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1 : // EnergyPlus, Copyright (c) 1996-2025, The Board of Trustees of the University of Illinois,
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47 :
48 : #include <EnergyPlus/Autosizing/WaterHeatingCapacitySizing.hh>
49 : #include <EnergyPlus/Data/EnergyPlusData.hh>
50 : #include <EnergyPlus/DataEnvironment.hh>
51 : #include <EnergyPlus/FluidProperties.hh>
52 : #include <EnergyPlus/General.hh>
53 : #include <EnergyPlus/Psychrometrics.hh>
54 :
55 : namespace EnergyPlus {
56 :
57 2033 : Real64 WaterHeatingCapacitySizer::size(EnergyPlusData &state, Real64 _originalValue, bool &errorsFound)
58 : {
59 2033 : if (!this->checkInitialized(state, errorsFound)) {
60 0 : return 0.0;
61 : }
62 2033 : this->preSize(state, _originalValue);
63 :
64 2033 : if (this->curZoneEqNum > 0) {
65 2033 : if (!this->wasAutoSized && !this->sizingDesRunThisZone) {
66 0 : this->autoSizedValue = _originalValue;
67 : } else {
68 2033 : Real64 DesMassFlow = 0.0;
69 2033 : Real64 NominalCapacityDes = 0.0;
70 2033 : Real64 CoilInTemp = 0.0;
71 2033 : Real64 CoilOutTemp = 0.0;
72 2033 : Real64 CoilOutHumRat = 0.0;
73 2033 : if ((this->termUnitSingDuct || this->termUnitPIU || this->termUnitIU) && (this->curTermUnitSizingNum > 0)) {
74 1929 : DesMassFlow = this->termUnitSizing(this->curTermUnitSizingNum).MaxHWVolFlow;
75 : Real64 Cp =
76 1929 : state.dataPlnt->PlantLoop(this->dataWaterLoopNum).glycol->getSpecificHeat(state, Constant::HWInitConvTemp, this->callingRoutine);
77 : Real64 rho =
78 1929 : state.dataPlnt->PlantLoop(this->dataWaterLoopNum).glycol->getDensity(state, Constant::HWInitConvTemp, this->callingRoutine);
79 1929 : NominalCapacityDes = DesMassFlow * this->dataWaterCoilSizHeatDeltaT * Cp * rho;
80 2033 : } else if (this->zoneEqFanCoil || this->zoneEqUnitHeater) {
81 83 : DesMassFlow = this->zoneEqSizing(this->curZoneEqNum).MaxHWVolFlow;
82 : Real64 Cp =
83 83 : state.dataPlnt->PlantLoop(this->dataWaterLoopNum).glycol->getSpecificHeat(state, Constant::HWInitConvTemp, this->callingRoutine);
84 : Real64 rho =
85 83 : state.dataPlnt->PlantLoop(this->dataWaterLoopNum).glycol->getDensity(state, Constant::HWInitConvTemp, this->callingRoutine);
86 83 : NominalCapacityDes = DesMassFlow * this->dataWaterCoilSizHeatDeltaT * Cp * rho;
87 : // if coil is part of a zonal unit, calc coil load to get hot water flow rate
88 83 : } else {
89 21 : if (this->zoneEqSizing(this->curZoneEqNum).SystemAirFlow) {
90 0 : DesMassFlow = this->zoneEqSizing(this->curZoneEqNum).AirVolFlow * state.dataEnvrn->StdRhoAir;
91 21 : } else if (this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {
92 12 : DesMassFlow = this->zoneEqSizing(this->curZoneEqNum).HeatingAirVolFlow * state.dataEnvrn->StdRhoAir;
93 : } else {
94 9 : DesMassFlow = this->finalZoneSizing(this->curZoneEqNum).DesHeatMassFlow;
95 : }
96 21 : CoilInTemp = this->setHeatCoilInletTempForZoneEqSizing(
97 21 : this->setOAFracForZoneEqSizing(state, DesMassFlow, this->zoneEqSizing(this->curZoneEqNum)),
98 21 : this->zoneEqSizing(this->curZoneEqNum),
99 21 : this->finalZoneSizing(this->curZoneEqNum));
100 : // Real64 CoilInHumRat =
