Buildings.ThermalZones.EnergyPlus_24_2

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice

Package with VAV models for a small office building

Information

This package contains variable air volume flow models for a office building.

Note

The models Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter and Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter appear to be quite similar to Buildings.Examples.VAVReheat.ASHRAE2006 and Buildings.Examples.VAVReheat.Guideline36, respectively, because they all have the same HVAC system, control sequences, and all have five thermal zones. However, the models in Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice are from the DOE Commercial Reference Building, Small Office, new construction, ASHRAE 90.1-2004, Version 1.3_5.0, whereas the models in Buildings.Examples.VAVReheat are from the DOE Commercial Building Benchmark, Medium Office, new construction, ASHRAE 90.1-2004, version 1.2_4.0. Therefore, the dimensions of the thermal zones in Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice are considerably smaller than in Buildings.Examples.VAVReheat. As the sizing is scaled with the volumes of the thermal zones, the model structure is the same, but the design capacities are different, as is the energy consumption.

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

Package Content

Name	Description
ASHRAE2006Spring	Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006
ASHRAE2006Summer	Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006
ASHRAE2006Summer_Autosizing	Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing
ASHRAE2006Winter	Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006
ASHRAE2006Winter_Autosizing	Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing
Guideline36Spring	Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller
Guideline36Summer	Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller
Guideline36Summer_Autosizing	Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller with HVAC sized using autosizing
Guideline36Winter	Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller
Guideline36Winter_Autosizing	Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller, with HVAC sized using autosizing
IdealHeatingCoolingSpring	Building with constant fresh air and ideal heating/cooling that exactly meets set point
IdealHeatingCoolingSummer	Building with constant fresh air and ideal heating/cooling that exactly meets set point
IdealHeatingCoolingSummer_Autosizing	Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing
IdealHeatingCoolingWinter	Building with constant fresh air and ideal heating/cooling that exactly meets set point
IdealHeatingCoolingWinter_Autosizing	Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing
Unconditioned	Open loop model of one floor
BaseClasses	Package with base classes

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Spring

Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Spring

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter but configured for simulation of a few days in spring.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter (Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [m3/(m3.h)]
Real	ACHSou	4	Design air change per hour south [m3/(m3.h)]
Real	ACHEas	6	Design air change per hour east [m3/(m3.h)]
Real	ACHNor	4	Design air change per hour north [m3/(m3.h)]
Real	ACHWes	6	Design air change per hour west [m3/(m3.h)]

Modelica definition

model ASHRAE2006Spring "Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter; end ASHRAE2006Spring;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Summer

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter but configured for simulation of a few days in summer.

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [m3/(m3.h)]
Real	ACHSou	4	Design air change per hour south [m3/(m3.h)]
Real	ACHEas	6	Design air change per hour east [m3/(m3.h)]
Real	ACHNor	4	Design air change per hour north [m3/(m3.h)]
Real	ACHWes	6	Design air change per hour west [m3/(m3.h)]

Modelica definition

model ASHRAE2006Summer "Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter; end ASHRAE2006Summer;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Summer_Autosizing

Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Summer_Autosizing

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter_Autosizing but configured for simulation of a few days in summer.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter_Autosizing (Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	flo.cor.sizCoo.QSen_flow/(cp...	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	flo.sou.sizCoo.QSen_flow/(cp...	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	flo.eas.sizCoo.QSen_flow/(cp...	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	flo.nor.sizCoo.QSen_flow/(cp...	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	flo.wes.sizCoo.QSen_flow/(cp...	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Temperature	TZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone temperature set point weighted by zone airflow [K]
MassFraction	XZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone humidity ratio cooling set point weighted by zone airflow [1]
Temperature	TCooAirSup_nominal	12 + 273.15	Nominal discharge air temperature for AHU during cooling [K]
MassFraction	XCooAirSup_nominal	0.0085/(1 + 0.0085)	Nominal discharge air humidity ratio for AHU during cooling [1]
HeatFlowRate	QCooSenAHU_flow_nominal	hvac.mCooAir_flow_nominal*cp...	Nominal sensible cooling load on AHU cooling coil [W]
HeatFlowRate	QCooLatAHU_flow_nominal	hvac.mCooAir_flow_nominal*h_...	Nominal latent cooling load on AHU cooling coil [W]
Temperature	THeaAirDis_nominal	40 + 273.15	Nominal discharge air temperature for VAV boxes during heating [K]

Modelica definition

model ASHRAE2006Summer_Autosizing "Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter_Autosizing; end ASHRAE2006Summer_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter

Information

This model consist of an HVAC system, a building envelope model and a model for air flow through building leakage and through open doors.

The HVAC system is a variable air volume (VAV) flow system with economizer and a heating and cooling coil in the air handler unit. There is also a reheat coil and an air damper in each of the five zone inlet branches. The figure below shows the schematic diagram of the HVAC system

See the model Buildings.Examples.VAVReheat.BaseClasses.PartialHVAC for a description of the HVAC system, and see the model Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor for a description of the building envelope.

