Buildings.Templates.Components.Coils
Coil models
Information
This package contains models for heating and cooling coils.
Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).
Package Content
| Name | Description |
|---|---|
 ElectricHeating
|
Modulating electric heating coil |
| EvaporatorMultiStage
|
Evaporator coil with multi-stage compressor |
| EvaporatorVariableSpeed
|
Evaporator coil with variable speed compressor |
 None
|
No coil |
| WaterBasedCooling
|
Chilled water coil |
| WaterBasedHeating
|
Hot water coil |
Buildings.Templates.Components.Coils.ElectricHeating
Modulating electric heating coil
Information
This is a model for a modulating electric heating coil.
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
Modelica definition
model ElectricHeating "Modulating electric heating coil"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.ElectricHeating,
final typVal=Buildings.Templates.Components.Types.Valve.None);
Buildings.Fluid.HeatExchangers.HeaterCooler_u hex(
redeclare final package Medium = MediumAir,
final Q_flow_nominal=dat.Q_flow_nominal,
final m_flow_nominal=dat.mAir_flow_nominal,
final dp_nominal=dat.dpAir_nominal,
final energyDynamics=energyDynamics,
final tau=tau,
final allowFlowReversal=allowFlowReversalAir,
final show_T=show_T)
"Heat exchanger";
equation
connect(port_a, hex.port_a);
connect(hex.port_b, port_b);
connect(bus.y, hex.u);
end ElectricHeating;
Buildings.Templates.Components.Coils.EvaporatorMultiStage
Evaporator coil with multi-stage compressor
Information
This is a model for a direct expansion cooling coil with a
multi-stage compressor.
The compressor stage is selected with the control
signal y (integer between 0 and the number
of stages).
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| Boolean | have_dryCon | true | Set to true for air-cooled condenser, false for evaporative condenser |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
Modelica definition
model EvaporatorMultiStage
"Evaporator coil with multi-stage compressor"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.EvaporatorMultiStage,
final typVal=Buildings.Templates.Components.Types.Valve.None);
parameter Boolean have_dryCon = true
"Set to true for air-cooled condenser, false for evaporative condenser";
Buildings.Fluid.DXSystems.Cooling.AirSource.MultiStage hex(
redeclare final package Medium = MediumAir,
final datCoi=dat.datCoi,
final dp_nominal=dpAir_nominal,
final energyDynamics=energyDynamics,
final tau=tau,
final allowFlowReversal=allowFlowReversalAir,
final show_T=show_T)
"Heat exchanger";
Modelica.Blocks.Routing.RealPassThrough TWetBul if not have_dryCon;
Modelica.Blocks.Routing.RealPassThrough TDry if have_dryCon;
equation
connect(port_a, hex.port_a);
connect(hex.port_b, port_b);
connect(busWea.TWetBul, TWetBul.u);
connect(busWea.TDryBul, TDry.u);
connect(TWetBul.y, hex.TOut);
connect(TDry.y, hex.TOut);
connect(bus.y, hex.stage);
end EvaporatorMultiStage;
Buildings.Templates.Components.Coils.EvaporatorVariableSpeed
Evaporator coil with variable speed compressor
Information
This is a model for a direct expansion cooling coil with a
variable speed compressor.
The compressor speed is modulated with the fractional speed
signal y (real between 0 and 1).
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| Boolean | have_dryCon | true | Set to true for air-cooled condenser, false for evaporative condenser |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
Modelica definition
model EvaporatorVariableSpeed
"Evaporator coil with variable speed compressor"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.EvaporatorVariableSpeed,
final typVal=Buildings.Templates.Components.Types.Valve.None);
parameter Boolean have_dryCon = true
"Set to true for air-cooled condenser, false for evaporative condenser";
Buildings.Fluid.DXSystems.Cooling.AirSource.VariableSpeed hex(
redeclare final package Medium = MediumAir,
final datCoi=dat.datCoi,
final minSpeRat=dat.datCoi.minSpeRat,
final dp_nominal=dpAir_nominal,
final energyDynamics=energyDynamics,
final tau=tau,
final allowFlowReversal=allowFlowReversalAir,
final show_T=show_T)
"Heat exchanger";
Modelica.Blocks.Routing.RealPassThrough TWetBul if not have_dryCon;
Modelica.Blocks.Routing.RealPassThrough TDry if have_dryCon;
equation
connect(port_a, hex.port_a);
connect(hex.port_b, port_b);
connect(busWea.TWetBul, TWetBul.u);
connect(busWea.TDryBul, TDry.u);
connect(TWetBul.y, hex.TOut);
connect(TDry.y, hex.TOut);
connect(bus.y, hex.speRat);
end EvaporatorVariableSpeed;
Buildings.Templates.Components.Coils.None
No coil
Information
This is a direct fluid pass-through model to represent a configuration with no coil.
