Include impact of AirTerminal:SingleDuct:Mixer in ZoneHVAC coil sizing

src/EnergyPlus/DataSizing.hh

@@ -639,24 +639,29 @@ namespace DataSizing {
     struct ZoneEqSizingData // data saved from zone eq component sizing and passed to subcomponents
     {
         // Members
-        Real64 AirVolFlow;           // design air vol flow rate for zone equipment unit [m3/s]
-        Real64 MaxHWVolFlow;         // design Hot Water vol flow for zone equipment unit [m3/s]
-        Real64 MaxCWVolFlow;         // design Cold Water vol flow for zone equipment unit [m3/s]
-        Real64 OAVolFlow;            // design outside air flow for zone equipment unit [m3/s]
-        Real64 DesCoolingLoad;       // design cooling load used for zone equipment [W]
-        Real64 DesHeatingLoad;       // design heating load used for zone equipment [W]
-        Real64 CoolingAirVolFlow;    // design cooling air vol flow rate for equipment[m3/s]
-        Real64 HeatingAirVolFlow;    // design heating air vol flow rate for equipment[m3/s]
-        Real64 SystemAirVolFlow;     // design heating air vol flow rate for equipment[m3/s]
-        bool AirFlow;                // TRUE if AirloopHVAC system air flow rate is calcualted
-        bool CoolingAirFlow;         // TRUE if AirloopHVAC system cooling air flow rate is calcualted
-        bool HeatingAirFlow;         // TRUE if AirloopHVAC system heating air flow rate is calcualted
-        bool SystemAirFlow;          // TRUE if AirloopHVAC system heating air flow rate is calcualted
-        bool Capacity;               // TRUE if AirloopHVAC system capacity is calculated
-        bool CoolingCapacity;        // TRUE if AirloopHVAC system cooling capacity is calculated
-        bool HeatingCapacity;        // TRUE if AirloopHVAC system heating capacity is calculated
-        bool SystemCapacity;         // TRUE if AirloopHVAC system heating capacity is calculated
-        bool DesignSizeFromParent;   // TRUE if design size is set by parent object - normally false, set to true for special cases e.g. ERV
+        Real64 AirVolFlow;            // design air vol flow rate for zone equipment unit [m3/s]
+        Real64 MaxHWVolFlow;          // design Hot Water vol flow for zone equipment unit [m3/s]
+        Real64 MaxCWVolFlow;          // design Cold Water vol flow for zone equipment unit [m3/s]
+        Real64 OAVolFlow;             // design outside air flow for zone equipment unit [m3/s]
+        Real64 ATMixerVolFlow;        // design ventilation air flow rate from air terminal mixer (central DOAS) [m3/s] //TRANE AT Mixer sizing
+        Real64 ATMixerCoolPriDryBulb; // design ventilation drybulb temperature from air terminal mixer during cooling (central DOAS) [C]
+        Real64 ATMixerCoolPriHumRat;  // design ventilation humidity ratio from air terminal mixer during cooling (central DOAS) [kgH20/kgDryAir]
+        Real64 ATMixerHeatPriDryBulb; // design ventilation drybulb temperature from air terminal mixer during heating (central DOAS) [C]
+        Real64 ATMixerHeatPriHumRat;  // design ventilation humidity ratio from air terminal mixer during heating (central DOAS) [kgH20/kgDryAir]
+        Real64 DesCoolingLoad;        // design cooling load used for zone equipment [W]
+        Real64 DesHeatingLoad;        // design heating load used for zone equipment [W]
+        Real64 CoolingAirVolFlow;     // design cooling air vol flow rate for equipment[m3/s]
+        Real64 HeatingAirVolFlow;     // design heating air vol flow rate for equipment[m3/s]
+        Real64 SystemAirVolFlow;      // design heating air vol flow rate for equipment[m3/s]
+        bool AirFlow;                 // TRUE if AirloopHVAC system air flow rate is calcualted
+        bool CoolingAirFlow;          // TRUE if AirloopHVAC system cooling air flow rate is calcualted
+        bool HeatingAirFlow;          // TRUE if AirloopHVAC system heating air flow rate is calcualted
+        bool SystemAirFlow;           // TRUE if AirloopHVAC system heating air flow rate is calcualted
+        bool Capacity;                // TRUE if AirloopHVAC system capacity is calculated
+        bool CoolingCapacity;         // TRUE if AirloopHVAC system cooling capacity is calculated
+        bool HeatingCapacity;         // TRUE if AirloopHVAC system heating capacity is calculated
+        bool SystemCapacity;          // TRUE if AirloopHVAC system heating capacity is calculated
+        bool DesignSizeFromParent;    // TRUE if design size is set by parent object - normally false, set to true for special cases e.g. ERV
         Array1D_int SizingMethod;    // supply air flow rate sizing method (SupplyAirFlowRate, FlowPerFloorArea, FractionOfAutosizedCoolingAirflow and
                                      // FractionOfAutosizedHeatingAirflow)
         Array1D_int CapSizingMethod; // capacity sizing methods (HeatingDesignCapacity, CoolingDesignCapacity, CapacityPerFloorArea,
@@ -665,6 +670,11 @@ namespace DataSizing {
         // Default Constructor
         ZoneEqSizingData()
             : AirVolFlow(0.0), MaxHWVolFlow(0.0), MaxCWVolFlow(0.0), OAVolFlow(0.0),
+              ATMixerVolFlow(0.0),        // design ventilation air flow rate from air terminal mixer (central DOAS) [m3/s]
+              ATMixerCoolPriDryBulb(0.0), // design air terminal mixer cooling outlet temperture [C]
+              ATMixerCoolPriHumRat(0.0),  // design air terminal mixer cooling outlet humidity ratio [kgH20/kgDryAir]
+              ATMixerHeatPriDryBulb(0.0), // design air terminal mixer heating outlet temperture [C]
+              ATMixerHeatPriHumRat(0.0),  // design air terminal mixer cheating outlet humidity ratio [kgH20/kgDryAir]
               DesCoolingLoad(0.0),        // design cooling load used for zone equipment [W]
               DesHeatingLoad(0.0),        // design heating load used for zone equipment [W]
               CoolingAirVolFlow(0.0),     // design cooling air vol flow rate for equipment[m3/s]