The control is an implementation of the control sequence VAV 2A2-21232 of the Sequences of Operation for Common HVAC Systems (ASHRAE, 2006). In this control sequence, the supply fan speed is regulated based on the duct static pressure. The return fan controller tracks the supply fan air flow rate. The duct static pressure is adjusted so that at least one VAV damper is 90% open. The economizer dampers are modulated to track the setpoint for the mixed air dry bulb temperature. Priority is given to maintain a minimum outside air volume flow rate. In each zone, the VAV damper is adjusted to meet the room temperature setpoint for cooling, or fully opened during heating. The room temperature setpoint for heating is tracked by varying the water flow rate through the reheat coil. There is also a finite state machine that transitions the mode of operation of the HVAC system between the modes occupied, unoccupied off, unoccupied night set back, unoccupied warm-up and unoccupied pre-cool. In the VAV model, all air flows are computed based on the duct static pressure distribution and the performance curves of the fans. Local loop control is implemented using proportional and proportional-integral controllers, while the supervisory control is implemented using a finite state machine.

A similar model but with a different control sequence can be found in Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter.

References

ASHRAE. Sequences of Operation for Common HVAC Systems. ASHRAE, Atlanta, GA, 2006.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding (Partial model that contains the HVAC and building model).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [m3/(m3.h)]
Real	ACHSou	4	Design air change per hour south [m3/(m3.h)]
Real	ACHEas	6	Design air change per hour east [m3/(m3.h)]
Real	ACHNor	4	Design air change per hour north [m3/(m3.h)]
Real	ACHWes	6	Design air change per hour west [m3/(m3.h)]

Modelica definition

model ASHRAE2006Winter "Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006" extends Modelica.Icons.Example; extends Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding( mCor_flow_nominal=ACHCor*VRooCor*conv, mSou_flow_nominal=ACHSou*VRooSou*conv, mEas_flow_nominal=ACHEas*VRooEas*conv, mNor_flow_nominal=ACHNor*VRooNor*conv, mWes_flow_nominal=ACHWes*VRooWes*conv, redeclare Buildings.Examples.VAVReheat.BaseClasses.ASHRAE2006 hvac, redeclare Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor flo); parameter Real ACHCor(final unit="m3/(m3.h)")=4 "Design air change per hour core"; parameter Real ACHSou(final unit="m3/(m3.h)")=4 "Design air change per hour south"; parameter Real ACHEas(final unit="m3/(m3.h)")=6 "Design air change per hour east"; parameter Real ACHNor(final unit="m3/(m3.h)")=4 "Design air change per hour north"; parameter Real ACHWes(final unit="m3/(m3.h)")=6 "Design air change per hour west"; end ASHRAE2006Winter;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter_Autosizing

Information

Same example as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter, except that the HVAC system is sized using the autosizing feature in Spawn. The autosizing feature is used as follows:

Zone level heating and cooling nominal air flowrates for each VAV box are sized using the autosized zone level design sensible heating and cooling loads and design heating and cooling temperature set points.
Zone level minimum outside air flowrates are specified using the autosized zone level design minimum outside air flowrates.
AHU nominal air flowrate is specified using the autosized system level design sensible cooling load as well as an assumed average of the zone cooling temperature set points.
AHU minimum outside air flowrate is specified using the autosized system level design minimum outside air flowrate.
AHU cooling coil nominal capacity is calculated as the sum the design system level sensible and latent loads. The sensible/latent load is calculated using a design mixed air temperature/humidity ratio determined using mixing box mass and energy balance that makes use of the autosized system level cooling design outside air temperature/humidity ratio and minimum outside air flowrate, along with the determined AHU nominal air flowrate and the assumed average of the zone cooling temperature/humidity ratio set points.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding (Partial model that contains the HVAC and building model).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	flo.cor.sizCoo.QSen_flow/(cp...	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	flo.sou.sizCoo.QSen_flow/(cp...	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	flo.eas.sizCoo.QSen_flow/(cp...	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	flo.nor.sizCoo.QSen_flow/(cp...	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	flo.wes.sizCoo.QSen_flow/(cp...	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Temperature	TZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone temperature set point weighted by zone airflow [K]
MassFraction	XZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone humidity ratio cooling set point weighted by zone airflow [1]
Temperature	TCooAirSup_nominal	12 + 273.15	Nominal discharge air temperature for AHU during cooling [K]
MassFraction	XCooAirSup_nominal	0.0085/(1 + 0.0085)	Nominal discharge air humidity ratio for AHU during cooling [1]
HeatFlowRate	QCooSenAHU_flow_nominal	hvac.mCooAir_flow_nominal*cp...	Nominal sensible cooling load on AHU cooling coil [W]
HeatFlowRate	QCooLatAHU_flow_nominal	hvac.mCooAir_flow_nominal*h_...	Nominal latent cooling load on AHU cooling coil [W]
Temperature	THeaAirDis_nominal	40 + 273.15	Nominal discharge air temperature for VAV boxes during heating [K]

