Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses

Package with base classes

Information

This package contains base classes that are used to construct the classes in Buildings.DHC.Loads.BaseClasses.Validation.

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Package Content

Name	Description
Building	Dummy building model for validation purposes
BuildingWithETS	Dummy building with ETS model for validation purposes
ETS	Dummy ETS model for validation purposes
FanCoil2PipeCooling	Model of a sensible only two-pipe fan coil unit for cooling, computing a required chilled water mass flow rate
FanCoil2PipeHeating	Model of a two-pipe fan coil unit for heating, computing a required heating water mass flow rate
FanCoil2PipeHeatingValve	Model of a two-pipe fan coil unit for heating, with a two-way control valve

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.Building

Dummy building model for validation purposes

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.Building

Information

This is a minimum example of a class extending Buildings.DHC.Loads.BaseClasses.PartialBuilding developed for testing purposes only.

Extends from Buildings.DHC.Loads.BaseClasses.PartialBuilding (Partial class for building model).

Parameters

Type	Name	Default	Description
replaceable package Medium		Water	Medium in the building distribution system
MassFlowRate	m_flow_nominal		Nominal mass flow rate [kg/s]
Configuration
Boolean	have_heaWat	false	Set to true if the building has heating water system
Boolean	have_chiWat	false	Set to true if the building has chilled water system
Boolean	have_eleHea	false	Set to true if the building has decentralized electric heating system
Boolean	have_eleCoo	false	Set to true if the building has decentralized electric cooling system
Boolean	have_fan	false	Set to true if fan power is computed
Boolean	have_pum	false	Set to true if pump power is computed
Boolean	have_weaBus	false	Set to true to use a weather bus
Scaling
Real	facMul	1	Multiplier factor
Nominal condition
HeatFlowRate	QChiWat_flow_nominal		Design heat flow rate for chilled water production (<0) [W]
HeatFlowRate	QHeaWat_flow_nominal		Design heat flow rate for heating water production (>0) [W]
Assumptions
Boolean	allowFlowReversal	false	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus
FluidPorts_a	ports_aHeaWat[nPorts_aHeaWat]	Heating water inlet ports
FluidPorts_b	ports_bHeaWat[nPorts_bHeaWat]	Heating water outlet ports
FluidPorts_a	ports_aChiWat[nPorts_aChiWat]	Chilled water inlet ports
FluidPorts_b	ports_bChiWat[nPorts_bChiWat]	Chilled water outlet ports
output RealOutput	QHea_flow	Total heating heat flow rate transferred to the loads (>=0) [W]
output RealOutput	QCoo_flow	Total cooling heat flow rate transferred to the loads (<=0) [W]
output RealOutput	PHea	Power drawn by decentralized heating system [W]
output RealOutput	PCoo	Power drawn by decentralized cooling system [W]
output RealOutput	PFan	Power drawn by fan motors [W]
output RealOutput	PPum	Power drawn by pump motors [W]

Modelica definition

model Building "Dummy building model for validation purposes" extends Buildings.DHC.Loads.BaseClasses.PartialBuilding; parameter Modelica.Units.SI.HeatFlowRate QChiWat_flow_nominal "Design heat flow rate for chilled water production (<0)"; parameter Modelica.Units.SI.HeatFlowRate QHeaWat_flow_nominal "Design heat flow rate for heating water production (>0)"; parameter Modelica.Units.SI.MassFlowRate m_flow_nominal "Nominal mass flow rate"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPHea( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPCoo( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPFan( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPPum( k=1); Fluid.HeatExchangers.HeaterCooler_u loaHea( redeclare final package Medium=Medium, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, final Q_flow_nominal=-QHeaWat_flow_nominal, final m_flow_nominal=m_flow_nominal, dp_nominal=0) if have_heaWat "Heating load"; Fluid.HeatExchangers.HeaterCooler_u loaCoo( redeclare final package Medium = Medium, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, final Q_flow_nominal=-QChiWat_flow_nominal, final m_flow_nominal=m_flow_nominal, dp_nominal=0) if have_chiWat "Cooling load"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant one(k=1) "One"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gai( k=-1) if have_heaWat "Opposite"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gai1( k=-1) if have_chiWat "Opposite"; equation connect(souPHea.y, mulPHea.u); connect(souPCoo.y, mulPCoo.u); connect(souPFan.y, mulPFan.u); connect(souPPum.y, mulPPum.u); connect(mulHeaWatInl[1].port_b, loaHea.port_a); connect(loaHea.port_b, mulHeaWatOut[1].port_a); connect(loaCoo.port_b, mulChiWatOut[1].port_a); connect(mulChiWatInl[1].port_b, loaCoo.port_a); connect(loaHea.Q_flow, gai.u); connect(loaCoo.Q_flow, gai1.u); connect(gai.y, mulQHea_flow.u); connect(gai1.y, mulQCoo_flow.u); connect(one.y, loaHea.u); connect(one.y, loaCoo.u); end Building;

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.BuildingWithETS

Dummy building with ETS model for validation purposes

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.BuildingWithETS

Information

This is a minimum example of a class extending Buildings.DHC.Loads.BaseClasses.PartialBuildingWithPartialETS developed for testing purposes only.

Extends from Buildings.DHC.Loads.BaseClasses.PartialBuildingWithPartialETS (Partial model of a building with an energy transfer station).

