Buildings.Fluid.FMI.ExportContainers.Validation

Collection of validation models

Information

This package contains validation models for the classes in Buildings.Fluid.FMI.ExportContainers.

Note that most validation models contain simple input data which may not be realistic, but for which the correct output can be obtained through an analytic solution. The examples plot various outputs, which have been verified against these solutions. These model outputs are stored as reference data and used for continuous validation whenever models in the library change.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
RoomHVAC	Validation model for connected single thermal zone and HVAC system
FMUs	Collection of validation models for FMU export

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC

Validation model for connected single thermal zone and HVAC system

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC

Information

This example validates the coupling of convective thermal zones with air-based HVAC systems. The model has the following three parts:

The block baseCase is the base case model, which is adapted from Buildings.Examples.Tutorial.SpaceCooling.System3 to have the same flow resistances as the models that are here validated.
The blocks hvaCon and rooCon are FMU containers that contain an HVAC system for a single zone, and a thermal model of a single zone. Both models have the same configuration as baseCase, but they are implemented such that the HVAC system and the thermal zone are in separate blocks. These blocks could be exported as an FMU, but here they are connected to each other to validate whether they indeed give the same response as the base case baseCase.
The blocks hvaCon2 and rooCon2 are again containers for HVAC and room models, but the models that they encapsulate are an HVAC system that serves two rooms, and a model of two thermal zones. Hence, this case tests whether the FMU containers for multiple HVAC systems, and for multiple thermal zones, are implemented correctly.

When the model is simulated, one sees that the air temperatures and the water vapor mass fraction in all four room models are the same. Note, however, that in Dymola 2017, the base case basCas reaches in the last cooling cylce of the day not quite the set point, and hence switches the cooling on time less than the other models. We attribute this to numerical approximation errors that causes a slightly different temperature trajectory. With Dymola 2017, we obtain the trajectories shown below.

Simulation results

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model RoomHVAC "Validation model for connected single thermal zone and HVAC system" extends Modelica.Icons.Example; Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.HVACZone hvaCon(redeclare Buildings.Fluid.HeatExchangers.WetCoilCounterFlow cooCoi( UA_nominal=-hvaCon.QCoiC_flow_nominal/ Buildings.Fluid.HeatExchangers.BaseClasses.lmtd( T_a1=hvaCon.THeaRecLvg, T_b1=hvaCon.TASup_nominal, T_a2=hvaCon.TWSup_nominal, T_b2=hvaCon.TWRet_nominal), dp1_nominal=6000, dp2_nominal=200, show_T=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, allowFlowReversal1=hvaCon.allowFlowReversal, allowFlowReversal2=hvaCon.allowFlowReversal)) "Block that encapsulates the HVAC system"; Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZone rooCon "Block that encapsulates the thermal zone"; BaseCase baseCase; Examples.FMUs.HVACZones hvaCon2( redeclare Buildings.Fluid.HeatExchangers.WetCoilCounterFlow cooCoi( UA_nominal=-hvaCon2.QCoiC_flow_nominal/ Buildings.Fluid.HeatExchangers.BaseClasses.lmtd( T_a1=hvaCon2.THeaRecLvg, T_b1=hvaCon2.TASup_nominal, T_a2=hvaCon2.TWSup_nominal, T_b2=hvaCon2.TWRet_nominal), dp1_nominal=6000, dp2_nominal=200, show_T=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, allowFlowReversal1=hvaCon2.allowFlowReversal, allowFlowReversal2=hvaCon2.allowFlowReversal), UA=20E3, QRooInt_flow=2000, fan2(constantMassFlowRate=0)) "Block that encapsulates the HVAC system"; TwoRooms rooCon2 "Model with two rooms"; protected model BaseCase "Base case model used for the validation of the FMI interfaces" extends Buildings.Examples.Tutorial.SpaceCooling.System3( vol(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial), fan(nominalValuesDefineDefaultPressureCurve=true), hex(dp1_nominal=200 + 10, dp2_nominal=200 + 200)); end BaseCase; model TwoRooms "Model with two simple thermal zones, each having three air flow paths" extends Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZones; end TwoRooms; equation connect(hvaCon.fluPor, rooCon.fluPor); connect(hvaCon2.fluPor, rooCon2.fluPor); connect(rooCon.TRad, hvaCon.TRadZon); connect(rooCon2.TRad1, hvaCon2.TRadZon[1]); connect(rooCon2.TRad2, hvaCon2.TRadZon[2]); end RoomHVAC;

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC.BaseCase

Base case model used for the validation of the FMI interfaces

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC.BaseCase

Information

This example is the base case model which is used to validate the coupling of a convective thermal zone with an air-based HVAC system.

