Buildings.Obsolete.DHC.ETS.Combined.Controls

Package with control models

Information

This package contains controllers for models in Buildings.Obsolete.DHC.ETS.Combined.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
Borefield	Borefield controller
Chiller	Chiller controller
HeatExchanger	District heat exchanger controller
SideCold	Control block for cold side
SideHot	Control block for hot side
Supervisory	Supervisory controller
BaseClasses	Package with base classes for Buildings.Obsolete.DHC.ETS.Combined.Controls

Buildings.Obsolete.DHC.ETS.Combined.Controls.Borefield

Borefield controller

Buildings.Obsolete.DHC.ETS.Combined.Controls.Borefield

Information

This block implements the control logic for the borefield system. The main control signal u is yielded by the hot side or cold side controller, see for instance Buildings.Obsolete.DHC.ETS.Combined.Controls.SideHot.

The system is enabled when

the main control signal is greater than zero,
the return position of at least one isolation valve is greater than 90%.

When the system is enabled,

the input signal is mapped to modulate in sequence the mixing valve (from full bypass to closed bypass for a control signal varying between 0% and 30%) and the pump speed (from the minimum to the maximum value for a control signal varying between 30% and 100%),
a PI loop tracks the maximum inlet temperature, the minimum between this loop output and the previously mapped signal being used to modulate the valve.

Note that the first control signal for the valve is needed to stabilize the control of the system when the mass flow rate required to meet the heat or cold rejection demand is below the flow rate corresponding to the minimum pump speed.

Parameters

Type	Name	Default	Description
Real	TBorWatEntMax		Maximum value of borefield water entering temperature [K]
Real	spePumBorMin	0.1	Borefield pump minimum speed [1]

Connectors

Type	Name	Description
input RealInput	yValIso_actual[2]	Isolation valves return position (fractional)
input RealInput	u	Control signal from supervisory
output RealOutput	yPum	Control signal for borefield pump [kg/s]
output RealOutput	yValMix	Control signal for borefield mixing valve [1]
input RealInput	TBorWatEnt	Borefield water entering temperature [K]

Modelica definition

model Borefield "Borefield controller" parameter Real TBorWatEntMax( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Maximum value of borefield water entering temperature"; parameter Real spePumBorMin( final unit="1")=0.1 "Borefield pump minimum speed"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIso_actual[2] "Isolation valves return position (fractional)"; Buildings.Controls.OBC.CDL.Interfaces.RealInput u "Control signal from supervisory"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yPum( final unit="kg/s") "Control signal for borefield pump"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yValMix( final unit="1") "Control signal for borefield mixing valve"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TBorWatEnt( final unit="K", displayUnit="degC") "Borefield water entering temperature"; Buildings.Controls.OBC.CDL.Reals.PIDWithReset conMix( final yMin=0, final yMax=1, final reverseActing=true, y_reset=0, k=0.1, final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, Ti(displayUnit="s")=120) "Mixing valve controller"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant maxTBorWatEnt( y(final unit="K", displayUnit="degC"), final k=TBorWatEntMax) "Maximum value of borefield water entering temperature"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold opeVal( final t=0.9, final h=0.1) "True if at least one isolation valve is open"; Buildings.Controls.OBC.CDL.Reals.MultiMax multiMax1( final nin=2) "Maximum opening"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold enaSup( final t=0.05, final h=0.025) "Borefield enabled from supervisory"; Buildings.Controls.OBC.CDL.Reals.Switch runBor "Enable borefield system pump"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant limVal( final k=0.3) "Control signal value for full opening of the valve"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant speMin( final k=spePumBorMin) "Minimum pump speed"; Buildings.Controls.OBC.CDL.Logical.And enaBor "Borefield enable signal"; Buildings.Controls.OBC.CDL.Reals.Line mapSpe "Mapping function for pump speed"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant one( final k=1) "One"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant zer( final k=0) "Zero"; Buildings.Controls.OBC.CDL.Reals.Line mapVal "Mapping function for valve opening"; Buildings.Controls.OBC.CDL.Reals.Min min1 "Minimum"; equation connect(multiMax1.y,opeVal.u); connect(yValIso_actual,multiMax1.u); connect(u,enaSup.u); connect(enaSup.y,enaBor.u1); connect(opeVal.y,enaBor.u2); connect(enaBor.y,conMix.trigger); connect(maxTBorWatEnt.y,conMix.u_s); connect(runBor.y,yPum); connect(TBorWatEnt,conMix.u_m); connect(enaBor.y,runBor.u2); connect(mapSpe.y,runBor.u1); connect(u,mapSpe.u); connect(speMin.y,mapSpe.f1); connect(min1.y,yValMix); connect(conMix.y,min1.u2); connect(mapVal.y,min1.u1); connect(one.y,mapSpe.x2); connect(one.y,mapSpe.f2); connect(one.y,mapVal.f2); connect(zer.y,mapVal.x1); connect(limVal.y,mapVal.x2); connect(u,mapVal.u); connect(limVal.y,mapSpe.x1); connect(zer.y,mapVal.f1); connect(zer.y,runBor.u3); end Borefield;