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
Modelica definition
model None "No coil"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.None,
final typVal=Buildings.Templates.Components.Types.Valve.None);
equation
connect(port_a, port_b);
end None;
Buildings.Templates.Components.Coils.WaterBasedCooling
Chilled water coil
Information
This is a model for a chilled water coil with an optional
modulating valve.
The valve position is modulated with the fractional opening
signal y (real between 0 and 1).
If no valve is used, no signal is required.
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| replaceable package MediumChiWat | Buildings.Media.Water | Source side medium | |
| WetCoilEffectivenessNTU | hex | hex(configuration=Buildings.... | Heat exchanger |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| replaceable package MediumSou | Source-side medium | |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
| replaceable package MediumChiWat | Source side medium | |
Modelica definition
model WaterBasedCooling "Chilled water coil"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.WaterBasedCooling,
typVal=Buildings.Templates.Components.Types.Valve.TwoWayModulating,
redeclare final package MediumSou = MediumChiWat);
replaceable package MediumChiWat=Buildings.Media.Water
"Source side medium";
final parameter Modelica.Units.SI.MassFlowRate mWat_flow_nominal=
dat.mWat_flow_nominal
"Liquid mass flow rate";
final parameter Modelica.Units.SI.PressureDifference dpWat_nominal=
dat.dpWat_nominal
"Liquid pressure drop across coil";
final parameter Modelica.Units.SI.PressureDifference dpValve_nominal=
dat.dpValve_nominal
"Nominal pressure drop across fully open valve";
Buildings.Templates.Components.Actuators.Valve val(
redeclare final package Medium = MediumChiWat,
final typ=typVal,
final energyDynamics=energyDynamics,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversalLiq,
final show_T=show_T,
final dat=datVal)
"Valve";
replaceable Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU hex(
configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CounterFlow,
final use_Q_flow_nominal=true,
final Q_flow_nominal=Q_flow_nominal,
final T_a1_nominal=dat.TWatEnt_nominal,
final T_a2_nominal=dat.TAirEnt_nominal,
final w_a2_nominal=dat.wAirEnt_nominal,
final dp1_nominal=if val.typ==Buildings.Templates.Components.Types.Valve.None
then dpWat_nominal else 0,
final dp2_nominal=dpAir_nominal)
constrainedby Buildings.Fluid.Interfaces.PartialFourPortInterface(
redeclare final package Medium1 = MediumChiWat,
redeclare final package Medium2 = MediumAir,
final m1_flow_nominal=mWat_flow_nominal,
final m2_flow_nominal=mAir_flow_nominal,
final allowFlowReversal1=allowFlowReversalLiq,
final allowFlowReversal2=allowFlowReversalAir,
final show_T=show_T)
"Heat exchanger";
Buildings.Fluid.FixedResistances.Junction jun(
redeclare final package Medium = MediumChiWat,
final m_flow_nominal=mWat_flow_nominal*{1,-1,-1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
dp_nominal=fill(0, 3),
final portFlowDirection_1=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Entering,
final portFlowDirection_2=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Leaving,
final portFlowDirection_3=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Leaving)
if typVal==Buildings.Templates.Components.Types.Valve.ThreeWayModulating
"Junction";
Buildings.Templates.Components.Routing.PassThroughFluid pas(
redeclare final package Medium = MediumChiWat,
final allowFlowReversal=allowFlowReversalLiq)
if typVal <> Buildings.Templates.Components.Types.Valve.ThreeWayModulating
"Direct pass through";
equation
connect(port_a,hex. port_a2);
connect(hex.port_b2, port_b);
connect(val.port_a, hex.port_b1);
connect(val.port_b, port_bSou);
connect(val.portByp_a, jun.port_3);
connect(jun.port_2, hex.port_a1);
connect(port_aSou, jun.port_1);
connect(port_aSou, pas.port_a);
connect(pas.port_b, hex.port_a1);
connect(val.bus, bus);
end WaterBasedCooling;
Buildings.Templates.Components.Coils.WaterBasedHeating
Hot water coil
Information
This is a model for a hot water coil with an optional
modulating valve.
The valve position is modulated with the fractional opening
signal y (real between 0 and 1).
If no valve is used, no signal is required.
