardinality function. Therefore, now all input signals must be connected..
Buildings.Utilities
Buildings.Utilities.Diagnostics.AssertEquality
Buildings.Utilities.Diagnostics.AssertInequality
Removed the option to not connect input signals, as this required the use of the cardinality function which is deprecated in the MSL, and not correctly implemented in OpenModelica. Therefore, if using these models, both input signals must be connected.
Buildings.Utilities.Math.Functions.splineDerivatives Removed the default value input Boolean ensureMonotonicity=isMonotonic(y, strict=false) as the Modelica language specification is not clear whether defaults can be computed or must be constants.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Controls
Buildings.Controls.SetPoints.HotWaterTemperatureReset Corrected error that led to wrong results if the room air temperature is different from its nominal value TRoo_nominal. This fixes issue 74.
Buildings.HeatTransfer
Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab
Buildings.Fluid.HeatExchangers.RadiantSlabs.ParallelCircuitSlab
Fixed bug in the assignment of the fictitious thermal resistance by replacing RFic[nSeg](each G=A/Rx) with RFic[nSeg](each G=A/nSeg/Rx). This fixes issue 79.
Buildings.Utilities
Buildings.Utilities.Diagnostics.AssertEquality
Buildings.Utilities.Diagnostics.AssertInequality
Replaced when test with if test as equations within a when section are only evaluated when the condition becomes true. This fixes issue 72.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.Fluid
Buildings.Fluid.Actuators.Valves.ThreeWayEqualPercentageLinear
Buildings.Fluid.Actuators.Valves.ThreeWayLinear
The documenation was Fraction Kv(port_1->port_2)/Kv(port_3->port_2) instead of Fraction Kv(port_3->port_2)/Kv(port_1->port_2). Because the parameter set correctly its attributes min=0 and max=1, instances of these models used the correct value.
Buildings.Fluid.Actuators.BaseClasses.ValveParameters Removed stray backslash in write statement.
Buildings.Fluid.Interfaces.ConservationEquation
Buildings.Fluid.Interfaces.StaticTwoPortConservationEquation
Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger
Removed wrong unit attribute of COut.
Buildings.Fluid.HeatExchangers.BaseClasses.HexElement Changed the redeclaration of vol2 to be replaceable, as vol2 is replaced in some models.

The following issues have been fixed:

Add explanation of nStaRef.
#70 Described in Buildings.HeatTransfer.Data.Solids how the parameter nStaRef is used to compute the spatial grid that is used for simulating transient heat conduction.
Assert statement does not fire.
#72 The blocks Buildings.Utilities.Diagnostics.AssertEquality and Buildings.Utilities.Diagnostics.AssertInequality did not fire because the test on the time was in a when instead of an if statement. This was wrong because when sections are only evaluated when the condition becomes true.
HotWaterTemperatureReset computes wrong results if room temperature differs from nominal value.
#74 The equation
TSup = TRoo_in_internal
          + ((TSup_nominal+TRet_nominal)/2-TRoo_in_internal) * qRel^(1/m)
          + (TSup_nominal-TRet_nominal)/2 * qRel;
should be formulated as
TSup = TRoo_in_internal
          + ((TSup_nominal+TRet_nominal)/2-TRoo_nominal) * qRel^(1/m)
          + (TSup_nominal-TRet_nominal)/2 * qRel;
Bug in RadiantSlabs.SingleCircuitSlab fictitious resistance RFic.
#79 This bug has been fixed in the assignment of the fictitious thermal resistance by replacing RFic[nSeg](each G=A/Rx) with RFic[nSeg](each G=A/nSeg/Rx). The bug also affected RadiantSlabs.ParallelCircuitSlab.

Note:

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_4_build1 "Version 1.4 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_4_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_3_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_3_build1

Version 1.3 build 1

Information

In version 1.3 build 1, models for direct evaporative cooling coils with multiple stages or with a variable speed compressor have been added. This version also contains improvements to the fan and pump models to better treat zero mass flow rate. Various other improvements have been made to improve the numerics and to use consistent variable names. A detailed list of changes is shown below.

The following new libraries have been added:

Buildings.Fluid.HeatExchangers.DXCoils Library with direct evaporative cooling coils.

The following new components have been added to existing libraries:

Buildings.Examples
Buildings.Examples.ChillerPlant.DataCenterContinuousTimeControl Added chilled water plant model with continuous time control that replaces the discrete time control in Buildings.Examples.ChillerPlant.DataCenterDiscreteTimeControl.
Buildings.Utilities
Buildings.Utilities.Psychrometrics.Functions.X_pSatpphi Function that computes moisture concentration based on saturation pressure, total pressure and relative humidity.
Buildings.Utilities.Psychrometrics.TWetBul_TDryBulPhi Block that computes the wet bulb temperature for given dry bulb temperature, relative humidity and atmospheric pressure.
Buildings.Utilities.Psychrometrics.WetBul_pTX Block that computes the temperature and mass fraction at the wet bulb state for given dry bulb temperature, species concentration and atmospheric pressure.