Buildings.Obsolete.DHC.ETS.Combined.Controls.Chiller

Chiller controller

Buildings.Obsolete.DHC.ETS.Combined.Controls.Chiller

Information

This is a controller for the chiller system, which includes the dedicated condenser and evaporator pumps.

The system is enabled if any of the input control signals uHea or uCoo is true. When enabled,

the condenser and evaporator pumps are operated at constant speed, and
the condenser (resp. evaporator) mixing valve is modulated with a PI loop controlling the minimum (resp. maximum) inlet temperature.

Parameters

Type	Name	Default	Description
Real	TConWatEntMin		Minimum value of condenser water entering temperature [K]
Real	TEvaWatEntMax		Maximum value of evaporator water entering temperature [K]

Connectors

Type	Name	Description
input BooleanInput	uCoo	Cooling enable signal
input BooleanInput	uHea	Heating enable signal
input RealInput	TConWatEnt	Condenser water entering temperature [K]
input RealInput	TEvaWatEnt	Evaporator water entering temperature [K]
output RealOutput	yValCon	Condenser mixing valve control signal
output RealOutput	yValEva	Evaporator mixing valve control signal
output BooleanOutput	yChi	Chiller enable signal

Modelica definition

model Chiller "Chiller controller" parameter Real TConWatEntMin( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Minimum value of condenser water entering temperature"; parameter Real TEvaWatEntMax( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Maximum value of evaporator water entering temperature"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uCoo "Cooling enable signal"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uHea "Heating enable signal"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TConWatEnt( final unit="K", displayUnit="degC") "Condenser water entering temperature"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TEvaWatEnt( final unit="K", displayUnit="degC") "Evaporator water entering temperature"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yValCon "Condenser mixing valve control signal"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yValEva "Evaporator mixing valve control signal"; Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput yChi "Chiller enable signal"; Buildings.Controls.OBC.CDL.Logical.Or heaOrCoo "Heating or cooling enabled"; Buildings.Controls.OBC.Utilities.PIDWithEnable conValEva( final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final yMax=1, final yMin=0, y_reset=0, k=0.1, Ti( displayUnit="s")=60, final reverseActing=true) "Evaporator three-way valve control"; Buildings.Controls.OBC.Utilities.PIDWithEnable conValCon( final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final yMax=1, final yMin=0, y_reset=0, k=0.1, Ti( displayUnit="s")=60, final reverseActing=false) "Condenser three-way valve control"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant maxTEvaWatEnt( y(final unit="K", displayUnit="degC"), final k=TEvaWatEntMax) "Maximum value of evaporator water entering temperature"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant minTConWatEnt( y(final unit="K", displayUnit="degC"), final k=TConWatEntMin) "Minimum value of condenser water entering temperature"; equation connect(TEvaWatEnt,conValEva.u_m); connect(TConWatEnt,conValCon.u_m); connect(heaOrCoo.y,yChi); connect(uHea,heaOrCoo.u1); connect(uCoo,heaOrCoo.u2); connect(maxTEvaWatEnt.y,conValEva.u_s); connect(minTConWatEnt.y,conValCon.u_s); connect(conValEva.y,yValEva); connect(heaOrCoo.y,conValEva.uEna); connect(heaOrCoo.y,conValCon.uEna); connect(conValCon.y,yValCon); end Chiller;

Buildings.Obsolete.DHC.ETS.Combined.Controls.HeatExchanger

District heat exchanger controller

Buildings.Obsolete.DHC.ETS.Combined.Controls.HeatExchanger

Information

This block implements the control logic for the district heat exchanger, which realizes the interface between the building system and the district system.

The input signal u is yielded by the supervisory controller. The primary and secondary circuits are enabled to operate if this input signal is greater than zero and the return position of at least one isolation valve is greater than 90%. When enabled,

the secondary circuit is controlled based on the input signal u, which is mapped to modulate in sequence the mixing valve (from full bypass to closed bypass for a control signal varying between 0% and 30%) and the pump speed (from the minimum to the maximum value for a control signal varying between 30% and 100%), and
the primary pump speed (or valve opening) is directly modulated with the input signal u.

