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47 :
48 : #include <EnergyPlus/Data/EnergyPlusData.hh>
49 : #include <EnergyPlus/DataBranchAirLoopPlant.hh>
50 : #include <EnergyPlus/FluidProperties.hh>
51 : #include <EnergyPlus/General.hh>
52 : #include <EnergyPlus/Plant/DataPlant.hh>
53 : #include <EnergyPlus/Plant/Loop.hh>
54 : #include <EnergyPlus/UtilityRoutines.hh>
55 :
56 : namespace EnergyPlus::DataPlant {
57 :
58 17204433 : void PlantLoopData::UpdateLoopSideReportVars(EnergyPlusData &state,
59 : Real64 const OtherSideDemand, // This is the 'other side' demand, based on other side flow
60 : Real64 const LocalRemLoopDemand // Unmet Demand after equipment has been simulated (report variable)
61 : )
62 : {
63 :
64 : // SUBROUTINE INFORMATION:
65 : // AUTHOR Dan Fisher
66 : // DATE WRITTEN July 1998
67 : // MODIFIED Aug 2010 Edwin Lee -- add per LoopSide variable support
68 : // RE-ENGINEERED na
69 :
70 17204433 : this->InletNodeFlowrate = state.dataLoopNodes->Node(this->LoopSide(DataPlant::LoopSideLocation::Supply).NodeNumIn).MassFlowRate;
71 17204433 : this->InletNodeTemperature = state.dataLoopNodes->Node(this->LoopSide(DataPlant::LoopSideLocation::Supply).NodeNumIn).Temp;
72 17204433 : this->OutletNodeFlowrate = state.dataLoopNodes->Node(this->LoopSide(DataPlant::LoopSideLocation::Supply).NodeNumOut).MassFlowRate;
73 17204433 : this->OutletNodeTemperature = state.dataLoopNodes->Node(this->LoopSide(DataPlant::LoopSideLocation::Supply).NodeNumOut).Temp;
74 :
75 : // In the baseline code, only reported supply side demand. so putting in "SupplySide" IF block for now but might expand later
76 17204433 : if (OtherSideDemand < 0.0) {
77 4614102 : this->CoolingDemand = std::abs(OtherSideDemand);
78 4614102 : this->HeatingDemand = 0.0;
79 4614102 : this->DemandNotDispatched = -LocalRemLoopDemand; // Setting sign based on old logic for now
80 : } else {
81 12590331 : this->HeatingDemand = OtherSideDemand;
82 12590331 : this->CoolingDemand = 0.0;
83 12590331 : this->DemandNotDispatched = LocalRemLoopDemand; // Setting sign based on old logic for now
84 : }
85 :
86 17204433 : this->CalcUnmetPlantDemand(state);
87 17204433 : }
88 :
89 17204433 : void PlantLoopData::CalcUnmetPlantDemand(EnergyPlusData &state)
90 : {
91 :
92 : // SUBROUTINE INFORMATION:
93 : // AUTHOR Brent Griffith
94 : // DATE WRITTEN June 2011
95 : // MODIFIED na
96 : // RE-ENGINEERED na
97 :
98 : // PURPOSE OF THIS SUBROUTINE:
99 : // determine the magnitude of unmet plant loads after the half loop simulation is done
100 :
101 : // METHODOLOGY EMPLOYED:
102 : // using the loop setpoint node, look at target vs current and
103 : // calculate a demand based on mass flow times specific heat times delta T
104 :
105 : // Using/Aliasing
106 : using DataPlant::LoopDemandTol;
107 : using FluidProperties::GetSatEnthalpyRefrig;
108 : using FluidProperties::GetSpecificHeatGlycol;
109 :
110 : // SUBROUTINE PARAMETER DEFINITIONS:
111 : static constexpr std::string_view RoutineName("PlantLoopSolver::EvaluateLoopSetPointLoad");
112 : static constexpr std::string_view RoutineNameAlt("PlantSupplySide:EvaluateLoopSetPointLoad");
113 :
114 : //~ General variables
115 : Real64 MassFlowRate;
116 : Real64 TargetTemp;
117 : Real64 LoopSetPointTemperature;
118 : Real64 LoopSetPointTemperatureHi;
119 : Real64 LoopSetPointTemperatureLo;
120 : Real64 LoadToHeatingSetPoint;
121 : Real64 LoadToCoolingSetPoint;
122 : Real64 DeltaTemp;
123 : Real64 Cp;
124 : Real64 EnthalpySteamSatVapor; // Enthalpy of saturated vapor
125 : Real64 EnthalpySteamSatLiquid; // Enthalpy of saturated liquid
126 : Real64 LatentHeatSteam; // Latent heat of steam
127 : Real64 LoadToLoopSetPoint;
128 :
129 : // Initialize
130 17204433 : LoadToLoopSetPoint = 0.0;
131 :
132 : // Get temperature at loop setpoint node.