The following existing components have been improved in a backward compatible way:

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Added computation of the wet bulb temperature. Computing the wet bulb temperature introduces a nonlinear equation. As we have not observed an increase in computing time because of computing the wet bulb temperature, it is computed by default. By setting the parameter computeWetBulbTemperature=false, the computation of the wet bulb temperature can be removed.
Buildings.Controls
Buildings.Controls.SetPoints.OccupancySchedule Added pre operator and relaxed tolerance in assert statement.
Buildings.Fluid
Buildings.Fluid.Movers.FlowControlled_dp
Buildings.Fluid.Movers.FlowControlled_m_flow
Buildings.Fluid.Movers.SpeedControlled_Nrpm
Buildings.Fluid.Movers.SpeedControlled_y
Reformulated implementation of efficiency model to avoid a division by zero at zero mass flow rate for models in which a user specifies a power instead of an efficiency performance curve.
Buildings.Utilities
Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi Added option to approximate the wet bulb temperature using an explicit equation. Reformulated the original model to change the dimension of the nonlinear system of equations from two to one.

The following existing components have been improved in a non-backward compatible way:

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3
Buildings.BoundaryConditions.Types
Improved the optional inputs for the radiation data global horizontal, diffuse horizontal and direct normal radiation. If a user specifies two of them, the third will be automatically calculated.
Buildings.BoundaryConditions.SkyTemperature.BlackBody Renamed radHor to radHorIR to indicate that the radiation is in the infrared spectrum.
Buildings.Fluid
Buildings.Airflow.Multizone.BaseClasses.DoorDiscretized
Buildings.Airflow.Multizone.DoorDiscretizedOpen
Buildings.Airflow.Multizone.DoorDiscretizedOperable
Buildings.Airflow.Multizone.Orifice
Buildings.Airflow.Multizone.ZonalFlow_ACS
Buildings.Fluid.Actuators.BaseClasses.PartialDamperExponential
Buildings.Fluid.Actuators.Dampers.MixingBox
Buildings.Fluid.Actuators.Dampers.VAVBoxExponential
Buildings.Fluid.BaseClasses.PartialResistance
Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger
Buildings.Fluid.Movers.BaseClasses.PowerInterface
Buildings.Fluid.Storage.BaseClasses.Buoyancy
Buildings.Fluid.HeatExchangers.BaseClasses.MassExchange
Renamed protected parameters for consistency with the naming conventions. In previous releases, fluid properties had the suffix 0 or _nominal instead of _default when they where computed based on the medium default properties.
Buildings.Fluid.Sensors.SensibleEnthalpyFlowRate
Buildings.Fluid.Sensors.LatentEnthalpyFlowRate
Moved computation of parameter i_w to new base class Buildings.Fluid.BaseClasses.IndexWater The value of this parameter is now assigned dynamically and does not require to be specified by the user.
Buildings.Fluid.Storage.BaseClasses.ThirdOrderStratifier Removed unused protected parameters sta0 and cp0.
Buildings.Examples
Buildings.Examples.ChillerPlant.DataCenterDiscreteTimeControl
Buildings.Examples.ChillerPlant.BaseClasses.Controls.TrimAndRespond
Buildings.Examples.ChillerPlant.BaseClasses.Controls.ZeroOrderHold
Re-implemented the controls for setpoint reset. Revised the model TrimAndRespond and deleted the model ZeroOrderHold. Improved the documentation.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Examples
Buildings.Examples.ChillerPlant.DataCenterDiscreteTimeControl Fixed error in wet bulb temperature. The previous version used a model to compute the wet bulb temperature that takes as an input the relative humidity, but required mass fraction as an input.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3
Buildings.BoundaryConditions.SkyTemperature.BlackBody
Renamed radHor to radHorIR.
Buildings.Fluid
Buildings.Fluid.BaseClasses.FlowModels.Examples.InverseFlowFunction Fixed error in the documentation.
Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger Fixed broken link in the documentation.
Buildings.Fluid.Movers.BaseClasses.Characteristics.powerParameters Fixed wrong displayUnit and max attribute for power.
Buildings.Fluid.MixingVolumes In documentation, removed reference to the parameter use_HeatTransfer which no longer exists.
Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.Functions.glassPropertyUncoated Improved the documentation for implementation and added comments for model limitations.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_3_build1 "Version 1.3 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_3_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_2_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_2_build1

Version 1.2 build 1

Information

In version 1.2 build 1, models for radiant slabs and window overhangs and sidefins have been added. This version also contains various improvements to existing models. A detailed list of changes is shown below.

The following new libraries have been added:

Buildings.Fluid.HeatExchangers.RadiantSlabs Package with models for radiant slabs with pipes or a capillary heat exchanger embedded in the construction.
Buildings.Fluid.Data.Pipes Package with records for pipes.

The following new components have been added to existing libraries:

Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.FixedShade
Buildings.HeatTransfer.Windows.Overhang
Buildings.HeatTransfer.Windows.SideFins
For windows with either an overhang or side fins, these blocks output the fraction of the area that is sun exposed.
Buildings.Rooms
Buildings.Rooms.Examples.BESTEST Added BESTEST validation models for case 610, 620, 630, 640, 650FF, 650, 920, 940, 950FF, 950, and 960.