Parameters

Type	Name	Default	Description
replaceable package MediumSer		Water	Service side medium
replaceable package MediumSerHea_a		Water	Service side medium at heating inlet
replaceable package MediumBui		Water	Building side medium
Configuration
Integer	nPorts_heaWat	0	Number of heating water fluid ports
Integer	nPorts_chiWat	0	Number of chilled water fluid ports
Scaling
Real	facMul	1	Multiplier factor
Assumptions
Boolean	allowFlowReversalSer	false	Set to true to allow flow reversal on service side
Boolean	allowFlowReversalBui	false	Set to true to allow flow reversal on building side

Connectors

Type	Name	Description
FluidPort_a	port_aSerAmb	Fluid connector for ambient water service supply line
FluidPort_b	port_bSerAmb	Fluid connector for ambient water service return line
FluidPort_a	port_aSerHea	Fluid connector for heating service supply line
FluidPort_b	port_bSerHea	Fluid connector for heating service return line
FluidPort_a	port_aSerCoo	Fluid connector for cooling service supply line
FluidPort_b	port_bSerCoo	Fluid connector for cooling service return line
Bus	weaBus	Weather data bus
output RealOutput	QHea_flow	Total heating heat flow rate transferred to the loads (>=0) [W]
output RealOutput	QCoo_flow	Total cooling heat flow rate transferred to the loads (<=0) [W]
output RealOutput	PHea	Power drawn by heating system [W]
output RealOutput	PCoo	Power drawn by cooling system [W]
output RealOutput	PFan	Power drawn by fan motors [W]
output RealOutput	PPum	Power drawn by pump motors [W]
output RealOutput	QFue_flow[nFue]	Fuel energy input rate [W]

Modelica definition

model BuildingWithETS "Dummy building with ETS model for validation purposes" extends Buildings.DHC.Loads.BaseClasses.PartialBuildingWithPartialETS( redeclare ETS ets, redeclare Building bui( final QChiWat_flow_nominal=QChiWat_flow_nominal, final QHeaWat_flow_nominal=QHeaWat_flow_nominal, final m_flow_nominal=ets.m_flow_nominal)); end BuildingWithETS;

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.ETS

Dummy ETS model for validation purposes

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.ETS

Information

This is a minimum example of a class extending Buildings.DHC.ETS.BaseClasses.PartialETS developed for testing purposes only.

Extends from Buildings.DHC.ETS.BaseClasses.PartialETS (Partial class for modeling an energy transfer station).

Parameters

Type	Name	Default	Description
replaceable package MediumSer		Water	Service side medium
replaceable package MediumSerHea_a		Water	Service side medium at heating inlet
replaceable package MediumBui		Water	Building side medium
Generic	fue[nFue]		Fuel type
MassFlowRate	m_flow_nominal		Nominal mass flow rate [kg/s]
Configuration
DistrictSystemType	typ	Buildings.DHC.Types.District...	Type of district system
Boolean	have_heaWat	false	Set to true if the ETS supplies heating water
Boolean	have_hotWat	false	Set to true if the ETS supplies hot water
Boolean	have_chiWat	false	Set to true if the ETS supplies chilled water
Boolean	have_fan	false	Set to true if fan power is computed
Boolean	have_pum	false	Set to true if pump power is computed
Boolean	have_eleHea	false	Set to true if the ETS has electric heating system
Integer	nFue	0	Number of fuel types (0 means no combustion system)
Boolean	have_eleCoo	false	Set to true if the ETS has electric cooling system
Boolean	have_weaBus	false	Set to true to use a weather bus
Nominal condition
HeatFlowRate	QHeaWat_flow_nominal	0	Nominal capacity of heating system (>=0) [W]
HeatFlowRate	QHotWat_flow_nominal	0	Nominal capacity of hot water production system (>=0) [W]
HeatFlowRate	QChiWat_flow_nominal	0	Nominal capacity of cooling system (<=0) [W]
Assumptions
Boolean	allowFlowReversalSer	false	Set to true to allow flow reversal on service side
Boolean	allowFlowReversalBui	false	Set to true to allow flow reversal on building side

Connectors

Type	Name	Description
FluidPorts_a	ports_aHeaWat[nPorts_aHeaWat]	Fluid connectors for heating water return (from building)
FluidPorts_b	ports_bHeaWat[nPorts_bHeaWat]	Fluid connectors for heating water supply (to building)
FluidPorts_a	ports_aChiWat[nPorts_aChiWat]	Fluid connectors for chilled water return (from building)
FluidPorts_b	ports_bChiWat[nPorts_bChiWat]	Fluid connectors for chilled water supply (to building)
FluidPort_a	port_aSerAmb	Fluid connector for ambient water service supply line
FluidPort_b	port_bSerAmb	Fluid connector for ambient water service return line
FluidPort_a	port_aSerHea	Fluid connector for heating service supply line
FluidPort_b	port_bSerHea	Fluid connector for heating service return line
FluidPort_a	port_aSerCoo	Fluid connector for cooling service supply line
FluidPort_b	port_bSerCoo	Fluid connector for cooling service return line
output RealOutput	PHea	Power drawn by heating system [W]
output RealOutput	PCoo	Power drawn by cooling system [W]
output RealOutput	PFan	Power drawn by fan motors [W]
output RealOutput	PPum	Power drawn by pump motors [W]
output RealOutput	QFue_flow[nFue]	Fuel energy input rate [W]
Bus	weaBus	Weather data bus

