Line data Source code
1 : // EnergyPlus, Copyright (c) 1996-2025, The Board of Trustees of the University of Illinois,
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47 :
48 : #include <EnergyPlus/Autosizing/HeatingWaterflowSizing.hh>
49 : #include <EnergyPlus/Data/EnergyPlusData.hh>
50 : #include <EnergyPlus/DataEnvironment.hh>
51 : #include <EnergyPlus/DataHVACGlobals.hh>
52 : #include <EnergyPlus/FluidProperties.hh>
53 : #include <EnergyPlus/Psychrometrics.hh>
54 :
55 : namespace EnergyPlus {
56 :
57 55 : Real64 HeatingWaterflowSizer::size(EnergyPlusData &state, Real64 _originalValue, bool &errorsFound)
58 : {
59 55 : if (!this->checkInitialized(state, errorsFound)) {
60 1 : return 0.0;
61 : }
62 54 : this->preSize(state, _originalValue);
63 : // component used AutoCalculate method to size value
64 54 : if (this->dataFractionUsedForSizing > 0.0) {
65 5 : this->autoSizedValue = this->dataConstantUsedForSizing * this->dataFractionUsedForSizing;
66 : } else {
67 49 : if (this->curZoneEqNum > 0) {
68 29 : if (!this->wasAutoSized && !this->sizingDesRunThisZone) {
69 2 : this->autoSizedValue = _originalValue;
70 : } else {
71 27 : if ((this->termUnitSingDuct || this->termUnitPIU || this->termUnitIU) && (this->curTermUnitSizingNum > 0)) {
72 10 : this->autoSizedValue = this->termUnitSizing(this->curTermUnitSizingNum).MaxHWVolFlow;
73 17 : } else if (this->zoneEqFanCoil) {
74 9 : this->autoSizedValue = this->zoneEqSizing(this->curZoneEqNum).MaxHWVolFlow;
75 8 : } else if (this->zoneEqUnitHeater || this->zoneEqVentedSlab) {
76 : // for unit ventilator the cp value is calculated at 5.05(InitConvTemp) for the
77 : // child and 60.0C for the unit ventilator //|| ZoneEqUnitVent
78 2 : this->autoSizedValue = this->zoneEqSizing(this->curZoneEqNum).MaxHWVolFlow;
79 : } else {
80 6 : Real64 DesMassFlow = this->finalZoneSizing(this->curZoneEqNum).DesHeatMassFlow;
81 6 : if (this->zoneEqSizing(this->curZoneEqNum).SystemAirFlow) {
82 1 : DesMassFlow = this->zoneEqSizing(this->curZoneEqNum).AirVolFlow * state.dataEnvrn->StdRhoAir;
83 5 : } else if (this->zoneEqSizing(this->curZoneEqNum).HeatingAirFlow) {
84 4 : DesMassFlow = this->zoneEqSizing(this->curZoneEqNum).HeatingAirVolFlow * state.dataEnvrn->StdRhoAir;
85 : }
86 6 : Real64 CoilInTemp = this->setHeatCoilInletTempForZoneEqSizing(
87 6 : this->setOAFracForZoneEqSizing(state, DesMassFlow, this->zoneEqSizing(this->curZoneEqNum)),
88 6 : this->zoneEqSizing(this->curZoneEqNum),
89 6 : this->finalZoneSizing(this->curZoneEqNum));
90 6 : Real64 CoilOutTemp = this->finalZoneSizing(this->curZoneEqNum).HeatDesTemp;
91 6 : Real64 CoilOutHumRat = this->finalZoneSizing(this->curZoneEqNum).HeatDesHumRat;
92 6 : Real64 DesCoilLoad = Psychrometrics::PsyCpAirFnW(CoilOutHumRat) * DesMassFlow * (CoilOutTemp - CoilInTemp);
93 6 : if (DesCoilLoad >= HVAC::SmallLoad) {
94 12 : if (this->dataWaterLoopNum > 0 && this->dataWaterLoopNum <= (int)state.dataPlnt->PlantLoop.size() &&
95 6 : this->dataWaterCoilSizHeatDeltaT > 0.0) {
96 6 : Real64 Cp = state.dataPlnt->PlantLoop(this->dataWaterLoopNum)
97 6 : .glycol->getSpecificHeat(state, Constant::HWInitConvTemp, this->callingRoutine);
98 6 : Real64 rho = state.dataPlnt->PlantLoop(this->dataWaterLoopNum)