Modelica definition

model ASHRAE2006Winter_Autosizing "Variable air volume flow system with terminal reheat and five thermal zones using a control sequence published by ASHRAE in 2006 with HVAC sized using autosizing" extends Modelica.Icons.Example; extends Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding( mCor_flow_nominal=flo.cor.sizCoo.QSen_flow/(cpAir*(flo.cor.sizCoo.TSet - hvac.TCooAirSup_nominal)), mSou_flow_nominal=flo.sou.sizCoo.QSen_flow/(cpAir*(flo.sou.sizCoo.TSet - hvac.TCooAirSup_nominal)), mEas_flow_nominal=flo.eas.sizCoo.QSen_flow/(cpAir*(flo.eas.sizCoo.TSet - hvac.TCooAirSup_nominal)), mNor_flow_nominal=flo.nor.sizCoo.QSen_flow/(cpAir*(flo.nor.sizCoo.TSet - hvac.TCooAirSup_nominal)), mWes_flow_nominal=flo.wes.sizCoo.QSen_flow/(cpAir*(flo.wes.sizCoo.TSet - hvac.TCooAirSup_nominal)), redeclare Buildings.Examples.VAVReheat.BaseClasses.ASHRAE2006 hvac( TCooAirSup_nominal=TCooAirSup_nominal, VAVBox( THeaAirDis_nominal= {THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal}), mCooAir_flow_nominal=flo.sysVAV1.sizCoo.QSen_flow/(cpAir*(TZonSetAve - hvac.TCooAirSup_nominal)), mHeaVAV_flow_nominal= {flo.sou.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[1].THeaAirDis_nominal - flo.sou.sizHea.TSet)), flo.eas.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[2].THeaAirDis_nominal - flo.eas.sizHea.TSet)), flo.nor.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[3].THeaAirDis_nominal - flo.nor.sizHea.TSet)), flo.wes.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[4].THeaAirDis_nominal - flo.wes.sizHea.TSet)), flo.cor.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[5].THeaAirDis_nominal - flo.cor.sizHea.TSet))}, TCooAirMix_nominal = ((hvac.mCooAir_flow_nominal-flo.sysVAV1.sizCoo.mOut_flow)*TZonSetAve + flo.sysVAV1.sizCoo.mOut_flow*flo.sysVAV1.sizCoo.TOut)/hvac.mCooAir_flow_nominal, wCooAirMix_nominal = ((hvac.mCooAir_flow_nominal-flo.sysVAV1.sizCoo.mOut_flow)*XZonSetAve + flo.sysVAV1.sizCoo.mOut_flow*flo.sysVAV1.sizCoo.XOut)/hvac.mCooAir_flow_nominal, QCooAHU_flow_nominal=QCooSenAHU_flow_nominal + QCooLatAHU_flow_nominal, Vot_flow_nominal=flo.sysVAV1.sizCoo.mOut_flow/1.2, VZonOA_flow_nominal= {flo.sou.sizHea.mOut_flow/1.2, flo.eas.sizHea.mOut_flow/1.2, flo.nor.sizHea.mOut_flow/1.2, flo.wes.sizHea.mOut_flow/1.2, flo.cor.sizHea.mOut_flow/1.2}), redeclare Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor_Autosizing flo); parameter Modelica.Units.SI.Temperature TZonSetAve = (mCor_flow_nominal*flo.cor.sizCoo.TSet+ mSou_flow_nominal*flo.sou.sizCoo.TSet+ mEas_flow_nominal*flo.eas.sizCoo.TSet+ mNor_flow_nominal*flo.nor.sizCoo.TSet+ mWes_flow_nominal*flo.wes.sizCoo.TSet)/ (mCor_flow_nominal+ mSou_flow_nominal+ mEas_flow_nominal+ mNor_flow_nominal+ mWes_flow_nominal) "Average cooling zone temperature set point weighted by zone airflow"; parameter Modelica.Units.SI.MassFraction XZonSetAve = (mCor_flow_nominal*flo.cor.sizCoo.XSet+ mSou_flow_nominal*flo.sou.sizCoo.XSet+ mEas_flow_nominal*flo.eas.sizCoo.XSet+ mNor_flow_nominal*flo.nor.sizCoo.XSet+ mWes_flow_nominal*flo.wes.sizCoo.XSet)/ (mCor_flow_nominal+ mSou_flow_nominal+ mEas_flow_nominal+ mNor_flow_nominal+ mWes_flow_nominal) "Average cooling zone humidity ratio cooling set point weighted by zone airflow"; parameter Modelica.Units.SI.Temperature TCooAirSup_nominal = 12+273.15 "Nominal discharge air temperature for AHU during cooling"; parameter Modelica.Units.SI.MassFraction XCooAirSup_nominal = 0.0085/(1+0.0085) "Nominal discharge air humidity ratio for AHU during cooling"; parameter Modelica.Units.SI.HeatFlowRate QCooSenAHU_flow_nominal = hvac.mCooAir_flow_nominal * cpAir *(TCooAirSup_nominal-hvac.TCooAirMix_nominal) "Nominal sensible cooling load on AHU cooling coil"; parameter Modelica.Units.SI.HeatFlowRate QCooLatAHU_flow_nominal = hvac.mCooAir_flow_nominal * h_fg *(XCooAirSup_nominal-hvac.wCooAirMix_nominal) "Nominal latent cooling load on AHU cooling coil"; parameter Modelica.Units.SI.Temperature THeaAirDis_nominal = 40+273.15 "Nominal discharge air temperature for VAV boxes during heating"; final parameter Modelica.Units.SI.SpecificHeatCapacity cpAir=MediumA.specificHeatCapacityCp(state_default) "Specific heat capacity of air at default medium state"; final parameter Modelica.Units.SI.SpecificEnergy h_fg= MediumA.enthalpyOfCondensingGas(TCooAirSup_nominal) "Latent heat of water vapor"; protected parameter MediumA.ThermodynamicState state_default = MediumA.setState_pTX( MediumA.p_default, MediumA.T_default, MediumA.X_default) "Default state"; end ASHRAE2006Winter_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Spring

Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Spring

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter but configured for simulation of a few days in spring.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter (Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [1/h]
Real	ACHSou	4	Design air change per hour south [1/h]
Real	ACHEas	6	Design air change per hour east [1/h]
Real	ACHNor	4	Design air change per hour north [1/h]
Real	ACHWes	6	Design air change per hour west [1/h]

Modelica definition

model Guideline36Spring "Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter; end Guideline36Spring;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Summer

Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Summer

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter but configured for simulation of a few days in summer.

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [1/h]
Real	ACHSou	4	Design air change per hour south [1/h]
Real	ACHEas	6	Design air change per hour east [1/h]
Real	ACHNor	4	Design air change per hour north [1/h]
Real	ACHWes	6	Design air change per hour west [1/h]

Modelica definition

model Guideline36Summer "Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter; end Guideline36Summer;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Summer_Autosizing

Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller with HVAC sized using autosizing

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Summer_Autosizing

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter_Autosizing but configured for simulation of a few days in summer.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter_Autosizing (Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller, with HVAC sized using autosizing).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	flo.cor.sizCoo.QSen_flow/(cp...	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	flo.sou.sizCoo.QSen_flow/(cp...	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	flo.eas.sizCoo.QSen_flow/(cp...	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	flo.nor.sizCoo.QSen_flow/(cp...	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	flo.wes.sizCoo.QSen_flow/(cp...	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Temperature	TZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone temperature set point weighted by zone airflow [K]
MassFraction	XZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone humidity ratio cooling set point weighted by zone airflow [1]
Temperature	TCooAirSup_nominal	12 + 273.15	Nominal discharge air temperature for AHU during cooling [K]
MassFraction	XCooAirSup_nominal	0.0085/(1 + 0.0085)	Nominal discharge air humidity ratio for AHU during cooling [1]
HeatFlowRate	QCooSenAHU_flow_nominal	hvac.mCooAir_flow_nominal*cp...	Nominal sensible cooling load on AHU cooling coil [W]
HeatFlowRate	QCooLatAHU_flow_nominal	hvac.mCooAir_flow_nominal*h_...	Nominal latent cooling load on AHU cooling coil [W]
Temperature	THeaAirDis_nominal	40 + 273.15	Nominal discharge air temperature for VAV boxes during heating [K]

Modelica definition

model Guideline36Summer_Autosizing "Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller with HVAC sized using autosizing" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter_Autosizing; end Guideline36Summer_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter

Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter

Information

This model consist of an HVAC system, a building envelope model and a model for air flow through building leakage and through open doors.

The control is based on ASHRAE Guideline 36, and implemented using the sequences from the library Buildings.Controls.OBC.ASHRAE.G36 for multi-zone VAV systems with economizer. The schematic diagram of the HVAC and control sequence is shown in the figure below.

A similar model but with a different control sequence can be found in Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.ASHRAE2006Winter. Note that this model, because of the frequent time sampling, has longer computing time than Buildings.Examples.VAVReheat.ASHRAE2006. The reason is that the time integrator cannot make large steps because it needs to set a time step each time the control samples its input.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding (Partial model that contains the HVAC and building model).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	ACHCorVRooCorconv	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	ACHSouVRooSouconv	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	ACHEasVRooEasconv	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	ACHNorVRooNorconv	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	ACHWesVRooWesconv	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Real	ACHCor	4	Design air change per hour core [1/h]
Real	ACHSou	4	Design air change per hour south [1/h]
Real	ACHEas	6	Design air change per hour east [1/h]
Real	ACHNor	4	Design air change per hour north [1/h]
Real	ACHWes	6	Design air change per hour west [1/h]