Modelica definition

model ETS "Dummy ETS model for validation purposes" extends Buildings.DHC.ETS.BaseClasses.PartialETS; parameter Modelica.Units.SI.MassFlowRate m_flow_nominal "Nominal mass flow rate"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPHea( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPCoo( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPFan( k=1); Buildings.Controls.OBC.CDL.Reals.Sources.Constant souPPum( k=1); Fluid.Sources.Boundary_pT sinSerAmbSup( redeclare final package Medium = MediumSer, nPorts=1) if typ == Buildings.DHC.Types.DistrictSystemType.CombinedGeneration5 "Sink for service supply"; Fluid.Sources.MassFlowSource_T souSerAmbRet( redeclare final package Medium = MediumSer, m_flow=m_flow_nominal, nPorts=1) if typ == Buildings.DHC.Types.DistrictSystemType.CombinedGeneration5 "Source for service return"; Fluid.Sources.Boundary_pT sinSerHeaSup( redeclare final package Medium = MediumSerHea_a, nPorts=1) if typ <> Buildings.DHC.Types.DistrictSystemType.Cooling and typ <> Buildings.DHC.Types.DistrictSystemType.CombinedGeneration5 "Sink for service supply"; Fluid.Sources.MassFlowSource_T souSerHeaReat( redeclare final package Medium = MediumSer, m_flow=m_flow_nominal, nPorts=1) if typ <> Buildings.DHC.Types.DistrictSystemType.Cooling and typ <> Buildings.DHC.Types.DistrictSystemType.CombinedGeneration5 "Source for service return"; Fluid.Sources.Boundary_pT sinHeaWat( redeclare final package Medium =MediumBui, nPorts=nPorts_aHeaWat) if have_heaWat "Sink for heating water"; Fluid.Sources.Boundary_pT sinChiWat( redeclare final package Medium = MediumBui, nPorts=nPorts_aChiWat) if have_chiWat "Sink for chilled water"; Fluid.Sources.MassFlowSource_T souHeaWat( redeclare final package Medium = MediumBui, m_flow=m_flow_nominal, nPorts=nPorts_bHeaWat) if have_heaWat "Source for heating water"; Fluid.Sources.MassFlowSource_T souChiWat( redeclare final package Medium = MediumBui, m_flow=m_flow_nominal, nPorts=nPorts_bChiWat) if have_chiWat "Source for chilled water"; equation connect(port_aSerCoo, port_bSerCoo); connect(souPCoo.y,PCoo); connect(souPFan.y,PFan); connect(souPPum.y,PPum); connect(souPHea.y,PHea); connect(port_aSerAmb, sinSerAmbSup.ports[1]); connect(souSerAmbRet.ports[1], port_bSerAmb); connect(port_aSerHea, sinSerHeaSup.ports[1]); connect(souSerHeaReat.ports[1], port_bSerHea); connect(ports_aChiWat, sinChiWat.ports); connect(ports_aHeaWat, sinHeaWat.ports); connect(souChiWat.ports, ports_bChiWat); connect(souHeaWat.ports, ports_bHeaWat); end ETS;

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeCooling

Model of a sensible only two-pipe fan coil unit for cooling, computing a required chilled water mass flow rate

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeCooling

Information

This is a simplified model of a two-pipe fan coil unit for cooling. It is intended to be used

in a case where the room thermal loads are provided as time series: it therefore takes the load as an input, and
in conjunction with Buildings.DHC.Loads.BaseClasses.FlowDistribution: it therefore computes the water mass flow rate required to meet the load.

For the sake of computational performance, a PI controller is used instead of an inverse model of the heat exchanger to assess the required water mass flow rate. The controller output signal is mapped linearly to both,

the water mass flow rate, from zero to its nominal value, and
the air mass flow rate, from zero to its nominal value.

The controller tracks the load while the impact of an unmet load on the room air temperature is assessed with Buildings.DHC.Loads.BaseClasses.SimpleRoomODE.

Extends from Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit (Partial model for HVAC terminal unit).

Parameters

Type	Name	Default	Description
replaceable package Medium1		Water	Medium in the building distribution system
replaceable package Medium2		Air	Load side medium
Real	k	1	Gain of controller
Time	Ti	10	Time constant of integrator block [s]
Scaling
Real	facMul	1	Multiplier factor
Real	facMulZon	1	Zone multiplier factor
Configuration
Boolean	have_heaWat	false	Set to true if the system uses heating water
Boolean	have_chiWat	true	Set to true if the system uses chilled water
Boolean	have_chaOve	false	Set to true if the chilled water based heat exchanger operates in change-over
Boolean	have_eleHea	false	Set to true if the system has electric heating system
Boolean	have_eleCoo	false	Set to true if the system has electric cooling system
Boolean	have_heaPor	false	Set to true for heat ports on the load side
Boolean	have_fluPor	false	Set to true for fluid ports on the load side
Boolean	have_TSen	false	Set to true for measured temperature as an input
Boolean	have_QReq_flow	true	Set to true for required heat flow rate as an input
Boolean	have_weaBus	false	Set to true to use a weather bus
Boolean	have_fan	true	Set to true if fan power is computed
Boolean	have_pum	false	Set to true if pump power is computed
Boolean	have_speVar	true	Set to true for a variable speed fan (otherwise fan is always on)
Nominal condition
HeatFlowRate	QHea_flow_nominal	0	Nominal heating capacity (>=0) [W]
HeatFlowRate	QCoo_flow_nominal	0	Nominal cooling capacity (<=0) [W]
MassFlowRate	mHeaWat_flow_nominal	0	Heating water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mChiWat_flow_nominal	abs(QCoo_flow_nominal/cpChiW...	Chilled water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mLoaHea_flow_nominal	0	Load side mass flow rate at nominal conditions in heating mode [kg/s]
MassFlowRate	mLoaCoo_flow_nominal	0	Load side mass flow rate at nominal conditions in cooling mode [kg/s]
Temperature	T_aHeaWat_nominal	273.15 + 60	Heating water inlet temperature at nominal conditions [K]
Temperature	T_bHeaWat_nominal	T_aHeaWat_nominal - 22.2	Heating water outlet temperature at nominal conditions [K]
Temperature	T_aChiWat_nominal	273.15 + 7.2	Chilled water inlet temperature at nominal conditions [K]
Temperature	T_bChiWat_nominal	T_aChiWat_nominal + 5.6	Chilled water outlet temperature at nominal conditions [K]
Temperature	T_aLoaHea_nominal	273.15 + 21.1	Load side inlet temperature at nominal conditions in heating mode [K]
Temperature	T_aLoaCoo_nominal	273.15 + 26.7	Load side inlet temperature at nominal conditions in cooling mode [K]
MassFraction	w_aLoaCoo_nominal	0.011	Load side inlet humidity ratio at nominal conditions in cooling mode [1]
PressureDifference	dpLoa_nominal	250	Load side pressure drop [Pa]
HeatFlowRate	QEnv_flow_nominal		Nominal envelope heat loss (for room air temperature prediction) [W]
TemperatureDifference	dTEnv_nominal	15	Design temperature difference at which envelope heat loss is QEnv_flow_nominal [K]
Assumptions
Boolean	allowFlowReversal	false	Set to true to allow flow reversal in building distribution system
Boolean	allowFlowReversalLoa	false	Set to true to allow flow reversal on the load side