Note that the valve on the secondary side is needed to stabilize the control of the system when the secondary mass flow rate required to meet the heat or cold rejection demand is below the flow rate corresponding to the minimum pump speed.

Parameters

Type	Name	Default	Description
ConnectionConfiguration	conCon		District connection configuration
Real	spePum1Min	0.1	Heat exchanger primary pump minimum speed (fractional) [1]
Real	spePum2Min	0.1	Heat exchanger secondary pump minimum speed (fractional) [1]

Connectors

Type	Name	Description
input RealInput	yValIso[2]	Isolation valves return position (index 1 for condenser)
output RealOutput	y1	District heat exchanger primary control signal [1]
output RealOutput	yPum2	District heat exchanger secondary pump control signal [1]
output RealOutput	yVal2	District heat exchanger secondary valve control signal [1]
input RealInput	u	Control signal for secondary side (from supervisory)

Modelica definition

model HeatExchanger "District heat exchanger controller" parameter Buildings.DHC.ETS.Types.ConnectionConfiguration conCon "District connection configuration"; parameter Real spePum1Min( final unit="1", min=0)=0.1 "Heat exchanger primary pump minimum speed (fractional)"; parameter Real spePum2Min( final unit="1", min=0.01)=0.1 "Heat exchanger secondary pump minimum speed (fractional)"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIso[2] "Isolation valves return position (index 1 for condenser)"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput y1( final unit="1") "District heat exchanger primary control signal"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yPum2( final unit="1") "District heat exchanger secondary pump control signal"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yVal2( final unit="1") "District heat exchanger secondary valve control signal"; Buildings.Controls.OBC.CDL.Reals.Max max1 "Maximum between control signal and minimum speed or opening"; Buildings.Controls.OBC.CDL.Reals.Switch swiOff1 "Output zero if not enabled"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant min1( final k=if have_val1 then 0 else spePum1Min) "Minimum pump speed or actuator opening"; Buildings.Controls.OBC.CDL.Interfaces.RealInput u "Control signal for secondary side (from supervisory)"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greThr( final t=0.01, final h=0.005) "Check for heat or cold rejection demand"; Buildings.Controls.OBC.CDL.Logical.And and2 "At least one valve is open and HX circuit is enabled"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold heaRej( final t=0.9, final h=0.1) "Heat rejection if condenser isolation valve is open"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold cooRej( final t=0.9, final h=0.1) "Cold rejection if evaporator isolation valve is open"; Buildings.Controls.OBC.CDL.Logical.Or or1 "At least one valve is open "; Buildings.Controls.OBC.CDL.Reals.Sources.Constant speMin( final k=spePum2Min) "Minimum pump speed"; Buildings.Controls.OBC.CDL.Reals.Switch swiOff2 "Output zero if not enabled"; Buildings.Controls.OBC.CDL.Reals.Line mapSpe "Mapping function for pump speed"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant one( final k=1) "One"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant zer( final k=0) "Zero"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant hal( final k=0.3) "Control signal value for full opening of the valve"; Buildings.Controls.OBC.CDL.Reals.Line mapVal "Mapping function for valve opening"; protected parameter Boolean have_val1=conCon == Buildings.DHC.ETS.Types.ConnectionConfiguration.TwoWayValve "True in case of control valve on district side, false in case of a pump"; equation connect(swiOff1.y, y1); connect(max1.y,swiOff1.u1); connect(u,greThr.u); connect(greThr.y,and2.u1); connect(and2.y,swiOff1.u2); connect(cooRej.y,or1.u2); connect(heaRej.y,or1.u1); connect(or1.y,and2.u2); connect(min1.y,max1.u2); connect(swiOff2.y,yPum2); connect(one.y,mapSpe.x2); connect(one.y,mapSpe.f2); connect(u,mapSpe.u); connect(speMin.y,mapSpe.f1); connect(mapSpe.y,swiOff2.u1); connect(zer.y,swiOff2.u3); connect(zer.y,swiOff1.u3); connect(hal.y,mapSpe.x1); connect(u,mapVal.u); connect(zer.y,mapVal.x1); connect(zer.y,mapVal.f1); connect(one.y,mapVal.f2); connect(hal.y,mapVal.x2); connect(mapVal.y,yVal2); connect(and2.y,swiOff2.u2); connect(u, max1.u1); connect(yValIso[1], heaRej.u); connect(yValIso[2], cooRej.u); end HeatExchanger;

Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold

Control block for cold side

Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold

Information

This block serves as the controller for the cold side of the ETS in Buildings.Obsolete.DHC.ETS.Combined.Controls.Supervisory. It computes the following control signals.