The following existing components have been improved in a backward compatible way:

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Removed assignment of HGloHor_in in its declaration, because this gives an overdetermined system if the input connector is used.
Added new sub-bus that contains the solar position. This allows reusing the solar position in various other models.
Buildings.BoundaryConditions.SolarIrradiation.DiffuseIsotropic
Buildings.BoundaryConditions.SolarIrradiation.DiffusePerez
Buildings.BoundaryConditions.SolarIrradiation.BaseClasses.DiffuseIsotropic
Buildings.BoundaryConditions.SolarIrradiation.BaseClasses.DiffusePerez
Added optional output of diffuse radiation from the sky and ground. This allows reusing the diffuse radiation in solar thermal collector.
Buildings.BoundaryConditions.SolarGeometry.BaseClasses.SolarAzimuth Changed implementation to avoid an event at solar noon.
Buildings.HeatTransfer
Buildings.HeatTransfer.Data.BoreholeFillings Renamed class to BoreholeFillings to be consistent with data records being plural.
Buildings.Media
Buildings.Media.GasesPTDecoupled.MoistAir
Buildings.Media.Air
Buildings.Media.PerfectGases.MoistAir
Buildings.Media.PerfectGases.MoistAirUnsaturated
Buildings.Media.GasesConstantDensity.MoistAir
Buildings.Media.GasesConstantDensity.MoistAirUnsaturated
Added redeclaration of ThermodynamicState to avoid a warning during model check and translation.
Buildings.Rooms
Buildings.Rooms.MixedAir Added a check that ensures that the number of surfaces are equal to the length of the parameter that contains the surface area, and added a check to ensure that no surface area is equal to zero. These checks help detecting erroneous declarations of the room model. The changes were done in Buildings.Rooms.MixedAir.PartialSurfaceInterface.

The following existing components have been improved in a non-backward compatible way:

Buildings.Rooms
Buildings.Rooms.MixedAir Added optional modeling of window overhangs and side fins. The modeling of window overhangs and side fins required the introduction of the new parameters hWin for the window height and wWin for the window width, in addition to the parameters ove and sidFin which are used to declare the geometry of overhangs and side fins. The parameters hWin and wWin replace the previously used parameter AWin for the window area. Users need to manually replace AWin with hWin and wWin when updating models from a previous version of the library.
See the information section in Buildings.Rooms.MixedAir for how to use these models.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Controls
Buildings.Controls.SetPoints.OccupancySchedule Fixed a bug that caused an error in the schedule if the simulation start time was negative or equal to the first entry in the schedule.
Buildings.Fluid
Buildings.Fluid.Storage.BaseClass.ThirdOrderStratifier Revised the implementation to reduce the temperature overshoot.
Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.BaseClasses.GlassLayer Fixed the bug in the temperature linearization and in the heat flow through the glass layer if the transmissivity of glass in the infrared regime is non-zero.
Buildings.HeatTransfer.Windows.BaseClasses.CenterOfGlass Fixed a bug in the parameter assignment of the instance glass. Previously, the infrared emissivity of surface a was assigned to the surface b.
Buildings.Utilities
Buildings.Utilities.IO.BCVTB Added a call to Buildings.Utilities.IO.BCVTB.BaseClasses.exchangeReals in the initial algorithm section. This is needed to propagate the initial condition to the server. It also leads to one more data exchange, which is correct and avoids the warning message in Ptolemy that says that the simulation reached its stop time one time step prior to the final time.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 Corrected the documentation of the unit requirement for input files, parameters and connectors.
Buildings.Fluid
Buildings.Fluid.Interfaces.PartialFourPortInterface
Buildings.Fluid.Interfaces.PartialTwoPortInterface
Replaced the erroneous function call Medium.density with Medium1.density and Medium2.density in PartialFourPortInterface. Changed condition to remove sta_a1 and sta_a2 in PartialFourPortInterface, and sta_a in PartialTwoPortInterface, to also compute the state at the inlet port if show_V_flow=true.
The previous implementation resulted in a translation error if show_V_flow=true, but worked correctly otherwise because the erroneous function call is removed if show_V_flow=false.
Buildings.Fluid.Chillers.Examples.BaseClasses.PartialElectric Corrected the nominal mass flow rate used in the mass flow source.

The following issues have been fixed:

Heat transfer in glass layer
#56 Fixed bug in heat flow through the glass layer if the infrared transmissivity is non-zero.
#57 Fixed bug in temperature linearization of window glass.
Overshooting in enhanced stratified tank
#15 Revised the implementation to reduce the temperature over-shoot.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_2_build1 "Version 1.2 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_2_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_1_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_1_build1

Version 1.1 build 1

Information

Version 1.1 build 1 contains improvements to models that address numerical problems. In particular, flow machines and actuators now have an optional filter that converts step changes in the input signal to a smooth change in speed or actuator position. Also, ( Buildings.Examples.Tutorial) has been added to provide step-by-step instruction for how to build system models.

The following new libraries have been added:

Buildings.Examples.Tutorial Tutorial with step by step instructions for how to build system models.

The following new components have been added to existing libraries:

Buildings.Fluid
Buildings.Fluid.FixedResistances.Pipe Added a model for a pipe with transport delay and optional heat exchange with the environment.
Buildings.Fluid.Actuators.UsersGuide Added a user's guide for actuator models.
Buildings.Fluid.Interfaces.ConservationEquation
Buildings.Fluid.Interfaces.StaticConservationEquation
These base classes have been added to simplify the implementation of dynamic and steady-state thermofluid models.
Buildings.Fluid.Data.Fuels Package with physical properties of fuels that are used by the boiler model.