Connectors

Type	Name	Description
replaceable package Medium1		Medium in the building distribution system
replaceable package Medium2		Load side medium
input RealInput	TSen	Temperature (measured) [K]
input RealInput	TSetHea	Heating set point [K]
input RealInput	TSetCoo	Cooling set point [K]
input RealInput	QReqHea_flow	Required heat flow rate to meet heating set point (>=0) [W]
input RealInput	QReqCoo_flow	Required heat flow rate to meet cooling set point (<=0) [W]
output RealOutput	QActHea_flow	Heating heat flow rate transferred to the load (>=0) [W]
output RealOutput	QActCoo_flow	Cooling heat flow rate transferred to the load (<=0) [W]
output RealOutput	PHea	Power drawn by heating system [W]
output RealOutput	PCoo	Power drawn by cooling system [W]
output RealOutput	PFan	Power drawn by fans motors [W]
output RealOutput	PPum	Power drawn by pumps motors [W]
output RealOutput	mReqHeaWat_flow	Required heating water flow rate to meet heating set point [kg/s]
output RealOutput	mReqChiWat_flow	Required chilled water flow rate to meet cooling set point [kg/s]
FluidPort_a	port_aLoa	Fluid stream inlet port on the load side
FluidPort_b	port_bLoa	Fluid stream outlet port on the load side
HeatPort_b	heaPorCon	Heat port transferring convective heat to the load
HeatPort_b	heaPorRad	Heat port transferring radiative heat to the load
Bus	weaBus	Weather data bus
FluidPort_a	port_aHeaWat	Heating water inlet port
FluidPort_a	port_aChiWat	Chilled water inlet port
FluidPort_b	port_bHeaWat	Heating water outlet port
FluidPort_b	port_bChiWat	Chilled water outlet port

Modelica definition

model FanCoil2PipeCooling "Model of a sensible only two-pipe fan coil unit for cooling, computing a required chilled water mass flow rate" extends Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit( redeclare package Medium1=Buildings.Media.Water, redeclare package Medium2=Buildings.Media.Air, final have_heaPor=false, final have_fluPor=false, final have_fan=true, final have_heaWat=false, final have_chiWat=true, final have_QReq_flow=true, allowFlowReversal=false, final allowFlowReversalLoa=false, final have_chaOve=false, final have_eleHea=false, final have_eleCoo=false, final have_TSen=false, final have_weaBus=false, final have_pum=false, mChiWat_flow_nominal=abs( QCoo_flow_nominal/cpChiWat_nominal/(T_aChiWat_nominal-T_bChiWat_nominal))); import hexConfiguration=Buildings.Fluid.Types.HeatExchangerConfiguration; parameter Real k( min=0)=1 "Gain of controller"; parameter Modelica.Units.SI.Time Ti(min=Modelica.Constants.small) = 10 "Time constant of integrator block"; parameter Modelica.Units.SI.PressureDifference dpLoa_nominal(displayUnit="Pa")= 250 "Load side pressure drop"; final parameter hexConfiguration hexConCoo=hexConfiguration.CounterFlow "Cooling heat exchanger configuration"; parameter Boolean have_speVar=true "Set to true for a variable speed fan (otherwise fan is always on)"; parameter Modelica.Units.SI.HeatFlowRate QEnv_flow_nominal(min=0) "Nominal envelope heat loss (for room air temperature prediction)"; parameter Modelica.Units.SI.TemperatureDifference dTEnv_nominal = 15 "Design temperature difference at which envelope heat loss is QEnv_flow_nominal"; Buildings.Controls.OBC.CDL.Reals.PIDWithReset con( final k=k, final Ti=Ti, controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final reverseActing=true) "PI controller"; Buildings.Fluid.Movers.FlowControlled_m_flow fan( redeclare final package Medium=Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaCoo_flow_nominal, redeclare final Fluid.Movers.Data.Generic per, nominalValuesDefineDefaultPressureCurve=true, energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState, use_inputFilter=false, final dp_nominal=dpLoa_nominal) "Fan"; Fluid.HeatExchangers.WetCoilEffectivenessNTU hexWetNtu( redeclare final package Medium1=Medium1, redeclare final package Medium2=Medium2, final configuration=hexConCoo, final m1_flow_nominal=mChiWat_flow_nominal, final m2_flow_nominal=mLoaCoo_flow_nominal, final dp1_nominal=0, final dp2_nominal=0, use_Q_flow_nominal=true, final Q_flow_nominal=QCoo_flow_nominal, final T_a1_nominal=T_aChiWat_nominal, final T_a2_nominal=T_aLoaCoo_nominal, final allowFlowReversal1=allowFlowReversal, final allowFlowReversal2=allowFlowReversalLoa, final w_a2_nominal=w_aLoaCoo_nominal) "Cooling coil"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiMasFlo(k= mChiWat_flow_nominal) "Scale water flow rate"; Modelica.Blocks.Sources.RealExpression Q_flowCoo( final y=hexWetNtu.Q2_flow); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiFloNom2(k= mLoaCoo_flow_nominal) "Scale air flow rate"; Fluid.Sources.Boundary_pT sinAir( redeclare package Medium=Medium2, use_T_in=false, nPorts=1) "Sink for supply air"; Fluid.Sources.Boundary_pT retAir( redeclare package Medium=Medium2, use_T_in=true, nPorts=1) "Source for return air"; Buildings.DHC.Loads.BaseClasses.SimpleRoomODE TLoaODE( final dTEnv_nominal=dTEnv_nominal, TAir_start=297.15, final QEnv_flow_nominal=QEnv_flow_nominal) "Predicted room air temperature"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo(k=1/ QCoo_flow_nominal); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo1(k=1/ QCoo_flow_nominal); Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greThr( t=1E-4, h=0.5E-4) "Reset when demand rises from zero"; Fluid.FixedResistances.PressureDrop resLoa( redeclare final package Medium = Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaCoo_flow_nominal, final dp_nominal=dpLoa_nominal) "Load side pressure drop"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant one(k=1) "One constant"; Buildings.Controls.OBC.CDL.Logical.Sources.Constant con1(k=have_speVar); Buildings.Controls.OBC.CDL.Reals.Switch swi "Logical switch"; equation connect(gaiFloNom2.y,fan.m_flow_in); connect(con.y,gaiMasFlo.u); connect(fan.P,mulPFan.u); connect(fan.port_b, hexWetNtu.port_a2); connect(hexWetNtu.port_b2, sinAir.ports[1]); connect(Q_flowCoo.y,TLoaODE.QAct_flow); connect(TLoaODE.TAir,retAir.T_in); connect(gaiMasFlo.y,mulMasFloReqChiWat.u); connect(mulQReqCoo_flow.y,TLoaODE.QReq_flow); connect(Q_flowCoo.y,mulQActCoo_flow.u); connect(TSetCoo,TLoaODE.TSet); connect(mulQReqCoo_flow.y,gaiHeaFlo.u); connect(gaiHeaFlo.y,con.u_s); connect(con.u_m,gaiHeaFlo1.y); connect(Q_flowCoo.y,gaiHeaFlo1.u); connect(greThr.y,con.trigger); connect(gaiHeaFlo.y,greThr.u); connect(mulChiWatFloInl.port_b, hexWetNtu.port_a1); connect(hexWetNtu.port_b1, mulChiWatFloOut.port_a); connect(retAir.ports[1], resLoa.port_a); connect(resLoa.port_b, fan.port_a); connect(gaiFloNom2.u, swi.y); connect(con.y, swi.u1); connect(con1.y, swi.u2); connect(one.y, swi.u3); end FanCoil2PipeCooling;