99 6 : .glycol->getDensity(state, Constant::HWInitConvTemp, this->callingRoutine);
100 6 : this->autoSizedValue = DesCoilLoad / (this->dataWaterCoilSizHeatDeltaT * Cp * rho);
101 : } else {
102 0 : std::string msg = "Developer Error: For autosizing of " + this->compType + ' ' + this->compName +
103 0 : ", certain inputs are required. Add PlantLoop, Plant loop number and/or Water Coil water delta T.";
104 0 : this->errorType = AutoSizingResultType::ErrorType1;
105 0 : this->addErrorMessage(msg);
106 0 : ShowSevereError(state, msg);
107 0 : }
108 : } else {
109 0 : this->autoSizedValue = 0.0;
110 : }
111 : }
112 : }
113 20 : } else if (this->curSysNum > 0) {
114 19 : if (!this->wasAutoSized && !this->sizingDesRunThisAirSys) {
115 1 : this->autoSizedValue = _originalValue;
116 : } else {
117 18 : if (this->dataCapacityUsedForSizing >= HVAC::SmallLoad) {
118 36 : if (this->dataWaterLoopNum > 0 && this->dataWaterLoopNum <= (int)state.dataPlnt->PlantLoop.size() &&
119 18 : this->dataWaterCoilSizHeatDeltaT > 0.0) {
120 18 : Real64 Cp = state.dataPlnt->PlantLoop(this->dataWaterLoopNum)
121 18 : .glycol->getSpecificHeat(state, Constant::HWInitConvTemp, this->callingRoutine);
122 18 : Real64 rho = state.dataPlnt->PlantLoop(this->dataWaterLoopNum)
123 18 : .glycol->getDensity(state, Constant::HWInitConvTemp, this->callingRoutine);
124 18 : this->autoSizedValue = this->dataCapacityUsedForSizing / (this->dataWaterCoilSizHeatDeltaT * Cp * rho);
125 : } else {
126 0 : this->autoSizedValue = 0.0;
127 : std::string msg =
128 0 : "Developer Error: For autosizing of " + this->compType + ' ' + this->compName +
129 0 : ", certain inputs are required. Add PlantLoop, Plant loop number, coil capacity and/or Water Coil water delta T.";
130 0 : this->errorType = AutoSizingResultType::ErrorType1;
131 0 : this->addErrorMessage(msg);
132 0 : ShowSevereError(state, msg);
133 0 : }
134 : } else {
135 0 : this->autoSizedValue = 0.0;
136 : // Warning about zero design coil load is issued elsewhere.
137 : }
138 : }
139 : }
140 : }
141 54 : if (this->overrideSizeString) {
142 54 : if (this->isEpJSON) this->sizingString = "maximum_water_flow_rate [m3/s]";
143 : }
144 54 : this->selectSizerOutput(state, errorsFound);
145 54 : if (this->isCoilReportObject) {
146 54 : state.dataRptCoilSelection->coilSelectionReportObj->setCoilWaterFlowPltSizNum(
147 54 : state, this->compName, this->compType, this->autoSizedValue, this->wasAutoSized, this->dataPltSizHeatNum, this->dataWaterLoopNum);
148 54 : state.dataRptCoilSelection->coilSelectionReportObj->setCoilEntWaterTemp(state, this->compName, this->compType, Constant::HWInitConvTemp);
149 54 : if (this->plantSizData.size() > 0 && this->dataPltSizHeatNum > 0) {
150 36 : state.dataRptCoilSelection->coilSelectionReportObj->setCoilWaterDeltaT(
151 36 : state, this->compName, this->compType, this->plantSizData(this->dataPltSizHeatNum).DeltaT);
152 36 : state.dataRptCoilSelection->coilSelectionReportObj->setCoilLvgWaterTemp(
153 36 : state, this->compName, this->compType, Constant::HWInitConvTemp - this->plantSizData(this->dataPltSizHeatNum).DeltaT);
154 : }
155 : }
156 54 : return this->autoSizedValue;
157 : }
158 :
159 : } // namespace EnergyPlus
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