The following existing components have been improved in a backward compatible way:

Buildings.Fluid
Buildings.Fluid.Actuators.Dampers.Exponential
Buildings.Fluid.Actuators.Dampers.VAVBoxExponential
Buildings.Fluid.Actuators.Dampers.MixingBox
Buildings.Fluid.Actuators.Dampers.MixingBoxMinimumFlow
Buildings.Fluid.Actuators.Valves.ThreeWayEqualPercentageLinear
Buildings.Fluid.Actuators.Valves.ThreeWayLinear
Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage
Buildings.Fluid.Actuators.Valves.TwoWayLinear
Buildings.Fluid.Actuators.Valves.TwoWayQuickOpening
Added an optional 2nd order lowpass filter for the input signal. The filter approximates the travel time of the actuators. It also makes the system of equations easier to solve because a step change in the input signal causes a gradual change in the actuator position.
Note that this filter affects the time response of closed loop control. Therefore, enabling the filter may require retuning of control loops. See the user's guide of the Buildings.Fluid.Actuators package.
Buildings.Fluid.Boilers.BoilerPolynomial Added computation of fuel usage and improved the documentation.
Buildings.Fluid.Movers.SpeedControlled_y
Buildings.Fluid.Movers.SpeedControlled_Nrpm
Buildings.Fluid.Movers.FlowControlled_dp
Buildings.Fluid.Movers.FlowControlled_m_flow
Added a 2nd order lowpass filter to the input signal. The filter approximates the startup and shutdown transients of fans or pumps. It also makes the system of equations easier to solve because a step change in the input signal causes a gradual change in the mass flow rate.
Note that this filter affects the time response of closed loop control. Therefore, enabling the filter may require retuning of control loops. See the user's guide of the Buildings.Fluid.Movers package.
Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger Changed model to use graphical implementation of models for pressure drop and conservation equations.
Buildings.Fluid.BaseClasses.PartialResistance
Buildings.Fluid.FixedResistances.FixedResistanceDpM
Buildings.Fluid.Actuators.BaseClasses.PartialTwoWayValve
Buildings.Fluid.Actuators.BaseClasses.PartialDamperExponential
Revised base classes and models to simplify object inheritance tree. Set m_flow_small to final in Buildings.Fluid.BaseClasses.PartialResistance, and removed its assignment in the other classes.
Buildings.Fluid.FixedResistances.FixedResistanceDpM
Buildings.Fluid.FixedResistances.SplitterFixedResistanceDpM
Improved documentation.
Buildings.HeatTransfer
Buildings.HeatTransfer.Windows.Functions.glassProperty Added the function glassPropertyUncoated that calculates the property for uncoated glass.
Buildings.Rooms
Buildings.Rooms.MixedAir Changed model to use new implementation of Buildings.HeatTransfer.Radiosity.OutdoorRadiosity in its base classes. This change leads to the use of the same equations for the radiative heat transfer between window and ambient as is used for the opaque constructions.

The following existing components have been improved in a non-backward compatible way:

Buildings.Fluid
Buildings.Fluid.Actuators.Valves.ThreeWayEqualPercentageLinear
Buildings.Fluid.Actuators.Valves.ThreeWayLinear
Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage
Buildings.Fluid.Actuators.Valves.TwoWayLinear
Buildings.Fluid.Actuators.Valves.TwoWayQuickOpening
Changed models to allow modeling of a fixed resistance that is within the controlled flow leg. This allows in some cases to avoid a nonlinear equation if a flow resistance is in series to the valve. This change required changing the parameter for the valve resistance dp_nominal to dpValve_nominal, and introducing the parameter dpFixed_nominal, with dpFixed_nominal=0 as its default value. Previous models that instantiate these components need to change the assignment of dp_nominal to an assignment of dpValve_nominal. See also Buildings.Fluid.Actuators.UsersGuide.
Buildings.HeatTransfer
Buildings.HeatTransfer.Radiosity.OutdoorRadiosity
Buildings.HeatTransfer.Windows.ExteriorHeatTransfer
Changed model to use new implementation of Buildings.HeatTransfer.Radiosity.OutdoorRadiosity. This change leads to the use of the same equations for the radiative heat transfer between window and ambient as is used for the opaque constructions.
Buildings.Controls
Buildings.Controls.SetPoints.OccupancySchedule Changed model to fix a bug that caused the output of the block to be incorrect when the simulation started at a time different from zero. When fixing this bug, the parameter startTime was removed, and the parameter endTime was renamed to period. The period always starts at t=0 seconds.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.Controls
Buildings.Controls.SetPoints.OccupancySchedule The output of the block was incorrect when the simulation started at a time different from zero.
Buildings.Fluid.HeatExchangers
Buildings.Fluid.HeatExchangers.DryCoilCounterFlow
Buildings.Fluid.HeatExchangers.WetCoilCounterFlow
Corrected error in assignment of dp2_nominal. The previous assignment caused a pressure drop in all except one element, instead of the opposite. This caused too high a flow resistance of the heat exchanger.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, e.g., units are wrong or errors in documentation):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.SkyTemperature.BlackBody Fixed error in BlackBody model that was causing a translation error when calTSky was set to Buildings.BoundaryConditions.Types.SkyTemperatureCalculation.HorizontalRadiation.
Buildings.Fluid
Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger Fixed wrong class reference in information section.
Buildings.Utilities
Buildings.Utilities.IO.BCVTB.Examples.MoistAir Updated fan parameters, which were still for version 0.12 of the Buildings library and hence caused a translation error with version 1.0 or higher.

The following issues have been fixed:

Exterior longwave radiation exchange in window model
#51 Changed model to use new implementation of Buildings.HeatTransfer.Radiosity.OutdoorRadiosity. This change leads to the use of the same equations for the radiative heat transfer between window and ambient as is used for the opaque constructions.
#53 Fixed bug in Buildings.Controls.SetPoints.OccupancySchedule that led to wrong results when the simulation started at a time different from zero.