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeHeating

Model of a two-pipe fan coil unit for heating, computing a required heating water mass flow rate

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeHeating

Information

This is a simplified model of a two-pipe fan coil unit for heating. It is intended to be used

in a case where the room thermal loads are provided as time series: it therefore takes the load as an input, and
in conjunction with Buildings.DHC.Loads.BaseClasses.FlowDistribution: it therefore computes the water mass flow rate required to meet the load.

the water mass flow rate, from zero to its nominal value, and
the air mass flow rate, from zero to its nominal value.

The controller tracks the load while the impact of an unmet load on the room air temperature is assessed with Buildings.DHC.Loads.BaseClasses.SimpleRoomODE.

Extends from Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit (Partial model for HVAC terminal unit).

Parameters

Type	Name	Default	Description
replaceable package Medium1		Water	Medium in the building distribution system
replaceable package Medium2		Air	Load side medium
Real	k	1	Gain of controller
Time	Ti	10	Time constant of integrator block [s]
Scaling
Real	facMul	1	Multiplier factor
Real	facMulZon	1	Zone multiplier factor
Configuration
Boolean	have_heaWat	true	Set to true if the system uses heating water
Boolean	have_chiWat	false	Set to true if the system uses chilled water
Boolean	have_chaOve	false	Set to true if the chilled water based heat exchanger operates in change-over
Boolean	have_eleHea	false	Set to true if the system has electric heating system
Boolean	have_eleCoo	false	Set to true if the system has electric cooling system
Boolean	have_heaPor	false	Set to true for heat ports on the load side
Boolean	have_fluPor	false	Set to true for fluid ports on the load side
Boolean	have_TSen	false	Set to true for measured temperature as an input
Boolean	have_QReq_flow	true	Set to true for required heat flow rate as an input
Boolean	have_weaBus	false	Set to true to use a weather bus
Boolean	have_fan	true	Set to true if fan power is computed
Boolean	have_pum	false	Set to true if pump power is computed
Boolean	have_speVar	true	Set to true for a variable speed fan (otherwise fan is always on)
Nominal condition
HeatFlowRate	QHea_flow_nominal	0	Nominal heating capacity (>=0) [W]
HeatFlowRate	QCoo_flow_nominal	0	Nominal cooling capacity (<=0) [W]
MassFlowRate	mHeaWat_flow_nominal	abs(QHea_flow_nominal/cpHeaW...	Heating water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mChiWat_flow_nominal	0	Chilled water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mLoaHea_flow_nominal	0	Load side mass flow rate at nominal conditions in heating mode [kg/s]
MassFlowRate	mLoaCoo_flow_nominal	0	Load side mass flow rate at nominal conditions in cooling mode [kg/s]
Temperature	T_aHeaWat_nominal	273.15 + 60	Heating water inlet temperature at nominal conditions [K]
Temperature	T_bHeaWat_nominal	T_aHeaWat_nominal - 22.2	Heating water outlet temperature at nominal conditions [K]
Temperature	T_aChiWat_nominal	273.15 + 7.2	Chilled water inlet temperature at nominal conditions [K]
Temperature	T_bChiWat_nominal	T_aChiWat_nominal + 5.6	Chilled water outlet temperature at nominal conditions [K]
Temperature	T_aLoaHea_nominal	273.15 + 21.1	Load side inlet temperature at nominal conditions in heating mode [K]
Temperature	T_aLoaCoo_nominal	273.15 + 26.7	Load side inlet temperature at nominal conditions in cooling mode [K]
MassFraction	w_aLoaCoo_nominal	0.011	Load side inlet humidity ratio at nominal conditions in cooling mode [1]
PressureDifference	dpLoa_nominal	250	Load side pressure drop [Pa]
Assumptions
Boolean	allowFlowReversal	false	Set to true to allow flow reversal in building distribution system
Boolean	allowFlowReversalLoa	false	Set to true to allow flow reversal on the load side