Modelica definition

model Guideline36Winter "Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller" extends Modelica.Icons.Example; extends Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding( mCor_flow_nominal=ACHCor*VRooCor*conv, mSou_flow_nominal=ACHSou*VRooSou*conv, mEas_flow_nominal=ACHEas*VRooEas*conv, mNor_flow_nominal=ACHNor*VRooNor*conv, mWes_flow_nominal=ACHWes*VRooWes*conv, redeclare Buildings.Examples.VAVReheat.BaseClasses.Guideline36 hvac, redeclare Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor flo); parameter Real ACHCor(final unit="1/h")=4 "Design air change per hour core"; parameter Real ACHSou(final unit="1/h")=4 "Design air change per hour south"; parameter Real ACHEas(final unit="1/h")=6 "Design air change per hour east"; parameter Real ACHNor(final unit="1/h")=4 "Design air change per hour north"; parameter Real ACHWes(final unit="1/h")=6 "Design air change per hour west"; end Guideline36Winter;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter_Autosizing

Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller, with HVAC sized using autosizing

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter_Autosizing

Information

Same example as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter, except that the HVAC system is sized using the autosizing feature in Spawn. The autosizing feature is used as follows:

Zone level heating and cooling nominal air flowrates for each VAV box are sized using the autosized zone level design sensible heating and cooling loads and design heating and cooling temperature set points.
Zone level minimum outside air flowrates are specified using the autosized zone level design minimum outside air flowrates.
AHU nominal air flowrate is specified using the autosized system level design sensible cooling load as well as an assumed average of the zone cooling temperature set points.
AHU minimum outside air flowrate is specified using the autosized system level design minimum outside air flowrate.
AHU cooling coil nominal capacity is calculated as the sum the design system level sensible and latent loads. The sensible/latent load is calculated using a design mixed air temperature/humidity ratio determined using mixing box mass and energy balance that makes use of the autosized system level cooling design outside air temperature/humidity ratio and minimum outside air flowrate, along with the determined AHU nominal air flowrate and the assumed average of the zone cooling temperature/humidity ratio set points.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding (Partial model that contains the HVAC and building model).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model for air
replaceable package MediumW		Water	Medium model for water
MassFlowRate	mCor_flow_nominal	flo.cor.sizCoo.QSen_flow/(cp...	Design mass flow rate core [kg/s]
MassFlowRate	mSou_flow_nominal	flo.sou.sizCoo.QSen_flow/(cp...	Design mass flow rate south [kg/s]
MassFlowRate	mEas_flow_nominal	flo.eas.sizCoo.QSen_flow/(cp...	Design mass flow rate east [kg/s]
MassFlowRate	mNor_flow_nominal	flo.nor.sizCoo.QSen_flow/(cp...	Design mass flow rate north [kg/s]
MassFlowRate	mWes_flow_nominal	flo.wes.sizCoo.QSen_flow/(cp...	Design mass flow rate west [kg/s]
Temperature	THeaWatInl_nominal	45 + 273.15	Reheat coil nominal inlet water temperature [K]
Temperature	TZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone temperature set point weighted by zone airflow [K]
MassFraction	XZonSetAve	(mCor_flow_nominal*flo.cor.s...	Average cooling zone humidity ratio cooling set point weighted by zone airflow [1]
Temperature	TCooAirSup_nominal	12 + 273.15	Nominal discharge air temperature for AHU during cooling [K]
MassFraction	XCooAirSup_nominal	0.0085/(1 + 0.0085)	Nominal discharge air humidity ratio for AHU during cooling [1]
HeatFlowRate	QCooSenAHU_flow_nominal	hvac.mCooAir_flow_nominal*cp...	Nominal sensible cooling load on AHU cooling coil [W]
HeatFlowRate	QCooLatAHU_flow_nominal	hvac.mCooAir_flow_nominal*h_...	Nominal latent cooling load on AHU cooling coil [W]
Temperature	THeaAirDis_nominal	40 + 273.15	Nominal discharge air temperature for VAV boxes during heating [K]