Control signals for ambient sources yAmb (array)
The cold rejection control signal yielded by the hot side controller is processed as follows.
- A controller is used to track the chilled water supply temperature (CHWST) set point. This controller is enabled when cooling is enabled. It yields a control signal value between 0 and nSouAmb.
- The systems serving as ambient sources are then controlled in sequence by mapping the minimum between the CHWST control loop output and the part of the cold rejection signal between 0 and nSouAmb to a nSouAmb-array of signals between 0 and 1.
Chilled water supply temperature set point TChiWatSupSet
The remaining part of the cold rejection signal between nSouAmb and nSouAmb+1 is used to reset the CHWST set point between a maximum value provided as an input variable, and a minimum value provided as a parameter.
Control signal for the evaporator loop isolation valve yIsoAmb
The valve is commanded to be fully open whenever the cold rejection control signal is greater than zero. The command signal is held for 5 min to avoid short cycling.

Parameters

Type	Name	Default	Description
Integer	nSouAmb	1	Number of ambient sources to control
Real	TChiWatSupSetMin		Minimum value of chilled water supply temperature set point [K]
SimpleController	controllerType	Buildings.Controls.OBC.CDL.T...	Type of controller
Real	k	0.1	Gain of controller
Real	Ti	120	Time constant of integrator block [s]

Connectors

Type	Name	Description
input BooleanInput	uHeaCoo	Enable signal for heating or cooling
input RealInput	TSet	Supply temperature set point (heating or chilled water) [K]
input RealInput	uCol	Cold rejection control signal
input RealInput	TBot	Temperature at bottom of tank [K]
output RealOutput	TChiWatSupSet	Chilled water supply temperature set point [K]
output RealOutput	yAmb[nSouAmb]	Control signal for ambient sources [1]
output RealOutput	yValIso	Ambient loop isolation valve control signal [1]

Modelica definition

model SideCold "Control block for cold side" parameter Integer nSouAmb=1 "Number of ambient sources to control"; parameter Real TChiWatSupSetMin( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Minimum value of chilled water supply temperature set point"; parameter Buildings.Controls.OBC.CDL.Types.SimpleController controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI "Type of controller"; parameter Real k( min=0)=0.1 "Gain of controller"; parameter Real Ti( min=Buildings.Controls.OBC.CDL.Constants.small, final quantity="Time", final unit="s")=120 "Time constant of integrator block"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uHeaCoo "Enable signal for heating or cooling"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TSet( final unit="K", displayUnit="degC") "Supply temperature set point (heating or chilled water)"; Buildings.Controls.OBC.CDL.Interfaces.RealInput uCol "Cold rejection control signal"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TBot( final unit="K", displayUnit="degC") "Temperature at bottom of tank"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput TChiWatSupSet( final unit="K", displayUnit="degC") "Chilled water supply temperature set point"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yAmb[nSouAmb]( each final unit="1") "Control signal for ambient sources"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yValIso( final unit="1") "Ambient loop isolation valve control signal"; Buildings.Controls.OBC.CDL.Reals.Line mapFun[nSouAmb] "Mapping functions for ambient source control"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant x1[nSouAmb]( final k={(i-1) for i in 1:nSouAmb}) "x1"; Buildings.Controls.OBC.CDL.Routing.RealScalarReplicator rep( final nout=nSouAmb) "Replicate control signal"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant f1[nSouAmb]( each final k=0) "f1"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant f2[nSouAmb]( each final k=1) "f2"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant x2[nSouAmb]( final k={(i) for i in 1:nSouAmb}) "x2"; Buildings.Controls.OBC.Utilities.PIDWithEnable conTChiWatSup( final k=k, final Ti=Ti, final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final yMin=0, final yMax=1, final reverseActing=false) "Controller for CHWST"; Buildings.Controls.OBC.CDL.Reals.Line mapFunTChiSupSet "Mapping function for CHWST reset"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant minTChiWatSup( y(final unit="K", displayUnit="degC"), final k=TChiWatSupSetMin) "Minimum value of chilled water supply temperature"; Buildings.Controls.OBC.CDL.Reals.AddParameter addPar( p=nSouAmb) "One minus control loop output"; Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter gai( k=-nSouAmb) "Gain factor"; Buildings.Controls.OBC.CDL.Reals.Max max1 "CHWST reset signal"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant zer( k=0) "Zero"; Buildings.Controls.OBC.CDL.Reals.AddParameter subNumSou( p=-nSouAmb) "Control signal minus nSouAmb"; Buildings.Controls.OBC.CDL.Reals.Min min1 "Ambient source control signal"; Buildings.Controls.OBC.CDL.Reals.LimitSlewRate ramLimHea( raisingSlewRate=0.1) "Limit the rate of change"; Buildings.Controls.OBC.CDL.Conversions.BooleanToReal booToRea "Convert DO to AO signal"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greThr( t = 0.01, h = 0.005) "Control signal is non zero (with 1% tolerance)"; Buildings.Controls.OBC.CDL.Logical.TrueFalseHold truFalHol( trueHoldDuration=300) "Hold logical signal to avoid short cycling"; Buildings.Controls.OBC.CDL.Logical.Pre pre "Block to avoid an algebraic loop during initialization"; equation connect(x1.y,mapFun.x1); connect(rep.y,mapFun.u); connect(f1.y,mapFun.f1); connect(f2.y,mapFun.f2); connect(x2.y,mapFun.x2); connect(TSet,conTChiWatSup.u_s); connect(TBot,conTChiWatSup.u_m); connect(f2[1].y,mapFunTChiSupSet.x2); connect(minTChiWatSup.y,mapFunTChiSupSet.f2); connect(TSet,mapFunTChiSupSet.f1); connect(uCol,subNumSou.u); connect(max1.y,mapFunTChiSupSet.u); connect(uCol,min1.u1); connect(addPar.y,min1.u2); connect(min1.y,rep.u); connect(mapFun.y,yAmb); connect(ramLimHea.y,TChiWatSupSet); connect(uHeaCoo,conTChiWatSup.uEna); connect(zer.y,mapFunTChiSupSet.x1); connect(uCol,greThr.u); connect(mapFunTChiSupSet.y,ramLimHea.u); connect(zer.y,max1.u2); connect(subNumSou.y,max1.u1); connect(conTChiWatSup.y, gai.u); connect(gai.y, addPar.u); connect(truFalHol.y, booToRea.u); connect(booToRea.y, yValIso); connect(greThr.y, pre.u); connect(pre.y, truFalHol.u); end SideCold;