Connectors

Type	Name	Description
replaceable package Medium1		Medium in the building distribution system
replaceable package Medium2		Load side medium
input RealInput	TSen	Temperature (measured) [K]
input RealInput	TSetHea	Heating set point [K]
input RealInput	TSetCoo	Cooling set point [K]
input RealInput	QReqHea_flow	Required heat flow rate to meet heating set point (>=0) [W]
input RealInput	QReqCoo_flow	Required heat flow rate to meet cooling set point (<=0) [W]
output RealOutput	QActHea_flow	Heating heat flow rate transferred to the load (>=0) [W]
output RealOutput	QActCoo_flow	Cooling heat flow rate transferred to the load (<=0) [W]
output RealOutput	PHea	Power drawn by heating system [W]
output RealOutput	PCoo	Power drawn by cooling system [W]
output RealOutput	PFan	Power drawn by fans motors [W]
output RealOutput	PPum	Power drawn by pumps motors [W]
output RealOutput	mReqHeaWat_flow	Required heating water flow rate to meet heating set point [kg/s]
output RealOutput	mReqChiWat_flow	Required chilled water flow rate to meet cooling set point [kg/s]
FluidPort_a	port_aLoa	Fluid stream inlet port on the load side
FluidPort_b	port_bLoa	Fluid stream outlet port on the load side
HeatPort_b	heaPorCon	Heat port transferring convective heat to the load
HeatPort_b	heaPorRad	Heat port transferring radiative heat to the load
Bus	weaBus	Weather data bus
FluidPort_a	port_aHeaWat	Heating water inlet port
FluidPort_a	port_aChiWat	Chilled water inlet port
FluidPort_b	port_bHeaWat	Heating water outlet port
FluidPort_b	port_bChiWat	Chilled water outlet port

Modelica definition

model FanCoil2PipeHeating "Model of a two-pipe fan coil unit for heating, computing a required heating water mass flow rate" extends Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit( redeclare package Medium1=Buildings.Media.Water, redeclare package Medium2=Buildings.Media.Air, final have_heaPor=false, final have_fluPor=false, final have_fan=true, final have_heaWat=true, final have_chiWat=false, final have_QReq_flow=true, allowFlowReversal=false, final allowFlowReversalLoa=false, final have_chaOve=false, final have_eleHea=false, final have_eleCoo=false, final have_TSen=false, final have_weaBus=false, final have_pum=false, mHeaWat_flow_nominal=abs( QHea_flow_nominal/cpHeaWat_nominal/(T_aHeaWat_nominal-T_bHeaWat_nominal))); import hexConfiguration=Buildings.Fluid.Types.HeatExchangerConfiguration; parameter Real k( min=0)=1 "Gain of controller"; parameter Modelica.Units.SI.Time Ti(min=Modelica.Constants.small) = 10 "Time constant of integrator block"; parameter Modelica.Units.SI.PressureDifference dpLoa_nominal(displayUnit="Pa")= 250 "Load side pressure drop"; final parameter hexConfiguration hexConHea=hexConfiguration.CounterFlow "Heating heat exchanger configuration"; parameter Boolean have_speVar=true "Set to true for a variable speed fan (otherwise fan is always on)"; Buildings.Fluid.Movers.FlowControlled_m_flow fan( redeclare final package Medium=Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaHea_flow_nominal, redeclare final Fluid.Movers.Data.Generic per, nominalValuesDefineDefaultPressureCurve=true, energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState, use_inputFilter=false, final dp_nominal=dpLoa_nominal) "Fan"; Buildings.Controls.OBC.CDL.Reals.PIDWithReset con( final k=k, final Ti=Ti, controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final reverseActing=true) "PI controller"; Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU hex( redeclare final package Medium1=Medium1, redeclare final package Medium2=Medium2, final configuration=hexConHea, final m1_flow_nominal=mHeaWat_flow_nominal, final m2_flow_nominal=mLoaHea_flow_nominal, final dp1_nominal=0, final dp2_nominal=0, final Q_flow_nominal=QHea_flow_nominal, final T_a1_nominal=T_aHeaWat_nominal, final T_a2_nominal=T_aLoaHea_nominal, final allowFlowReversal1=allowFlowReversal, final allowFlowReversal2=allowFlowReversalLoa) "Heating coil"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiMasFlo(k= mHeaWat_flow_nominal) "Scale water flow rate"; Modelica.Blocks.Sources.RealExpression Q_flowHea( y=hex.Q2_flow); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiFloNom2(k= mLoaHea_flow_nominal) "Scale air flow rate"; Fluid.Sources.Boundary_pT sinAir( redeclare package Medium=Medium2, use_p_in=false, nPorts=1) "Sink for supply air"; Fluid.Sources.Boundary_pT retAir( redeclare package Medium=Medium2, p(displayUnit="Pa"), use_T_in=true, nPorts=1) "Source for return air"; Buildings.DHC.Loads.BaseClasses.SimpleRoomODE TLoaODE( dTEnv_nominal=25, TAir_start=293.15, QEnv_flow_nominal=QHea_flow_nominal) "Predicted room air temperature"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo(k=1/ QHea_flow_nominal); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo1(k=1/ QHea_flow_nominal); Buildings.Controls.OBC.CDL.Reals.Switch swi "Logical switch"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant one( k=1) "One constant"; Buildings.Controls.OBC.CDL.Logical.Sources.Constant con1( k=have_speVar); Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greThr( t=1E-4, h=0.5E-4) "Reset when demand rises from zero"; Fluid.FixedResistances.PressureDrop resLoa( redeclare final package Medium = Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaHea_flow_nominal, final dp_nominal=dpLoa_nominal) "Load side pressure drop"; equation connect(gaiFloNom2.y,fan.m_flow_in); connect(con.y,gaiMasFlo.u); connect(gaiMasFlo.y,mulMasFloReqHeaWat.u); connect(fan.P,mulPFan.u); connect(Q_flowHea.y,mulQActHea_flow.u); connect(fan.port_b,hex.port_a2); connect(hex.port_b2,sinAir.ports[1]); connect(TSetHea,TLoaODE.TSet); connect(TLoaODE.TAir,retAir.T_in); connect(gaiHeaFlo.y,con.u_s); connect(con.u_m,gaiHeaFlo1.y); connect(swi.y,gaiFloNom2.u); connect(con.y,swi.u1); connect(one.y,swi.u3); connect(con1.y,swi.u2); connect(mulQReqHea_flow.y,gaiHeaFlo.u); connect(mulQReqHea_flow.y,TLoaODE.QReq_flow); connect(Q_flowHea.y,gaiHeaFlo1.u); connect(Q_flowHea.y,TLoaODE.QAct_flow); connect(mulHeaWatFloInl.port_b,hex.port_a1); connect(hex.port_b1,mulHeaWatFloOut.port_a); connect(gaiHeaFlo.y,greThr.u); connect(greThr.y,con.trigger); connect(retAir.ports[1], resLoa.port_a); connect(resLoa.port_b, fan.port_a); end FanCoil2PipeHeating;