It is based on Buildings.Examples.Tutorial.SpaceCooling.System3, and it assign some parameters to have the same configuration as Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.HVACZone.

The model which is validated using this model is Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC .

Extends from Buildings.Examples.Tutorial.SpaceCooling.System3 (Third part of the system model with air supply and closed loop control).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium for air
replaceable package MediumW		Water	Medium for water
Volume	V	6103	Room volume [m3]
Real	eps	0.8	Heat recovery effectiveness
Temperature	TASup_nominal	273.15 + 18	Nominal air temperature supplied to room [K]
Temperature	TRooSet	273.15 + 24	Nominal room air temperature [K]
Temperature	TOut_nominal	273.15 + 30	Design outlet air temperature [K]
Temperature	THeaRecLvg	TOut_nominal - eps*(TOut_nom...	Air temperature leaving the heat recovery [K]
HeatFlowRate	QRooInt_flow	1000	Internal heat gains of the room [W]
HeatFlowRate	QRooC_flow_nominal	-QRooInt_flow - 10E3/30*(TOu...	Nominal cooling load of the room [W]
MassFlowRate	mA_flow_nominal	1.3*QRooC_flow_nominal/1006/...	Nominal air mass flow rate, increased by factor 1.3 to allow for recovery after temperature setback [kg/s]
TemperatureDifference	dTFan	2	Estimated temperature raise across fan that needs to be made up by the cooling coil [K]
HeatFlowRate	QCoiC_flow_nominal	4*(QRooC_flow_nominal + mA_f...	Cooling load of coil, taking into account economizer, and increased due to latent heat removal [W]
Temperature	TWSup_nominal	273.15 + 16	Water supply temperature [K]
Temperature	TWRet_nominal	273.15 + 12	Water return temperature [K]
MassFlowRate	mW_flow_nominal	QCoiC_flow_nominal/(TWRet_no...	Nominal water mass flow rate [kg/s]

Connectors

Type	Name	Description
Bus	weaBus

Modelica definition

model BaseCase "Base case model used for the validation of the FMI interfaces" extends Buildings.Examples.Tutorial.SpaceCooling.System3( vol(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial), fan(nominalValuesDefineDefaultPressureCurve=true), hex(dp1_nominal=200 + 10, dp2_nominal=200 + 200)); end BaseCase;

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC.TwoRooms

Model with two simple thermal zones, each having three air flow paths

Buildings.Fluid.FMI.ExportContainers.Validation.RoomHVAC.TwoRooms

Information

This model extends Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZones to implement two simple thermal zones.

Extends from Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZones (Declaration of an FMU that exports multiple thermal zones).

Parameters

Type	Name	Default	Description
Integer	nZon	2	Number of thermal zones in this container
Integer	nPorts	3	Number of fluid ports for each zone (must be the same for every zone)
replaceable package MediumA		Air	Medium for air
Volume	V	6103	Room volume [m3]
Temperature	TASup_nominal	273.15 + 18	Nominal air temperature supplied to room [K]
Temperature	TRooSet	273.15 + 24	Nominal room air temperature [K]
Temperature	TOut_nominal	273.15 + 30	Design outlet air temperature [K]
HeatFlowRate	QRooInt_flow	1000	Internal heat gains of the room [W]
HeatFlowRate	QRooC_flow_nominal	-QRooInt_flow - 10E3/30*(TOu...	Nominal cooling load of the room [W]
MassFlowRate	mA_flow_nominal	1.3*QRooC_flow_nominal/1006/...	Nominal air mass flow rate, increased by factor 1.3 to allow for recovery after temperature setback [kg/s]

Connectors

Type	Name	Description
Inlet	fluPor[nZon, nPorts]	Fluid connectors
Bus	weaBus	Weather data bus
output RealOutput	TOut	Outdoor temperature [K]
output RealOutput	TRad1	Radiative temperature [K]
output RealOutput	TRad2	Radiative temperature [K]

Modelica definition

model TwoRooms "Model with two simple thermal zones, each having three air flow paths" extends Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZones; end TwoRooms;