133 17204433 : TargetTemp = state.dataLoopNodes->Node(this->TempSetPointNodeNum).Temp;
134 17204433 : MassFlowRate = state.dataLoopNodes->Node(this->TempSetPointNodeNum).MassFlowRate;
135 :
136 17204433 : if (this->FluidType == DataLoopNode::NodeFluidType::Water) {
137 :
138 17152045 : Cp = GetSpecificHeatGlycol(state, this->FluidName, TargetTemp, this->FluidIndex, RoutineName);
139 :
140 17152045 : switch (this->LoopDemandCalcScheme) {
141 16972667 : case DataPlant::LoopDemandCalcScheme::SingleSetPoint: {
142 :
143 : // Pick up the loop setpoint temperature
144 16972667 : LoopSetPointTemperature = this->LoopSide(DataPlant::LoopSideLocation::Supply).TempSetPoint;
145 : // Calculate the delta temperature
146 16972667 : DeltaTemp = LoopSetPointTemperature - TargetTemp;
147 :
148 : // Calculate the demand on the loop
149 16972667 : LoadToLoopSetPoint = MassFlowRate * Cp * DeltaTemp;
150 16972667 : } break;
151 179378 : case DataPlant::LoopDemandCalcScheme::DualSetPointDeadBand: {
152 : // Get the range of setpoints
153 179378 : LoopSetPointTemperatureHi = state.dataLoopNodes->Node(this->TempSetPointNodeNum).TempSetPointHi;
154 179378 : LoopSetPointTemperatureLo = state.dataLoopNodes->Node(this->TempSetPointNodeNum).TempSetPointLo;
155 :
156 : // Calculate the demand on the loop
157 179378 : if (MassFlowRate > 0.0) {
158 170899 : LoadToHeatingSetPoint = MassFlowRate * Cp * (LoopSetPointTemperatureLo - TargetTemp);
159 170899 : LoadToCoolingSetPoint = MassFlowRate * Cp * (LoopSetPointTemperatureHi - TargetTemp);
160 : // Possible combinations:
161 : // 1 LoadToHeatingSetPoint > 0 & LoadToCoolingSetPoint > 0 --> Heating required
162 : // 2 LoadToHeatingSetPoint < 0 & LoadToCoolingSetPoint < 0 --> Cooling Required
163 : // 3 LoadToHeatingSetPoint <=0 & LoadToCoolingSetPoint >=0 --> Dead Band Operation - includes zero load cases
164 : // 4 LoadToHeatingSetPoint > LoadToCoolingSetPoint --> Not Feasible if LoopSetPointHi >= LoopSetPointLo
165 170899 : if (LoadToHeatingSetPoint > 0.0 && LoadToCoolingSetPoint > 0.0) {
166 28230 : LoadToLoopSetPoint = LoadToHeatingSetPoint;
167 142669 : } else if (LoadToHeatingSetPoint < 0.0 && LoadToCoolingSetPoint < 0.0) {
168 38406 : LoadToLoopSetPoint = LoadToCoolingSetPoint;
169 104263 : } else if (LoadToHeatingSetPoint <= 0.0 && LoadToCoolingSetPoint >= 0.0) { // deadband includes zero loads
170 104263 : LoadToLoopSetPoint = 0.0;
171 : }
172 : } else {
173 8479 : LoadToLoopSetPoint = 0.0;
174 : }
175 179378 : } break;
176 0 : default:
177 0 : break;
178 : }
179 :
180 52388 : } else if (this->FluidType == DataLoopNode::NodeFluidType::Steam) {
181 :
182 52388 : Cp = GetSpecificHeatGlycol(state, this->FluidName, TargetTemp, this->FluidIndex, RoutineName);
183 :
184 52388 : switch (this->LoopDemandCalcScheme) {
185 52388 : case DataPlant::LoopDemandCalcScheme::SingleSetPoint: {
186 :
187 : // Pick up the loop setpoint temperature
188 52388 : LoopSetPointTemperature = this->LoopSide(DataPlant::LoopSideLocation::Supply).TempSetPoint;
189 :
190 : // Calculate the delta temperature
191 52388 : DeltaTemp = LoopSetPointTemperature - TargetTemp;
192 :
193 52388 : EnthalpySteamSatVapor = GetSatEnthalpyRefrig(state, this->FluidName, LoopSetPointTemperature, 1.0, this->FluidIndex, RoutineNameAlt);
194 52388 : EnthalpySteamSatLiquid = GetSatEnthalpyRefrig(state, this->FluidName, LoopSetPointTemperature, 0.0, this->FluidIndex, RoutineNameAlt);
195 :
196 52388 : LatentHeatSteam = EnthalpySteamSatVapor - EnthalpySteamSatLiquid;
197 :
198 : // Calculate the demand on the loop
199 52388 : LoadToLoopSetPoint = MassFlowRate * (Cp * DeltaTemp + LatentHeatSteam);
200 52388 : } break;
201 0 : default:
202 0 : break;
203 : }
204 :
205 : } else { // only have two types, water serves for glycol.