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeHeatingValve

Model of a two-pipe fan coil unit for heating, with a two-way control valve

Buildings.DHC.Loads.BaseClasses.Validation.BaseClasses.FanCoil2PipeHeatingValve

Information

This is a simplified model of a two-pipe fan coil unit for heating. It is intended to be used in a case where the room thermal loads are provided as time series, and hence it takes the load as an input.

A PI controller tracks the load. The controller output signal is mapped linearly to both,

the opening of a two-way control valve, and
the air mass flow rate, from zero to its nominal value.

The impact of an unmet load on the room air temperature is assessed with Buildings.DHC.Loads.BaseClasses.SimpleRoomODE.

Extends from Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit (Partial model for HVAC terminal unit).

Parameters

Type	Name	Default	Description
replaceable package Medium1		Water	Medium in the building distribution system
replaceable package Medium2		Air	Load side medium
Boolean	have_speVar	true	Set to true for a variable speed fan (otherwise fan is always on)
PressureDifference	dpSou_nominal	30000	Nominal pressure drop on source side [Pa]
Scaling
Real	facMul	1	Multiplier factor
Real	facMulZon	1	Zone multiplier factor
Configuration
Boolean	have_heaWat	true	Set to true if the system uses heating water
Boolean	have_chiWat	false	Set to true if the system uses chilled water
Boolean	have_chaOve	false	Set to true if the chilled water based heat exchanger operates in change-over
Boolean	have_eleHea	false	Set to true if the system has electric heating system
Boolean	have_eleCoo	false	Set to true if the system has electric cooling system
Boolean	have_heaPor	false	Set to true for heat ports on the load side
Boolean	have_fluPor	false	Set to true for fluid ports on the load side
Boolean	have_TSen	false	Set to true for measured temperature as an input
Boolean	have_QReq_flow	true	Set to true for required heat flow rate as an input
Boolean	have_weaBus	false	Set to true to use a weather bus
Boolean	have_fan	true	Set to true if fan power is computed
Boolean	have_pum	false	Set to true if pump power is computed
Nominal condition
HeatFlowRate	QHea_flow_nominal	0	Nominal heating capacity (>=0) [W]
HeatFlowRate	QCoo_flow_nominal	0	Nominal cooling capacity (<=0) [W]
MassFlowRate	mHeaWat_flow_nominal	abs(QHea_flow_nominal/cpHeaW...	Heating water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mChiWat_flow_nominal	0	Chilled water mass flow rate at nominal conditions [kg/s]
MassFlowRate	mLoaHea_flow_nominal	0	Load side mass flow rate at nominal conditions in heating mode [kg/s]
MassFlowRate	mLoaCoo_flow_nominal	0	Load side mass flow rate at nominal conditions in cooling mode [kg/s]
Temperature	T_aHeaWat_nominal	273.15 + 60	Heating water inlet temperature at nominal conditions [K]
Temperature	T_bHeaWat_nominal	T_aHeaWat_nominal - 22.2	Heating water outlet temperature at nominal conditions [K]
Temperature	T_aChiWat_nominal	273.15 + 7.2	Chilled water inlet temperature at nominal conditions [K]
Temperature	T_bChiWat_nominal	T_aChiWat_nominal + 5.6	Chilled water outlet temperature at nominal conditions [K]
Temperature	T_aLoaHea_nominal	273.15 + 21.1	Load side inlet temperature at nominal conditions in heating mode [K]
Temperature	T_aLoaCoo_nominal	273.15 + 26.7	Load side inlet temperature at nominal conditions in cooling mode [K]
MassFraction	w_aLoaCoo_nominal	0.011	Load side inlet humidity ratio at nominal conditions in cooling mode [1]
PressureDifference	dpLoa_nominal	250	Load side pressure drop [Pa]
Assumptions
Boolean	allowFlowReversal	false	Set to true to allow flow reversal in building distribution system
Boolean	allowFlowReversalLoa	false	Set to true to allow flow reversal on the load side

Connectors

Type	Name	Description
replaceable package Medium1		Medium in the building distribution system
replaceable package Medium2		Load side medium
input RealInput	TSen	Temperature (measured) [K]
input RealInput	TSetHea	Heating set point [K]
input RealInput	TSetCoo	Cooling set point [K]
input RealInput	QReqHea_flow	Required heat flow rate to meet heating set point (>=0) [W]
input RealInput	QReqCoo_flow	Required heat flow rate to meet cooling set point (<=0) [W]
output RealOutput	QActHea_flow	Heating heat flow rate transferred to the load (>=0) [W]
output RealOutput	QActCoo_flow	Cooling heat flow rate transferred to the load (<=0) [W]
output RealOutput	PHea	Power drawn by heating system [W]
output RealOutput	PCoo	Power drawn by cooling system [W]
output RealOutput	PFan	Power drawn by fans motors [W]
output RealOutput	PPum	Power drawn by pumps motors [W]
output RealOutput	mReqHeaWat_flow	Required heating water flow rate to meet heating set point [kg/s]
output RealOutput	mReqChiWat_flow	Required chilled water flow rate to meet cooling set point [kg/s]
FluidPort_a	port_aLoa	Fluid stream inlet port on the load side
FluidPort_b	port_bLoa	Fluid stream outlet port on the load side
HeatPort_b	heaPorCon	Heat port transferring convective heat to the load
HeatPort_b	heaPorRad	Heat port transferring radiative heat to the load
Bus	weaBus	Weather data bus
FluidPort_a	port_aHeaWat	Heating water inlet port
FluidPort_a	port_aChiWat	Chilled water inlet port
FluidPort_b	port_bHeaWat	Heating water outlet port
FluidPort_b	port_bChiWat	Chilled water outlet port