Buildings.Obsolete.DHC.ETS.Combined.Controls.SideHot

Control block for hot side

Buildings.Obsolete.DHC.ETS.Combined.Controls.SideHot

Information

This block serves as the controller for the hot side of the ETS in Buildings.Obsolete.DHC.ETS.Combined.Controls.Supervisory. It computes the following control signals.

Control signals for ambient sources yAmb (array)
The controller for heat rejection is enabled when the return position of the evaporator loop isolation valve is close to zero. When enabled, it maintains the temperature at the top of the heating water tank at the heating water supply temperature set point plus a dead band dTDea. The controller yields a control signal value between 0 and nSouAmb. The systems serving as ambient sources are then controlled in sequence by mapping the controller output to a nSouAmb-array of signals between 0 and 1.
Control signal for cold rejection yCol
The controller for cold rejection is enabled if
- the return position of the condenser loop isolation valve is close to zero, and
- heating is enabled, and
- the temperature at the top of the heating water tank is below a safety limit equal to the heating water supply temperature set point plus the parameter dTLoc. This last condition limits the temperature overshoot after the warmup periods, without having to finely tune the heat and cold rejection controller parameters to guard against the disturbing effect of a varying district water temperature.
When enabled, the controller maintains the temperature at the top of the heating water tank at the heating water supply temperature set point. The controller yields a signal between 0 and nSouAmb+1 which is connected to Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold where it is used to control in sequence the systems serving as ambient sources and ultimately to reset down the chilled water supply temperature.
Control signal for the condenser loop isolation valve yIsoAmb
The valve is commanded to be fully open whenever the controller for heat rejection yields an output signal greater than zero. The command signal is held for 5 min to avoid short cycling.