Note:

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_1_build1 "Version 1.1 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_1_build1;

Buildings.UsersGuide.ReleaseNotes.Version_1_0_build2 Buildings.UsersGuide.ReleaseNotes.Version_1_0_build2

Version 1.0 build 2

Information

Version 1.0 build 2 has been released to correct model errors that were present in version 1.0 build 1. Both versions are compatible. In addition, version 1.0 build 2 contains improved documentation of various example models.

The following existing components have been improved in a backward compatible way:

Buildings.Controls
Buildings.Controls.Continuous
Buildings.Controls.Discrete
Buildings.Controls.SetPoints
Improved documentation of models and of examples.
Buildings.Airflow.Multizone
Buildings.Airflow.Multizone.DoorDiscretizedOpen
Buildings.Airflow.Multizone.DoorDiscretizedOperable
Changed the computation of the discharge coefficient to use the nominal density instead of the actual density. Computing sqrt(2/rho) sometimes causes warnings from the solver, as it seems to try negative values for the density during iterative solutions.
Buildings.Airflow.Multizone.Examples Improved documentation of examples.
Buildings.Examples.DualFanDualDuct
Buildings.Examples.DualFanDualDuct.Controls.RoomMixingBox Improved control of minimum air flow rate to avoid overheating.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.HeatTransfer
Buildings.HeatTransfer.Convection.Exterior Fixed error in assignment of wind-based convection coefficient. The old implementation did not take into account the surface roughness.
Buildings.Rooms
Buildings.Rooms.BaseClasses.SolarRadiationExchange In the previous version, the radiative properties of the long-wave spectrum instead of the solar spectrum have been used to compute the distribution of the solar radiation among the surfaces inside the room.
Buildings.Rooms.BaseClasses.MixedAir Added missing connect statement between window frame surface and window frame convection model. Prior to this bug fix, no convective heat transfer was computed between window frame and room air.
Buildings.Rooms.BaseClasses.HeatGain Fixed bug that caused convective heat gains to be removed from the room instead of added to the room.

The following issues have been fixed:

Buildings.Fluid.HeatExchangers.Boreholes
#45 Dymola 2012 FD01 hangs when simulating a borehole heat exchanger. This was caused by a wrong release of memory in freeArray.c.
Buildings.Rooms
#46 The convective internal heat gain has the wrong sign.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_0_build2 "Version 1.0 build 2" extends Modelica.Icons.ReleaseNotes; end Version_1_0_build2;

Buildings.UsersGuide.ReleaseNotes.Version_1_0_build1 Buildings.UsersGuide.ReleaseNotes.Version_1_0_build1

Version 1.0 build 1

Information

Version 1.0 is the first official release of the Buildings library. Compared to the last pre-release, which is version 0.12, this version contains new models as well as significant improvements to the model formulation that leads to faster and more robust simulation. A detailed list of changes is shown below.

Version 1.0 is not backward compatible to version 0.12, i.e., models developed with versions 0.12 will require some changes in their parameters to work with version 1.0. The conversion script Buildings/Resources/Scripts/Dymola/ConvertBuildings_from_0.12_to_1.0.mos can help in converting old models to this version of the library.

The following new libraries have been added:

Buildings.Fluid.HeatExchangers.Boreholes This is a library with a model for a borehole heat exchanger.

The following new components have been added to existing libraries:

Buildings.Airflow.Multizone
Buildings.Airflow.Multizone.BaseClasses.windPressureLowRise Added a function that computes wind pressure on the facade of low-rise buildings.
Buildings.Examples
Buildings.Examples.ChillerPlant Added an example for a chilled water plant model.
Buildings.Fluid.Interfaces
Buildings.Fluid.Interfaces.UsersGuide Added a user's guide that describes the main functionality of all base classes.
Buildings.Fluid.Sources
Buildings.Fluid.Sources.Outside_Cp
Buildings.Fluid.Sources.Outside_CpLowRise
Added models to compute wind pressure on building facades.
Buildings.HeatTransfer
Buildings.HeatTransfer.Conductor Added a model for heat conduction in circular coordinates.
Buildings.Rooms.Examples
Buildings.Rooms.Examples.BESTEST Added BESTEST validation models.
Buildings.Utilities.Math
Buildings.Utilities.Math.Functions.cubicHermiteLinearExtrapolation
Buildings.Utilities.Math.Functions.splineDerivatives.
Added functions for cubic hermite spline interpolation, with option for monotone increasing (or decreasing) spline.

The following existing components have been improved in a backward compatible way:

Buildings.Airflow.Multizone
Buildings.Airflow.Multizone.BaseClasses.powerLaw This function has been reimplemented to handle zero flow rate in a more robust and more efficient way. This change improves all components that model flow resistance in the package Buildings.Airflow.Multizone.
Buildings.BoundaryConditions.WeatherData
Buildings.BoundaryConditions.WeatherData.ReaderTMY3 This model has now the option of using a constant value, using the data from the weather file, or from an input connector for 7 variables, including atmospheric pressure, relative humidity, dry bulb temperature, global horizontal radiation, diffuse horizontal radiation, wind direction and wind speed.
Buildings.Fluid
Buildings.Fluid.Actuators.BaseClasses.PartialActuator
Buildings.Fluid.Actuators.BaseClasses.PartialDamperExponential
Buildings.Fluid.Actuators.BaseClasses.PartialTwoWayValve
Buildings.Fluid.BaseClasses.PartialResistance
Buildings.Fluid.BaseClasses.FlowModels.basicFlowFunction_dp
Buildings.Fluid.BaseClasses.FlowModels.basicFlowFunction_m_flow
Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger
The computation of the linearized flow resistance has been moved from the functions to the model, i.e., into an equation section. If the linear implementation is in a function body, then a symbolic processor may not invert the equation. This can lead to systems of coupled equations in cases where an explicit solution is possible. In addition, the handling of zero flow rate has been improved for the nonlinear pressure drop model. These improvements affect all models in Buildings.Fluid that compute flow resistance.
Buildings.Fluid.HeatExchangers
Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed This model can now be configured as a steady-state or dynamic model.
Buildings.Fluid.HeatExchangers.DryCoilCounterFlow
Buildings.Fluid.HeatExchangers.WetCoilCounterFlow
Buildings.Fluid.HeatExchangers.DryCoilDiscretized
Buildings.Fluid.HeatExchangers.WetCoilDiscretized
The implementation for handling zero flow rate, if the models are used as steady-state models, have been improved.
Buildings.Fluid.HeatExchangers.BaseClasses.ntu_epsilonZ Changed implementation to use Modelica.Media.Common.OneNonLinearEquation instead of Buildings.Utilities.Math.BaseClasses.OneNonLinearEquation, which was removed for this version of the library.
Buildings.Fluid.HeatExchangers.CoolingTowers
Buildings.Fluid.HeatExchangers.CoolingTowers.YorkCalc
Buildings.Fluid.HeatExchangers.CoolingTowers.FixedApproach
These models are now based on a new base class Buildings.Fluid.HeatExchangers.CoolingTowers.BaseClasses.CoolingTower. This allows using the models as replaceable models without warning when checking the model.
Buildings.Fluid.HeatExchangers.CoolingTowers.YorkCalc Changed implementation of performance curve to avoid division by zero.
Buildings.Fluid.MassExchangers
Buildings.Fluid.MassExchangers.HumidifierPrescribed This model can now be configured as a steady-state or dynamic model.
Buildings.Fluid.Sensors
Buildings.Fluid.Sensors.*TwoPort All sensors with two ports, except for the mass flow rate sensor, have been revised to add sensor dynamics. Adding sensor dynamics avoids numerical problems when mass flow rates are close to zero and the sensor is configured to allow flow reversal. See Buildings.Fluid.Sensors.UsersGuide for details.
Buildings.Fluid.Storage
Buildings.Fluid.Storage.Stratified
Buildings.Fluid.Storage.StratifiedEnhanced
Changed the implementation of the model Buoyancy to make it differentiable in the temperatures.
Buildings.Media
Buildings.Media.Interfaces.PartialSimpleMedium
Buildings.Media.Interfaces.PartialSimpleIdealGasMedium
Moved the assignment of the stateSelect attribute for the BaseProperties to the model Buildings.Fluid.MixingVolumes.MixingVolume. This allows to handle it differently for steady-state and dynamic models.
Buildings.Utilities.Psychrometrics
Buildings.Utilities.Psychrometrics.Functions.TDewPoi_pW Changed implementation to use Modelica.Media.Common.OneNonLinearEquation instead of Buildings.Utilities.Math.BaseClasses.OneNonLinearEquation, which was removed for this version of the library.

The following existing components have been improved in a non-backward compatible way:

Buildings.Airflow.Multizone
Buildings.Airflow.Multizone.MediumColumnDynamic The implementation has been changed to better handle mass flow rates near zero flow. This required the introduction of a new parameter m_flow_nominal that is used for the regularization near zero mass flow rate.
Buildings.Fluid
Buildings.Fluid.Storage.Examples.Stratified
Buildings.Fluid.MixingVolumes
Removed the parameters use_T_start and h_start, as T_start is more convenient to use than h_start for building simulation.
Buildings.Fluid.Boilers
Buildings.Fluid.Boilers.BoilerPolynomial The parameter dT_nominal has been removed as it can be computed from the parameter m_flow_nominal. This change was needed to avoid a non-literal value for the nominal attribute for the mass flow rate in the pressure drop model.
Buildings.Fluid.MixingVolumes
Buildings.Fluid.MixingVolumes.MixingVolume
Buildings.Fluid.MixingVolumes.MixingVolumeDryAir
Buildings.Fluid.MixingVolumes.MixingVolumeMoistAir
The implementation has been changed to better handle mass flow rates near zero flow if the components have exactly two fluid ports connected. This required the introduction of a new parameter m_flow_nominal that is used for the regularization near zero mass flow rate.
Buildings.Fluid.Movers
Buildings.Fluid.Movers.SpeedControlled_y
Buildings.Fluid.Movers.SpeedControlled_Nrpm
Buildings.Fluid.Movers.FlowControlled_dp
Buildings.Fluid.Movers.FlowControlled_m_flow
The performance data are now defined through records and not through replaceable functions. The performance data now needs to be declared in the form
 pressure(V_flow_nominal={0,V_flow_nominal,2*V_flow_nominal},
          dp_nominal={2*dp_nominal,dp_nominal,0})
where pressure is an instance of a record. A similar declaration is used for power and efficiency.
The parameter m_flow_nominal has been removed from FlowMachine_y and FlowMachine_Nrpm.
The parameter m_flow_max has been replaced by m_flow_nominal in FlowMachine_m_flow.
The implementation of the pressure drop computation as a function of speed and volume flow rate has been revised to avoid a singularity near zero volume flow rate and zero speed.
The implementation has also been simplified to avoid using two different flow paths if the models are configured for steady-state or dynamic simulation.
Buildings.Fluid.Interfaces
Buildings.Fluid.Interfaces.FourPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialDynamicStaticFourPortHeatMassExchanger
Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialDynamicStaticTwoPortHeatMassExchanger
Buildings.Fluid.Interfaces.ConservationEquation
The implementation has been changed to better handle mass flow rates near zero flow if the components have exactly two fluid ports connected.
Buildings.Fluid.Sensors
Buildings.Fluid.Sensors.TemperatureTwoPortDynamic This model has been deleted since the sensor Buildings.Fluid.Sensors.TemperatureTwoPort has been revised and can now also be used as a dynamic model of a sensor.
Buildings.Fluid.Interfaces
Buildings.Fluid.Interfaces.PartialStaticTwoPortInterface Renamed to Buildings.Fluid.Interfaces.PartialTwoPortInterface
Buildings.Fluid.Interfaces.PartialStaticStaticTwoPortHeatMassExchanger Renamed to Buildings.Fluid.Interfaces.StaticTwoPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialTwoPortHeatMassExchanger Renamed to Buildings.Fluid.Interfaces.TwoPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialFourPort Renamed to Buildings.Fluid.Interfaces.FourPort
Buildings.Fluid.Interfaces.PartialStaticStaticFourPortHeatMassExchanger Renamed to Buildings.Fluid.Interfaces.StaticFourPortHeatMassExchanger
Buildings.Fluid.Interfaces.PartialStaticFourPortInterface Renamed to Buildings.Fluid.Interfaces.PartialFourPortInterface
Buildings.Fluid.Interfaces.PartialFourPortHeatMassExchanger Renamed to Buildings.Fluid.Interfaces.FourPortHeatMassExchanger
Buildings.Utilities.Math
Buildings.Utilities.Math.BaseClasses.OneNonLinearEquation This package has been removed, and all functions have been revised to use Modelica.Media.Common.OneNonLinearEquation.
Buildings.Utilities.Reports
Buildings.Utilities.Reports.Printer
Buildings.Utilities.Reports.printRealArray
Changed parameter precision to significantDigits and minimumWidth to minimumLength to use the same terminology as the Modelica Standard Library.