Modelica definition

model FanCoil2PipeHeatingValve "Model of a two-pipe fan coil unit for heating, with a two-way control valve" extends Buildings.DHC.Loads.BaseClasses.PartialTerminalUnit( redeclare package Medium1=Buildings.Media.Water, redeclare package Medium2=Buildings.Media.Air, final have_heaPor=false, final have_fluPor=false, final have_fan=true, final have_heaWat=true, final have_chiWat=false, final have_QReq_flow=true, final allowFlowReversal=false, final allowFlowReversalLoa=false, final have_chaOve=false, final have_eleHea=false, final have_eleCoo=false, final have_TSen=false, final have_weaBus=false, final have_pum=false, final mHeaWat_flow_nominal=abs( QHea_flow_nominal/cpHeaWat_nominal/(T_aHeaWat_nominal-T_bHeaWat_nominal))); import hexConfiguration=Buildings.Fluid.Types.HeatExchangerConfiguration; final parameter hexConfiguration hexConHea=hexConfiguration.CounterFlow "Heating heat exchanger configuration"; parameter Boolean have_speVar=true "Set to true for a variable speed fan (otherwise fan is always on)"; parameter Modelica.Units.SI.PressureDifference dpLoa_nominal(displayUnit="Pa")= 250 "Load side pressure drop"; parameter Modelica.Units.SI.PressureDifference dpSou_nominal=30000 "Nominal pressure drop on source side"; Buildings.Fluid.Movers.FlowControlled_m_flow fan( redeclare final package Medium=Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaHea_flow_nominal, redeclare final Fluid.Movers.Data.Generic per, addPowerToMedium=true, nominalValuesDefineDefaultPressureCurve=true, energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState, use_inputFilter=false, final dp_nominal=dpLoa_nominal) "Fan"; Buildings.Controls.OBC.CDL.Reals.PID con( Ti=10, yMax=1, controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, reverseActing=true, yMin=0) "PI controller"; Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU hex( redeclare final package Medium1=Medium1, redeclare final package Medium2=Medium2, final configuration=hexConHea, final m1_flow_nominal=mHeaWat_flow_nominal, final m2_flow_nominal=mLoaHea_flow_nominal, final dp1_nominal=0, final dp2_nominal=0, final Q_flow_nominal=QHea_flow_nominal, final T_a1_nominal=T_aHeaWat_nominal, final T_a2_nominal=T_aLoaHea_nominal, final allowFlowReversal1=allowFlowReversal, final allowFlowReversal2=allowFlowReversalLoa) "Heating coil"; Modelica.Blocks.Sources.RealExpression Q_flowHea( y=hex.Q2_flow); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiFloNom2(k= mLoaHea_flow_nominal); Fluid.Sources.Boundary_pT sinAir( redeclare package Medium=Medium2, use_T_in=false, nPorts=1) "Sink for supply air"; Fluid.Sources.Boundary_pT retAir( redeclare package Medium=Medium2, use_T_in=true, nPorts=1) "Source for return air"; Buildings.DHC.Loads.BaseClasses.SimpleRoomODE TLoaODE( dTEnv_nominal=25, TAir_start=293.15, QEnv_flow_nominal=QHea_flow_nominal) "Predicted room air temperature"; Fluid.Actuators.Valves.TwoWayEqualPercentage val( redeclare final package Medium=Medium1, final m_flow_nominal=mHeaWat_flow_nominal, dpValve_nominal=10000, use_inputFilter=false, final allowFlowReversal=allowFlowReversal, dpFixed_nominal=dpSou_nominal-10000); Fluid.Sensors.MassFlowRate senMasFlo( redeclare final package Medium=Medium1, final allowFlowReversal=allowFlowReversal); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo(k=1/ QHea_flow_nominal); Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gaiHeaFlo1(k=1/ QHea_flow_nominal); Buildings.Controls.OBC.CDL.Reals.Sources.Constant one( k=1) "One constant"; Buildings.Controls.OBC.CDL.Logical.Sources.Constant con1( k=have_speVar); Buildings.Controls.OBC.CDL.Reals.Switch swi "Logical switch"; Fluid.FixedResistances.PressureDrop resLoa( redeclare final package Medium = Medium2, final allowFlowReversal=allowFlowReversalLoa, final m_flow_nominal=mLoaHea_flow_nominal, final dp_nominal=dpLoa_nominal) "Load side pressure drop"; equation connect(gaiFloNom2.y,fan.m_flow_in); connect(fan.P,mulPFan.u); connect(Q_flowHea.y,mulQActHea_flow.u); connect(fan.port_b,hex.port_a2); connect(hex.port_b2,sinAir.ports[1]); connect(TSetHea,TLoaODE.TSet); connect(mulQReqHea_flow.y,TLoaODE.QReq_flow); connect(Q_flowHea.y,TLoaODE.QAct_flow); connect(TLoaODE.TAir,retAir.T_in); connect(hex.port_b1,val.port_a); connect(val.port_b,senMasFlo.port_a); connect(con.y,val.y); connect(senMasFlo.m_flow,mulMasFloReqHeaWat.u); connect(mulQReqHea_flow.y,gaiHeaFlo.u); connect(gaiHeaFlo.y,con.u_s); connect(Q_flowHea.y,gaiHeaFlo1.u); connect(con.u_m,gaiHeaFlo1.y); connect(gaiFloNom2.u,swi.y); connect(con.y,swi.u1); connect(con1.y,swi.u2); connect(one.y,swi.u3); connect(senMasFlo.port_b,mulHeaWatFloOut.port_a); connect(mulHeaWatFloInl.port_b,hex.port_a1); connect(retAir.ports[1], resLoa.port_a); connect(resLoa.port_b, fan.port_a); end FanCoil2PipeHeatingValve;