Parameters

Type	Name	Default	Description
Integer	nSouAmb	1	Number of ambient sources to control
Real	dTDea	1	Temperature difference band between set point tracking and heat rejection (absolute value) [K]
Real	dTLoc	dTDea + 2	Temperature difference between set point tracking and cold rejection lockout (absolute value) [K]
SimpleController	controllerType	Buildings.Controls.OBC.CDL.T...	Type of controller
Real	k	0.1	Gain of controller
Real	Ti	120	Time constant of integrator block [s]

Connectors

Type	Name	Description
input BooleanInput	uHea	Enable signal for heating
input BooleanInput	uCoo	Enable signal for cooling
input RealInput	TSet	Supply temperature set point (heating or chilled water) [K]
input RealInput	TTop	Temperature at top of tank [K]
input RealInput	yValIsoCon_actual	Return position of condenser to ambient loop isolation valve [1]
input RealInput	yValIsoEva_actual	Return position of evaporator to ambient loop isolation valve [1]
output RealOutput	yAmb[nSouAmb]	Control signal for ambient sources [1]
output RealOutput	yValIso	Ambient loop isolation valve control signal [1]
output RealOutput	yCol	Control signal for cold side [1]

Modelica definition

block SideHot "Control block for hot side" parameter Integer nSouAmb=1 "Number of ambient sources to control"; parameter Real dTDea( final min=0, final quantity="TemperatureDifference", final unit="K") = 1 "Temperature difference band between set point tracking and heat rejection (absolute value)"; parameter Real dTLoc( final min=0, final quantity="TemperatureDifference", final unit="K") = dTDea + 2 "Temperature difference between set point tracking and cold rejection lockout (absolute value)"; parameter Buildings.Controls.OBC.CDL.Types.SimpleController controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI "Type of controller"; parameter Real k( min=0)=0.1 "Gain of controller"; parameter Real Ti( final min=Buildings.Controls.OBC.CDL.Constants.small, final quantity="Time", final unit="s")=120 "Time constant of integrator block"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uHea "Enable signal for heating"; Buildings.Controls.OBC.CDL.Interfaces.BooleanInput uCoo "Enable signal for cooling"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TSet( final unit="K", displayUnit="degC") "Supply temperature set point (heating or chilled water)"; Buildings.Controls.OBC.CDL.Interfaces.RealInput TTop( final unit="K", displayUnit="degC") "Temperature at top of tank"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIsoCon_actual( final unit="1") "Return position of condenser to ambient loop isolation valve"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIsoEva_actual( final unit="1") "Return position of evaporator to ambient loop isolation valve"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yAmb[nSouAmb]( each final unit="1") "Control signal for ambient sources"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yValIso( final unit="1") "Ambient loop isolation valve control signal"; Buildings.Controls.OBC.CDL.Interfaces.RealOutput yCol( final unit="1") "Control signal for cold side"; Buildings.Controls.OBC.Utilities.PIDWithEnable conColRej( final k=k, final Ti=Ti, final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final yMin=0, final yMax=nSouAmb+1, final reverseActing=true) "Controller for cold rejection"; Buildings.Controls.OBC.CDL.Reals.GreaterThreshold greThr( final t = 0.01, final h = 0.005) "Control signal is non zero (with 1% tolerance)"; Buildings.Controls.OBC.CDL.Conversions.BooleanToReal booToRea "Convert DO to AO signal"; Buildings.Controls.OBC.Utilities.PIDWithEnable conHeaRej( final k=k, final Ti=Ti, final controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI, final yMin=0, final yMax=nSouAmb, final reverseActing=false) "Controller for heat rejection"; Buildings.Controls.OBC.CDL.Reals.Line mapFun[nSouAmb] "Mapping functions for controlled systems"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant x1[nSouAmb]( final k={(i-1) for i in 1:nSouAmb}) "x1"; Buildings.Controls.OBC.CDL.Routing.RealScalarReplicator rep( final nout=nSouAmb) "Replicate control signal"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant f1[nSouAmb]( each final k=0) "f1"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant f2[nSouAmb]( each final k=1) "f2"; Buildings.Controls.OBC.CDL.Reals.Sources.Constant x2[nSouAmb]( final k={(i) for i in 1:nSouAmb}) "x2"; Buildings.Controls.OBC.CDL.Reals.LessThreshold isValIsoConClo( final t=0.01, h=0.005) "Check if isolation valve is closed"; Buildings.Controls.OBC.CDL.Reals.LessThreshold isValIsoEvaClo( final t=0.01, h=0.005) "At least one signal is non zero"; Buildings.Controls.OBC.CDL.Logical.MultiAnd mulAnd( nin=3); Buildings.Controls.OBC.CDL.Reals.AddParameter addDea( p=dTDea) "Add dead band"; Buildings.Controls.OBC.CDL.Reals.AddParameter addLoc( p=dTLoc) "Add temperature difference for lockout"; Buildings.Controls.OBC.CDL.Reals.Less isBelLoc( h=0.1) "Check if temperature is below cold rejection lockout"; Buildings.Controls.OBC.CDL.Logical.TrueFalseHold truFalHol( trueHoldDuration=300) "Hold logical signal to avoid short cycling"; Buildings.Controls.OBC.CDL.Logical.Pre pre "Block to avoid algebraic loop during initialization"; Buildings.Controls.OBC.CDL.Logical.And and2 "And block to enable downstream controller for heat rejection"; equation connect(mapFun.y,yAmb); connect(TSet,conColRej.u_s); connect(TTop,conColRej.u_m); connect(conHeaRej.y,greThr.u); connect(x1.y,mapFun.x1); connect(conHeaRej.y,rep.u); connect(rep.y,mapFun.u); connect(f1.y,mapFun.f1); connect(f2.y,mapFun.f2); connect(x2.y,mapFun.x2); connect(conColRej.y,yCol); connect(TTop,conHeaRej.u_m); connect(yValIsoCon_actual,isValIsoConClo.u); connect(yValIsoEva_actual,isValIsoEvaClo.u); connect(mulAnd.y,conColRej.uEna); connect(TSet,addDea.u); connect(addDea.y,conHeaRej.u_s); connect(TSet,addLoc.u); connect(TTop,isBelLoc.u1); connect(addLoc.y,isBelLoc.u2); connect(uHea, mulAnd.u[1]); connect(isValIsoConClo.y,mulAnd.u[2]); connect(isBelLoc.y,mulAnd.u[3]); connect(truFalHol.y, booToRea.u); connect(booToRea.y, yValIso); connect(greThr.y, pre.u); connect(pre.y, truFalHol.u); connect(isValIsoEvaClo.y, and2.u2); connect(and2.y, conHeaRej.uEna); connect(and2.u1, uCoo); end SideHot;