Extends from Buildings.Templates.Components.Interfaces.PartialCoil (Interface class for coil).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package MediumAir | Air | Air medium | |
| replaceable package MediumSou | Water | Source-side medium | |
| Coil | dat | Design and operating parameters | |
| replaceable package MediumHeaWat | Buildings.Media.Water | Source side medium | |
| DryCoilEffectivenessNTU | hex | hex(configuration=Buildings.... | Heat exchanger |
| Configuration | |||
| Coil | typ | Buildings.Templates.Componen... | Equipment type |
| Valve | typVal | Buildings.Templates.Componen... | Type of valve |
| Advanced | |||
| MassFlowRate | m_flow_small | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow [kg/s] |
| Diagnostics | |||
| Boolean | show_T | false | = true, if actual temperature at port is computed |
| Dynamics | |||
| Nominal condition | |||
| Time | tau | 20 | Time constant at nominal flow [s] |
| Conservation equations | |||
| Dynamics | energyDynamics | Modelica.Fluid.Types.Dynamic... | Type of energy balance: dynamic (3 initialization options) or steady state |
| Assumptions | |||
| Boolean | allowFlowReversalAir | true | = true to allow flow reversal, false restricts to design direction - Air side |
| Boolean | allowFlowReversalLiq | true | = true to allow flow reversal, false restricts to design direction - CHW and HW side |
Connectors
| Type | Name | Description |
|---|---|---|
| FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
| replaceable package MediumSou | Source-side medium | |
| FluidPort_a | port_aSou | Fluid connector a (positive design flow direction is from port_a to port_b) |
| FluidPort_b | port_bSou | Fluid connector b (positive design flow direction is from port_a to port_b) |
| Bus | busWea | Weather bus |
| Bus | bus | Control bus |
| replaceable package MediumHeaWat | Source side medium | |
Modelica definition
model WaterBasedHeating "Hot water coil"
extends Buildings.Templates.Components.Interfaces.PartialCoil(
final typ=Buildings.Templates.Components.Types.Coil.WaterBasedHeating,
typVal=Buildings.Templates.Components.Types.Valve.TwoWayModulating,
redeclare final package MediumSou = MediumHeaWat);
replaceable package MediumHeaWat=Buildings.Media.Water
"Source side medium";
final parameter Modelica.Units.SI.MassFlowRate mWat_flow_nominal=
dat.mWat_flow_nominal
"Liquid mass flow rate";
final parameter Modelica.Units.SI.PressureDifference dpWat_nominal=
dat.dpWat_nominal
"Liquid pressure drop across coil";
final parameter Modelica.Units.SI.PressureDifference dpValve_nominal=
dat.dpValve_nominal
"Nominal pressure drop across fully open valve";
Buildings.Templates.Components.Actuators.Valve val(
final typ=typVal,
redeclare final package Medium = MediumHeaWat,
final energyDynamics=energyDynamics,
use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState,
final allowFlowReversal=allowFlowReversalLiq,
final show_T=show_T,
final dat=datVal)
"Valve";
replaceable Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU hex(
configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CounterFlow,
final use_Q_flow_nominal=true,
final Q_flow_nominal=Q_flow_nominal,
final T_a1_nominal=dat.TWatEnt_nominal,
final T_a2_nominal=dat.TAirEnt_nominal,
final dp1_nominal=if val.typ==Buildings.Templates.Components.Types.Valve.None
then dpWat_nominal else 0,
final dp2_nominal=dpAir_nominal)
constrainedby Buildings.Fluid.Interfaces.PartialFourPortInterface(
redeclare final package Medium1 = MediumHeaWat,
redeclare final package Medium2 = MediumAir,
final m1_flow_nominal=mWat_flow_nominal,
final m2_flow_nominal=mAir_flow_nominal,
final allowFlowReversal1=allowFlowReversalLiq,
final allowFlowReversal2=allowFlowReversalAir,
final show_T=show_T)
"Heat exchanger";
Buildings.Templates.Components.Routing.PassThroughFluid pas(
redeclare final package Medium = MediumHeaWat,
final allowFlowReversal=allowFlowReversalLiq)
if typVal <> Buildings.Templates.Components.Types.Valve.ThreeWayModulating
"Direct pass through";
Buildings.Fluid.FixedResistances.Junction jun(
redeclare final package Medium=MediumHeaWat,
final m_flow_nominal=mWat_flow_nominal * {1, -1, -1},
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
dp_nominal=fill(0, 3),
final portFlowDirection_1=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Entering,
final portFlowDirection_2=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Leaving,
final portFlowDirection_3=if allowFlowReversal then
Modelica.Fluid.Types.PortFlowDirection.Bidirectional
else Modelica.Fluid.Types.PortFlowDirection.Leaving)
if typVal==Buildings.Templates.Components.Types.Valve.ThreeWayModulating
"Junction";
equation
connect(port_a,hex. port_a2);
connect(hex.port_b2, port_b);
connect(val.port_a, hex.port_b1);
connect(val.port_b, port_bSou);
connect(port_aSou, pas.port_a);
connect(pas.port_b, hex.port_a1);
connect(jun.port_2, hex.port_a1);
connect(port_aSou, jun.port_1);
connect(val.portByp_a, jun.port_3);
connect(bus, val.bus);
end WaterBasedHeating;