The following critical errors have been fixed (i.e., errors that can lead to wrong simulation results):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.SkyTemperature.BlackBody Fixed error in if-then statement that led to a selection of the wrong branch to compute the sky temperature.
Buildings.Media
Buildings.Media.PartialSimpleMedium
Buildings.Media.GasesConstantDensity.SimpleAir
Fixed error in assignment of singleState parameter. This change can lead to different initial conditions if the density of water is modeled as a function of pressure, or if the medium model Buildings.Media.GasesConstantDensity.SimpleAir is used.
Buildings.Media.GasesConstantDensity
Buildings.Media.GasesConstantDensity.MoistAir
Buildings.Media.GasesConstantDensity.MoistAirUnsaturated
Buildings.Media.GasesConstantDensity.SimpleAir
Fixed error in the function density which returned a non-constant density, and added a call to ModelicaError(...) in setState_dTX since this function cannot assign the medium pressure based on the density (as density is a constant in this model).
Buildings.Media.Interfaces.PartialSimpleIdealGasMedium Updated package with a new copy from the Modelica Standard Library, since the Modelica Standard Library fixed a bug in computing the internal energy of the medium. This bug led to very fast temperature transients at the start of the simulation.
Buildings.Media.Interfaces.PartialSimpleMedium Fixed bug in function density, which always returned d_const, regardless of the value of constantDensity.
Buildings.Media.GasesPTDecoupled Fixed bug in u=h-R*T, which is only valid for ideal gases. For this medium, the function is u=h-pStd/dStp.
Buildings.Media.GasesConstantDensity Fixed bug in u=h-R*T, which is only valid for ideal gases. For this medium, the function is u=h-p/dStp.
Buildings.Rooms
Buildings.Rooms.MixedAir
Buildings.Rooms.BaseClasses.ExteriorBoundaryConditions
Fixed bug (issue 35) that leads to the wrong solar heat gain for roofs and for floors. Prior to this bug fix, the outside facing surface of a ceiling received solar irradiation as if it were a floor and vice versa.
Buildings.Rooms.MixedAir
Buildings.Rooms.BaseClasses.ExteriorBoundaryConditionsWithWindow
Fixed bug (issue 36) that leads to too high a surface temperature of the window frame when it receives solar radiation. The previous version did not compute the infrared radiation exchange between the window frame and the sky.

The following uncritical errors have been fixed (i.e., errors that do not lead to wrong simulation results, but, e.g., units are wrong or errors in documentation):

Buildings.BoundaryConditions
Buildings.BoundaryConditions.WeatherData.BaseClasses.ConvertRadiation Corrected wrong unit label.

The following issues have been fixed:

Buildings.BoundaryConditions
#8 Add switches for new data.
#19 Shift the time for the radiation data 30 min forth and output the local civil time in the data reader.
#41 Using when-then sentences to reduce CPU time.
#43 Add a ConvertRadiation to convert the unit of radiation from TMY3.
Buildings.Fluid
#28 Move scripts to Buildings\Resources\Scripts\Dymola.
Buildings.HeatTransfer
#18 Add a smooth interpolation function to avoid the event.
Buildings.Media
#30 Removed non-required structurally incomplete annotation.
Buildings.Rooms
#35 Wrong surface tilt for radiation at exterior surfaces of floors and ceilings.
#36 High window frame temperatures.