Buildings.Obsolete.DHC.ETS.Combined.Controls.Supervisory

Supervisory controller

Buildings.Obsolete.DHC.ETS.Combined.Controls.Supervisory

Information

This block implements the supervisory control functions of the ETS model Buildings.DHC.ETS.Combined.HeatRecoveryHeatPump.

Heating (resp. cooling) is enabled based on the input signal uHea (resp. uCoo) which is held for 15', meaning that, when enabled, the mode remains active for at least 15 minutes and, when disabled, the mode cannot be enabled again for at least 15 minutes. The heating and cooling enable signals should be computed externally based on a schedule (to lock out the system during off-hours), ideally in conjunction with the number of requests yielded by the terminal unit controllers, or any other signal representative of the load. Indeed, the heating water supply set point is allowed to be reset down only when heating is disabled, in which case the system performance is improved due to a lower chiller lift.
The controller resets the heating water supply temperature based on the logic described in Buildings.DHC.ETS.Combined.Controls.Reset. Note that this resetting logic is meant to operate the chiller at low lift. The chilled water supply temperature may be also reset down by Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold to maintain the heating water supply temperature set point. This second resetting logic is required for the heating function of the unit, but it has a negative impact on the lift.
Eventually the systems serving as ambient sources are controlled based on the maximum of the control signals yAmb yielded by Buildings.Obsolete.DHC.ETS.Combined.Controls.SideHot and Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold.

Extends from Buildings.Obsolete.DHC.ETS.Combined.Controls.BaseClasses.PartialSupervisory (Partial model for supervisory controller).

Parameters

Type	Name	Default	Description
Integer	nSouAmb		Number of ambient sources to control
SimpleController	controllerType	Buildings.Controls.OBC.CDL.T...	Type of controller
Real	kHot	0.05	Gain of controller on hot side
Real	kCol	0.1	Gain of controller on cold side
Real	TiHot	300	Time constant of integrator block on hot side [s]
Real	TiCol	120	Time constant of integrator block on cold side [s]
Real	THeaWatSupSetMin		Minimum value of heating water supply temperature set point [K]
Real	TChiWatSupSetMin		Minimum value of chilled water supply temperature set point [K]
Real	TChiWatSupSetMax		Maximum value of chilled water supply temperature set point [K]