Modelica definition

model Guideline36Winter_Autosizing "Variable air volume flow system with terminal reheat and five thermal zones controlled using an ASHRAE G36 controller, with HVAC sized using autosizing" extends Modelica.Icons.Example; extends Buildings.Examples.VAVReheat.BaseClasses.HVACBuilding( mCor_flow_nominal=flo.cor.sizCoo.QSen_flow/(cpAir*(flo.cor.sizCoo.TSet - hvac.TCooAirSup_nominal)), mSou_flow_nominal=flo.sou.sizCoo.QSen_flow/(cpAir*(flo.sou.sizCoo.TSet - hvac.TCooAirSup_nominal)), mEas_flow_nominal=flo.eas.sizCoo.QSen_flow/(cpAir*(flo.eas.sizCoo.TSet - hvac.TCooAirSup_nominal)), mNor_flow_nominal=flo.nor.sizCoo.QSen_flow/(cpAir*(flo.nor.sizCoo.TSet - hvac.TCooAirSup_nominal)), mWes_flow_nominal=flo.wes.sizCoo.QSen_flow/(cpAir*(flo.wes.sizCoo.TSet - hvac.TCooAirSup_nominal)), redeclare Buildings.Examples.VAVReheat.BaseClasses.Guideline36 hvac( TCooAirSup_nominal=TCooAirSup_nominal, VAVBox( THeaAirDis_nominal= {THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal, THeaAirDis_nominal}), mCooAir_flow_nominal=flo.sysVAV1.sizCoo.QSen_flow/(cpAir*(TZonSetAve - hvac.TCooAirSup_nominal)), mHeaVAV_flow_nominal= {flo.sou.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[1].THeaAirDis_nominal - flo.sou.sizHea.TSet)), flo.eas.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[2].THeaAirDis_nominal - flo.eas.sizHea.TSet)), flo.nor.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[3].THeaAirDis_nominal - flo.nor.sizHea.TSet)), flo.wes.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[4].THeaAirDis_nominal - flo.wes.sizHea.TSet)), flo.cor.sizHea.QSen_flow/(cpAir*(hvac.VAVBox[5].THeaAirDis_nominal - flo.cor.sizHea.TSet))}, TCooAirMix_nominal = ((hvac.mCooAir_flow_nominal-flo.sysVAV1.sizCoo.mOut_flow)*TZonSetAve + flo.sysVAV1.sizCoo.mOut_flow*flo.sysVAV1.sizCoo.TOut)/hvac.mCooAir_flow_nominal, wCooAirMix_nominal = ((hvac.mCooAir_flow_nominal-flo.sysVAV1.sizCoo.mOut_flow)*XZonSetAve + flo.sysVAV1.sizCoo.mOut_flow*flo.sysVAV1.sizCoo.XOut)/hvac.mCooAir_flow_nominal, QCooAHU_flow_nominal=QCooSenAHU_flow_nominal + QCooLatAHU_flow_nominal, Vot_flow_nominal=flo.sysVAV1.sizCoo.mOut_flow/1.2, VZonOA_flow_nominal= {flo.sou.sizHea.mOut_flow/1.2, flo.eas.sizHea.mOut_flow/1.2, flo.nor.sizHea.mOut_flow/1.2, flo.wes.sizHea.mOut_flow/1.2, flo.cor.sizHea.mOut_flow/1.2}), redeclare Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor_Autosizing flo); parameter Modelica.Units.SI.Temperature TZonSetAve = (mCor_flow_nominal*flo.cor.sizCoo.TSet+ mSou_flow_nominal*flo.sou.sizCoo.TSet+ mEas_flow_nominal*flo.eas.sizCoo.TSet+ mNor_flow_nominal*flo.nor.sizCoo.TSet+ mWes_flow_nominal*flo.wes.sizCoo.TSet)/ (mCor_flow_nominal+ mSou_flow_nominal+ mEas_flow_nominal+ mNor_flow_nominal+ mWes_flow_nominal) "Average cooling zone temperature set point weighted by zone airflow"; parameter Modelica.Units.SI.MassFraction XZonSetAve = (mCor_flow_nominal*flo.cor.sizCoo.XSet+ mSou_flow_nominal*flo.sou.sizCoo.XSet+ mEas_flow_nominal*flo.eas.sizCoo.XSet+ mNor_flow_nominal*flo.nor.sizCoo.XSet+ mWes_flow_nominal*flo.wes.sizCoo.XSet)/ (mCor_flow_nominal+ mSou_flow_nominal+ mEas_flow_nominal+ mNor_flow_nominal+ mWes_flow_nominal) "Average cooling zone humidity ratio cooling set point weighted by zone airflow"; parameter Modelica.Units.SI.Temperature TCooAirSup_nominal = 12+273.15 "Nominal discharge air temperature for AHU during cooling"; parameter Modelica.Units.SI.MassFraction XCooAirSup_nominal = 0.0085/(1+0.0085) "Nominal discharge air humidity ratio for AHU during cooling"; parameter Modelica.Units.SI.HeatFlowRate QCooSenAHU_flow_nominal = hvac.mCooAir_flow_nominal * cpAir *(TCooAirSup_nominal-hvac.TCooAirMix_nominal) "Nominal sensible cooling load on AHU cooling coil"; parameter Modelica.Units.SI.HeatFlowRate QCooLatAHU_flow_nominal = hvac.mCooAir_flow_nominal * h_fg *(XCooAirSup_nominal-hvac.wCooAirMix_nominal) "Nominal latent cooling load on AHU cooling coil"; parameter Modelica.Units.SI.Temperature THeaAirDis_nominal = 40+273.15 "Nominal discharge air temperature for VAV boxes during heating"; final parameter Modelica.Units.SI.SpecificHeatCapacity cpAir=MediumA.specificHeatCapacityCp(state_default) "Specific heat capacity of air at default medium state"; final parameter Modelica.Units.SI.SpecificEnergy h_fg= MediumA.enthalpyOfCondensingGas(TCooAirSup_nominal) "Latent heat of water vapor"; protected parameter MediumA.ThermodynamicState state_default = MediumA.setState_pTX( MediumA.p_default, MediumA.T_default, MediumA.X_default) "Default state"; end Guideline36Winter_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSpring

Building with constant fresh air and ideal heating/cooling that exactly meets set point

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSpring

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter but configured for simulation of a few days in summer.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter (Building with constant fresh air and ideal heating/cooling that exactly meets set point).