101 : // this->setHeatCoilInletHumRatForZoneEqSizing(this->setOAFracForZoneEqSizing(DesMassFlow, this->zoneEqSizing(this->curZoneEqNum)),
102 : // this->zoneEqSizing(this->curZoneEqNum),
103 : // this->finalZoneSizing(this->curZoneEqNum));
104 21 : CoilOutTemp = this->finalZoneSizing(this->curZoneEqNum).HeatDesTemp;
105 21 : CoilOutHumRat = this->finalZoneSizing(this->curZoneEqNum).HeatDesHumRat;
106 21 : NominalCapacityDes = Psychrometrics::PsyCpAirFnW(CoilOutHumRat) * DesMassFlow * (CoilOutTemp - CoilInTemp);
107 : }
108 2033 : this->autoSizedValue = NominalCapacityDes * this->dataHeatSizeRatio;
109 2033 : if (state.dataGlobal->DisplayExtraWarnings && this->autoSizedValue <= 0.0) {
110 0 : std::string msg = this->callingRoutine + ": Potential issue with equipment sizing for " + this->compType + ' ' + this->compName;
111 0 : this->addErrorMessage(msg);
112 0 : ShowWarningMessage(state, msg);
113 0 : msg = format("...Rated Total Heating Capacity = {:.2T} [W]", this->autoSizedValue);
114 0 : this->addErrorMessage(msg);
115 0 : ShowContinueError(state, msg);
116 0 : msg = format("...Air flow rate used for sizing = {:.5T} [m3/s]", DesMassFlow / state.dataEnvrn->StdRhoAir);
117 0 : this->addErrorMessage(msg);
118 0 : ShowContinueError(state, msg);
119 0 : if (this->termUnitSingDuct || this->termUnitPIU || this->termUnitIU || this->zoneEqFanCoil || this->zoneEqUnitHeater) {
120 0 : msg = format("...Air flow rate used for sizing = {:.5T} [m3/s]", DesMassFlow / state.dataEnvrn->StdRhoAir);
121 0 : this->addErrorMessage(msg);
122 0 : ShowContinueError(state, msg);
123 0 : msg = format("...Plant loop temperature difference = {:.2T} [C]", this->dataWaterCoilSizHeatDeltaT);
124 0 : this->addErrorMessage(msg);
125 0 : ShowContinueError(state, msg);
126 : } else {
127 0 : msg = format("...Coil inlet air temperature used for sizing = {:.2T} [C]", CoilInTemp);
128 0 : this->addErrorMessage(msg);
129 0 : ShowContinueError(state, msg);
130 0 : msg = format("...Coil outlet air temperature used for sizing = {:.2T} [C]", CoilOutTemp);
131 0 : this->addErrorMessage(msg);
132 0 : ShowContinueError(state, msg);
133 0 : msg = format("...Coil outlet air humidity ratio used for sizing = {:.2T} [kgWater/kgDryAir]", CoilOutHumRat);
134 0 : this->addErrorMessage(msg);
135 0 : ShowContinueError(state, msg);
136 : }
137 0 : }
138 : }
139 0 : } else if (this->curSysNum > 0) {
140 0 : if (!this->wasAutoSized && !this->sizingDesRunThisAirSys) {
141 0 : this->autoSizedValue = _originalValue;
142 : } else {
143 : // not implemented for air loop equipment
144 : }
145 : }
146 2033 : if (this->overrideSizeString) {
147 2033 : if (this->isEpJSON) {
148 0 : this->sizingString = "rated_capacity";
149 : }
150 : }
151 2033 : this->selectSizerOutput(state, errorsFound);
152 2033 : if (this->isCoilReportObject) {
153 2033 : state.dataRptCoilSelection->coilSelectionReportObj->setCoilWaterHeaterCapacityPltSizNum(
154 2033 : state, this->compName, this->compType, this->autoSizedValue, this->wasAutoSized, this->dataPltSizHeatNum, this->dataWaterLoopNum);
155 : }
156 2033 : return this->autoSizedValue;
157 : }
158 :
159 : } // namespace EnergyPlus
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