Correct new DX coil no load supply air flow rate

NREL · Dec 5, 2023 · 7842e9f · 7842e9f · nrel-bot-2 · Dec 5, 2023
1 parent 4ccd87a
commit 7842e9f
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/src/EnergyPlus/UnitarySystem.cc b/src/EnergyPlus/UnitarySystem.cc
@@ -2114,18 +2114,21 @@ namespace UnitarySystems {
                     this->m_NoLoadAirFlowRateRatio = min(NoLoadCoolingAirFlowRateRatio, NoLoadHeatingAirFlowRateRatio);
                 }
             } else {
-                if (this->m_CoolingCoilType_Num == DataHVACGlobals::Coil_CoolingAirToAirVariableSpeed ||
-                    this->m_HeatingCoilType_Num == DataHVACGlobals::Coil_HeatingAirToAirVariableSpeed) {
-                    if (this->m_CoolCoilExists && this->m_CoolingCoilType_Num == DataHVACGlobals::Coil_CoolingAirToAirVariableSpeed) {
+                if (this->m_CoolCoilExists || this->m_HeatCoilExists) {
+                    if (this->m_CoolingCoilType_Num == DataHVACGlobals::Coil_CoolingAirToAirVariableSpeed) {
                         Real64 MaxSpeedFlowRate =
                             state.dataVariableSpeedCoils->VarSpeedCoil(this->m_CoolingCoilIndex)
                                 .MSRatedAirVolFlowRate(state.dataVariableSpeedCoils->VarSpeedCoil(this->m_CoolingCoilIndex).NumOfSpeeds);
                         if (MaxSpeedFlowRate > 0.0) {
                             NoLoadCoolingAirFlowRateRatio =
                                 state.dataVariableSpeedCoils->VarSpeedCoil(this->m_CoolingCoilIndex).MSRatedAirVolFlowRate(1) / MaxSpeedFlowRate;
                         }
+                    } else if (this->m_CoolingCoilType_Num == DataHVACGlobals::CoilDX_Cooling) {
+                        NoLoadCoolingAirFlowRateRatio = state.dataCoilCooingDX->coilCoolingDXs[this->m_CoolingCoilIndex]
+                                                            .performance.normalMode.speeds[0]
+                                                            .original_input_specs.evaporator_air_flow_fraction;
                     }
-                    if (this->m_HeatCoilExists && this->m_HeatingCoilType_Num == DataHVACGlobals::Coil_HeatingAirToAirVariableSpeed) {
+                    if (this->m_HeatingCoilType_Num == DataHVACGlobals::Coil_HeatingAirToAirVariableSpeed) {
                         Real64 MaxSpeedFlowRate =
                             state.dataVariableSpeedCoils->VarSpeedCoil(this->m_HeatingCoilIndex)
                                 .MSRatedAirVolFlowRate(state.dataVariableSpeedCoils->VarSpeedCoil(this->m_HeatingCoilIndex).NumOfSpeeds);