Parameters

Type	Name	Default	Description
replaceable package Medium		Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file
Floor	flo	redeclare Buildings.ThermalZ...	One floor of the office building

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IdealHeatingCoolingSpring "Building with constant fresh air and ideal heating/cooling that exactly meets set point" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter; end IdealHeatingCoolingSpring;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSummer

Building with constant fresh air and ideal heating/cooling that exactly meets set point

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSummer

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter but configured for simulation of a few days in summer.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter (Building with constant fresh air and ideal heating/cooling that exactly meets set point).

Parameters

Type	Name	Default	Description
replaceable package Medium		Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file
Floor	flo	redeclare Buildings.ThermalZ...	One floor of the office building

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IdealHeatingCoolingSummer "Building with constant fresh air and ideal heating/cooling that exactly meets set point" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter; end IdealHeatingCoolingSummer;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSummer_Autosizing

Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingSummer_Autosizing

Information

This is the same model as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter_Autosizing but configured for simulation of a few days in summer.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter_Autosizing (Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing).

Parameters

Type	Name	Default	Description
replaceable package Medium		Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IdealHeatingCoolingSummer_Autosizing "Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter_Autosizing; end IdealHeatingCoolingSummer_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter

Building with constant fresh air and ideal heating/cooling that exactly meets set point

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter

Information

Test case of the small office DOE reference building without an HVAC system but an ideal heating/cooling device that exactly meets the load.

Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Unconditioned (Open loop model of one floor).

Parameters

Type	Name	Default	Description
replaceable package Medium		Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file
Floor	flo	redeclare Buildings.ThermalZ...	One floor of the office building

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IdealHeatingCoolingWinter "Building with constant fresh air and ideal heating/cooling that exactly meets set point" extends Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Unconditioned; Buildings.Controls.OBC.CDL.Reals.Sources.Constant THeaSet[5]( k(each final unit="K", each displayUnit="degC")=fill(293.15, 5)) "Set point temperature for heating"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant THeaCoo[5]( k(each final unit="K", each displayUnit="degC")=fill(299.15, 5)) "Set point temperature for cooling"; BaseClasses.IdealHeaterCooler[5] hea( Q_flow_nominal=70*{flo.AFloSou,flo.AFloEas,flo.AFloNor,flo.AFloWes,flo.AFloCor}) "Ideal heater"; BaseClasses.IdealHeaterCooler[5] coo( Q_flow_nominal=-50*{flo.AFloSou,flo.AFloEas,flo.AFloNor,flo.AFloWes,flo.AFloCor}) "Ideal cooling device for sensible cooling"; Buildings.Controls.OBC.CDL.Reals.MultiSum QHea_flow( nin=5) "Total heat flow rate"; Modelica.Blocks.Continuous.Integrator EHea "Heating energy"; Buildings.Controls.OBC.CDL.Reals.MultiSum QCoo_flow( nin=5) "Total heat flow rate"; Modelica.Blocks.Continuous.Integrator ECoo "Cooling energy"; equation connect(flo.TRooAir,hea.TMea); connect(THeaSet.y,hea.TSet); connect(coo[1].heaPor,flo.heaPorSou); connect(coo[2].heaPor,flo.heaPorEas); connect(coo[3].heaPor,flo.heaPorNor); connect(coo[4].heaPor,flo.heaPorWes); connect(coo[5].heaPor,flo.heaPorCor); connect(hea[1].heaPor,flo.heaPorSou); connect(hea[2].heaPor,flo.heaPorEas); connect(hea[3].heaPor,flo.heaPorNor); connect(hea[4].heaPor,flo.heaPorWes); connect(hea[5].heaPor,flo.heaPorCor); connect(THeaCoo.y,coo.TSet); connect(flo.TRooAir,coo.TMea); connect(QHea_flow.y,EHea.u); connect(hea.Q_flow,QHea_flow.u); connect(QCoo_flow.y,ECoo.u); connect(QCoo_flow.u[1:5],coo.Q_flow); end IdealHeatingCoolingWinter;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter_Autosizing

Information

Same example as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.IdealHeatingCoolingWinter, except that the autosizing feature in Spawn is used to define two HVAC systems, one serving the perimeter zones and one serving the core zone. The system serving the perimeter zones has autosizeHVAC=true, while the one serving the core zone has autosizeHVAC=false. The zone level design sensible heating and cooling loads returned from the Spawn autosizing are used to size the ideal heaters and coolers and the design heating and cooling temperature set points are used to specify the set points for the controllers.