Connectors

Type	Name	Description
input BooleanInput	uHea	Heating enable signal
input BooleanInput	uCoo	Cooling enable signal
input RealInput	TChiWatSupPreSet	Chilled water supply temperature set point [K]
input RealInput	TChiWatBot	Chilled water temperature at tank bottom [K]
input RealInput	THeaWatTop	Heating water temperature at tank top [K]
input RealInput	THeaWatSupPreSet	Heating water supply temperature set point [K]
output RealOutput	THeaWatSupSet	Heating water supply temperature set point after reset [K]
output RealOutput	TChiWatSupSet	Chilled water supply temperature set point after reset [K]
output RealOutput	yValIsoEva	Evaporator to ambient loop isolation valve control signal [1]
output RealOutput	yValIsoCon	Condenser to ambient loop isolation valve control signal [1]
output RealOutput	yAmb[nSouAmb]	Control output for ambient sources [1]
output BooleanOutput	yHea	Tank in heating demand
output BooleanOutput	yCoo	Tank in cooling demand
input RealInput	yValIsoCon_actual	Return position of condenser to ambient loop isolation valve [1]
input RealInput	yValIsoEva_actual	Return position of evaporator to ambient loop isolation valve [1]

Modelica definition

model Supervisory "Supervisory controller" extends Buildings.Obsolete.DHC.ETS.Combined.Controls.BaseClasses.PartialSupervisory; parameter Buildings.Controls.OBC.CDL.Types.SimpleController controllerType=Buildings.Controls.OBC.CDL.Types.SimpleController.PI "Type of controller"; parameter Real kHot( min=0)=0.05 "Gain of controller on hot side"; parameter Real kCol( min=0)=0.1 "Gain of controller on cold side"; parameter Real TiHot( final min=Buildings.Controls.OBC.CDL.Constants.small, final quantity="Time", final unit="s") = 300 "Time constant of integrator block on hot side"; parameter Real TiCol( final min=Buildings.Controls.OBC.CDL.Constants.small, final quantity="Time", final unit="s") = 120 "Time constant of integrator block on cold side"; parameter Real THeaWatSupSetMin( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Minimum value of heating water supply temperature set point"; parameter Real TChiWatSupSetMin( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Minimum value of chilled water supply temperature set point"; parameter Real TChiWatSupSetMax( final quantity="ThermodynamicTemperature", final unit="K", displayUnit="degC") "Maximum value of chilled water supply temperature set point"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIsoCon_actual( final unit="1") "Return position of condenser to ambient loop isolation valve"; Buildings.Controls.OBC.CDL.Interfaces.RealInput yValIsoEva_actual( final unit="1") "Return position of evaporator to ambient loop isolation valve"; Buildings.Obsolete.DHC.ETS.Combined.Controls.SideHot conHot( final k=kHot, final Ti=TiHot, final nSouAmb=nSouAmb, final controllerType=controllerType) "Hot side controller"; Buildings.Obsolete.DHC.ETS.Combined.Controls.SideCold conCol( final k=kCol, final Ti=TiCol, final nSouAmb=nSouAmb, final controllerType=controllerType, final TChiWatSupSetMin=TChiWatSupSetMin) "Cold side controller"; Buildings.Controls.OBC.CDL.Reals.Max max1[nSouAmb] "Maximum of output control signals"; Buildings.DHC.ETS.Combined.Controls.Reset resTHeaSup( final TWatSupSetMinMax=THeaWatSupSetMin) "Heating water supply temperature reset"; Buildings.DHC.ETS.Combined.Controls.Reset resTCooSup( final TWatSupSetMinMax=TChiWatSupSetMax) "Chilled water supply temperature reset"; equation connect(conHot.yAmb,max1.u1); connect(conCol.yAmb,max1.u2); connect(conHot.yCol,conCol.uCol); connect(resTHeaSup.TWatSupSet, conHot.TSet); connect(THeaWatTop,conHot.TTop); connect(max1.y,yAmb); connect(TChiWatBot,conCol.TBot); connect(THeaWatSupPreSet, resTHeaSup.TWatSupPreSet); connect(conHot.yValIso,yValIsoCon); connect(conCol.yValIso,yValIsoEva); connect(resTHeaSup.TWatSupSet, THeaWatSupSet); connect(conCol.TChiWatSupSet,TChiWatSupSet); connect(uHeaHol.y, conHot.uHea); connect(uCooHol.y,conCol.uHeaCoo); connect(uHeaHol.y, resTHeaSup.u); connect(uHeaHol.y,yHea); connect(uCooHol.y,yCoo); connect(yValIsoCon_actual,conHot.yValIsoCon_actual); connect(yValIsoEva_actual,conHot.yValIsoEva_actual); connect(conHot.uCoo, uCooHol.y); connect(TChiWatSupPreSet, resTCooSup.TWatSupPreSet); connect(uCooHol.y, resTCooSup.u); connect(resTCooSup.TWatSupSet, conCol.TSet); end Supervisory;