Note:

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_1_0_build1 "Version 1.0 build 1" extends Modelica.Icons.ReleaseNotes; end Version_1_0_build1;

Buildings.UsersGuide.ReleaseNotes.Version_0_12_0 Buildings.UsersGuide.ReleaseNotes.Version_0_12_0

Version 0.12.0

Information

Note: The packages whose name ends with Beta are still being validated.

The following critical error has been fixed (i.e. error that can lead to wrong simulation results):

Buildings.Rooms
Buildings.Rooms.BaseClasses.InfraredRadiationExchange The model Buildings.Rooms.BaseClasses.InfraredRadiationExchange had an error in the view factor approximation. The error caused too much radiosity to flow from large to small surfaces because the law of reciprocity for view factors was not satisfied. This led to low surface temperatures if a surface had a large area compared to other surfaces. The bug has been fixed by rewriting the view factor calculation.

The following improvements and additions have been made:

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_12_0 "Version 0.12.0" extends Modelica.Icons.ReleaseNotes; end Version_0_12_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_11_0 Buildings.UsersGuide.ReleaseNotes.Version_0_11_0

Version 0.11.0

Information

Note: The packages whose name ends with Beta are still being validated.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_11_0 "Version 0.11.0" extends Modelica.Icons.ReleaseNotes; end Version_0_11_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_10_0 Buildings.UsersGuide.ReleaseNotes.Version_0_10_0

Version 0.10.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_10_0 "Version 0.10.0" extends Modelica.Icons.ReleaseNotes; end Version_0_10_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_9_1 Buildings.UsersGuide.ReleaseNotes.Version_0_9_1

Version 0.9.1

Information

The following critical error has been fixed (i.e. error that can lead to wrong simulation results):

Buildings.Fluid.Storage.
Buildings.Fluid.Storage.StratifiedEnhanced The model Buildings.Fluid.Storage.BaseClasses.Stratifier had a sign error that lead to a wrong energy balance. The model that was affected by this error is Buildings.Fluid.Storage.StratifiedEnhanced. The model Buildings.Fluid.Storage.Stratified was not affected.
The bug has been fixed by using the newly introduced model Buildings.Fluid.Storage.BaseClasses.ThirdOrderStratifier. This model uses a third-order upwind scheme to reduce the numerical dissipation instead of the correction term that was used in Buildings.Fluid.Storage.BaseClasses.Stratifier. The model Buildings.Fluid.Storage.BaseClasses.Stratifier has been removed since it also led to significant overshoot in temperatures when the stratification was pronounced.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_9_1 "Version 0.9.1" extends Modelica.Icons.ReleaseNotes; end Version_0_9_1;

Buildings.UsersGuide.ReleaseNotes.Version_0_9_0 Buildings.UsersGuide.ReleaseNotes.Version_0_9_0

Version 0.9.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_9_0 "Version 0.9.0" extends Modelica.Icons.ReleaseNotes; end Version_0_9_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_8_0 Buildings.UsersGuide.ReleaseNotes.Version_0_8_0

Version 0.8.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_8_0 "Version 0.8.0" extends Modelica.Icons.ReleaseNotes; end Version_0_8_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_7_0 Buildings.UsersGuide.ReleaseNotes.Version_0_7_0

Version 0.7.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_7_0 "Version 0.7.0" extends Modelica.Icons.ReleaseNotes; end Version_0_7_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_6_0 Buildings.UsersGuide.ReleaseNotes.Version_0_6_0

Version 0.6.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_6_0 "Version 0.6.0" extends Modelica.Icons.ReleaseNotes; end Version_0_6_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_5_0 Buildings.UsersGuide.ReleaseNotes.Version_0_5_0

Version 0.5.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_5_0 "Version 0.5.0" extends Modelica.Icons.ReleaseNotes; end Version_0_5_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_4_0 Buildings.UsersGuide.ReleaseNotes.Version_0_4_0

Version 0.4.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_4_0 "Version 0.4.0" extends Modelica.Icons.ReleaseNotes; end Version_0_4_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_3_0 Buildings.UsersGuide.ReleaseNotes.Version_0_3_0

Version 0.3.0

Information

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_3_0 "Version 0.3.0" extends Modelica.Icons.ReleaseNotes; end Version_0_3_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_2_0 Buildings.UsersGuide.ReleaseNotes.Version_0_2_0

Version 0.2.0

Information

New in this version are models for two and three way valves. In addition, the Fluids package has been slightly revised. The package Fluid.BaseClasses has been added because in the previous version, partial models for fixed resistances where part of the Actuator package.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_2_0 "Version 0.2.0" extends Modelica.Icons.ReleaseNotes; end Version_0_2_0;

Buildings.UsersGuide.ReleaseNotes.Version_0_1_0 Buildings.UsersGuide.ReleaseNotes.Version_0_1_0

Version 0.1.0

Information

First release of the library.

This version contains basic models for modeling building HVAC systems. It also contains new medium models in the package Buildings.Media. These medium models have simpler property functions than the ones from Modelica.Media. For example, there is medium model with constant heat capacity which is often sufficiently accurate for building HVAC simulation, in contrast to the more detailed models from Modelica.Media that are valid in a larger temperature range, at the expense of introducing non-linearities due to the medium properties.

Extends from Modelica.Icons.ReleaseNotes (Icon for release notes in documentation).

Modelica definition

class Version_0_1_0 "Version 0.1.0" extends Modelica.Icons.ReleaseNotes; end Version_0_1_0;

Automatically generated Mon May 4 10:18:07 2015.