Extends from IdealHeatingCoolingWinter (Building with constant fresh air and ideal heating/cooling that exactly meets set point).

Parameters

Type	Name	Default	Description
replaceable package Medium		Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IdealHeatingCoolingWinter_Autosizing "Building with constant fresh air and ideal heating/cooling that exactly meets set point with HVAC sized using autosizing" extends IdealHeatingCoolingWinter( redeclare Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor_Autosizing_MultipleSystems flo, coo( Q_flow_nominal=-{ flo.sou.sizCoo.QSen_flow, flo.eas.sizCoo.QSen_flow, flo.nor.sizCoo.QSen_flow, flo.wes.sizCoo.QSen_flow, flo.cor.sizCoo.QSen_flow}), hea( Q_flow_nominal={ flo.sou.sizHea.QSen_flow, flo.eas.sizHea.QSen_flow, flo.nor.sizHea.QSen_flow, flo.wes.sizHea.QSen_flow, flo.cor.sizHea.QSen_flow}), THeaCoo( k={ flo.sou.sizCoo.TSet, flo.eas.sizCoo.TSet, flo.nor.sizCoo.TSet, flo.wes.sizCoo.TSet, flo.cor.sizCoo.TSet}), THeaSet( k={ flo.sou.sizHea.TSet, flo.eas.sizHea.TSet, flo.nor.sizHea.TSet, flo.wes.sizHea.TSet, flo.cor.sizHea.TSet})); end IdealHeatingCoolingWinter_Autosizing;

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Unconditioned

Open loop model of one floor

Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Unconditioned

Information

Test case of the small office DOE reference building without an HVAC system. Each thermal zone has a constant air flow rate of unconditioned outside air.

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

Parameters

Type	Name	Default	Description
replaceable package Medium		Buildings.Media.Air	Medium for air
String	weaName	Modelica.Utilities.Files.loa...	Name of the weather file
Floor	flo	flo(redeclare package Medium...	One floor of the office building

Connectors

Type	Name	Description
replaceable package Medium		Medium for air
Bus	weaBus	Weather data bus

Modelica definition

model Unconditioned "Open loop model of one floor" extends Modelica.Icons.Example; replaceable package Medium=Buildings.Media.Air "Medium for air"; parameter String weaName=Modelica.Utilities.Files.loadResource( "modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos") "Name of the weather file"; final parameter Modelica.Units.SI.MassFlowRate mOut_flow[4]=0.3/3600*{flo.VRooSou, flo.VRooEas,flo.VRooNor,flo.VRooWes}*1.2 "Outside air infiltration for each exterior room"; BoundaryConditions.WeatherData.ReaderTMY3 weaDat( filNam=weaName, computeWetBulbTemperature=false) "Weather data reader"; BoundaryConditions.WeatherData.Bus weaBus "Weather data bus"; replaceable Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.BaseClasses.Floor flo( redeclare package Medium=Medium, nor( T_start=275.15), wes( T_start=275.15), eas( T_start=275.15), sou( T_start=275.15), cor( T_start=275.15)) "One floor of the office building"; // Above, the volume V is for Spawn obtained in the initial equation section. // Hence it is not known when the model is compiled. This leads to a // warning in Dymola and an error in Optimica (Modelon#2020031339000191) // if used in an expression for the nominal attribute of lea*(res(m_flow(nominal=....))). // Assigning the nominal attribute to a constant avoids this warning and error. Buildings.Fluid.Sources.MassFlowSource_WeatherData bou[4]( redeclare each package Medium=Medium, m_flow=mOut_flow, each nPorts=1) "Infiltration, used to avoid that the absolute humidity is continuously increasing"; Buildings.Fluid.Sources.Outside out( redeclare package Medium=Medium, nPorts=1) "Outside condition"; Buildings.Fluid.FixedResistances.PressureDrop res( redeclare package Medium=Medium, m_flow_nominal=sum(mOut_flow), dp_nominal=10, linearized=true) "Small flow resistance for inlet"; Buildings.Fluid.FixedResistances.PressureDrop res1[4]( redeclare each package Medium=Medium, each m_flow_nominal=sum(mOut_flow), each dp_nominal=10, each linearized=true) "Small flow resistance for inlet"; equation connect(weaDat.weaBus,weaBus); connect(weaBus,flo.weaBus); connect(out.ports[1],res.port_a); connect(res.port_b,flo.portsCor[1]); connect(weaBus,out.weaBus); connect(bou[:].ports[1],res1[:].port_a); connect(weaBus,bou[1].weaBus); connect(weaBus,bou[2].weaBus); connect(weaBus,bou[3].weaBus); connect(weaBus,bou[4].weaBus); connect(res1[1].port_b,flo.portsSou[1]); connect(res1[2].port_b,flo.portsEas[1]); connect(res1[3].port_b,flo.portsNor[1]); connect(res1[4].port_b,flo.portsWes[1]); end Unconditioned;