206 : }
207 :
208 : // Trim the demand to zero if it is very small
209 17204433 : if (std::abs(LoadToLoopSetPoint) < LoopDemandTol) LoadToLoopSetPoint = 0.0;
210 :
211 17204433 : this->UnmetDemand = LoadToLoopSetPoint;
212 17204433 : }
213 :
214 17204433 : void PlantLoopData::CheckLoopExitNode(EnergyPlusData &state, bool const FirstHVACIteration)
215 : {
216 :
217 : // SUBROUTINE INFORMATION:
218 : // AUTHOR Dan Fisher
219 : // DATE WRITTEN October 1998
220 : // MODIFIED na
221 : // RE-ENGINEERED na
222 :
223 : // PURPOSE OF THIS SUBROUTINE:
224 : // This subroutine sets the temperature
225 : // and mass flow rate of the plant loop supply side exit
226 : // node. As written, the routine calculates the exit
227 : // temperature based on the fraction of loop demand met
228 : // by the plant equipment. This assumes that each piece
229 : // of operating plant equipment produced chilled/hot water
230 : // at the loop setpoint temperature.
231 :
232 : // Using/Aliasing
233 :
234 : // SUBROUTINE LOCAL VARIABLE DECLARATIONS:
235 : int LoopInlet; // plant loop inlet node num.
236 : int LoopOutlet; // plant loop outlet node num.
237 :
238 : // set local variables: loop inlet and outlet nodes
239 17204433 : auto &Supply = this->LoopSide(DataPlant::LoopSideLocation::Supply);
240 17204433 : LoopInlet = Supply.NodeNumIn;
241 17204433 : LoopOutlet = Supply.NodeNumOut;
242 : // Check continuity invalid...loop pumps now turned on and off
243 17204433 : if (!FirstHVACIteration && !state.dataGlobal->WarmupFlag) {
244 1617721 : if (std::abs(state.dataLoopNodes->Node(LoopOutlet).MassFlowRate - state.dataLoopNodes->Node(LoopInlet).MassFlowRate) >
245 : DataBranchAirLoopPlant::MassFlowTolerance) {
246 0 : if (this->MFErrIndex == 0) {
247 0 : ShowWarningError(state,
248 0 : "PlantSupplySide: PlantLoop=\"" + this->Name +
249 : "\", Error (CheckLoopExitNode) -- Mass Flow Rate Calculation. Outlet and Inlet differ by more than tolerance.");
250 0 : ShowContinueErrorTimeStamp(state, "");
251 0 : ShowContinueError(state,
252 0 : format("Loop inlet node={}, flowrate={:.4R} kg/s",
253 0 : state.dataLoopNodes->NodeID(LoopInlet),
254 0 : state.dataLoopNodes->Node(LoopInlet).MassFlowRate));
255 0 : ShowContinueError(state,
256 0 : format("Loop outlet node={}, flowrate={:.4R} kg/s",
257 0 : state.dataLoopNodes->NodeID(LoopOutlet),
258 0 : state.dataLoopNodes->Node(LoopOutlet).MassFlowRate));
259 0 : ShowContinueError(state, "This loop might be helped by a bypass.");
260 : }
261 0 : ShowRecurringWarningErrorAtEnd(
262 0 : state, "PlantSupplySide: PlantLoop=\"" + this->Name + "\", Error -- Mass Flow Rate Calculation -- continues ** ", this->MFErrIndex);
263 : }
264 : }
265 : // Reset Max loop flow rate based on pump performance
266 17204433 : state.dataLoopNodes->Node(LoopOutlet).MassFlowRateMax = state.dataLoopNodes->Node(LoopInlet).MassFlowRateMax;
267 17204433 : }
268 :
269 2313 : } // namespace EnergyPlus::DataPlant
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