src/EnergyPlus/FanCoilUnits.cc

@@ -276,7 +276,7 @@ namespace FanCoilUnits {
         ZoneEqFanCoil = true;
 
         // Initialize the fan coil unit
-        InitFanCoilUnits(FanCoilNum, ZoneNum);
+        InitFanCoilUnits(FanCoilNum, ZoneNum, ControlledZoneNum);
 
         // Select the correct unit type
         {
@@ -1050,8 +1050,9 @@ namespace FanCoilUnits {
         }
     }
 
-    void InitFanCoilUnits(int const FanCoilNum, // number of the current fan coil unit being simulated
-                          int const ZoneNum     // number of zone being served
+    void InitFanCoilUnits(int const FanCoilNum,       // number of the current fan coil unit being simulated
+                          int const ZoneNum,          // number of zone being served
+                          int const ControlledZoneNum // index into ZoneEquipConfig array may not be equal to ZoneNum
     )
     {
 
@@ -1196,7 +1197,7 @@ namespace FanCoilUnits {
 
         if (!SysSizingCalc && MySizeFlag(FanCoilNum) && !MyPlantScanFlag(FanCoilNum)) {
 
-            SizeFanCoilUnit(FanCoilNum);
+            SizeFanCoilUnit(FanCoilNum, ControlledZoneNum);
 
             MySizeFlag(FanCoilNum) = false;
         }
@@ -1312,7 +1313,9 @@ namespace FanCoilUnits {
         }
     }
 
-    void SizeFanCoilUnit(int const FanCoilNum)
+    void SizeFanCoilUnit(int const FanCoilNum,
+                         int const ControlledZoneNum // index into ZoneEquipConfig array may not be equal to ZoneNum
+    )
     {
 
         // SUBROUTINE INFORMATION:
@@ -1671,6 +1674,10 @@ namespace FanCoilUnits {
                         }
                     }
                 }
+                ZoneEqSizing(CurZoneEqNum).OAVolFlow = FanCoil(FanCoilNum).OutAirVolFlow;
+                if (FanCoil(FanCoilNum).ATMixerExists) {
+                    SingleDuct::setATMixerSizingProperties(FanCoil(FanCoilNum).ATMixerIndex, ControlledZoneNum, CurZoneEqNum);
+                }
             }
         }
 
@@ -2048,7 +2055,6 @@ namespace FanCoilUnits {
         if (CurZoneEqNum > 0) {
             ZoneEqSizing(CurZoneEqNum).MaxHWVolFlow = FanCoil(FanCoilNum).MaxHotWaterVolFlow;
             ZoneEqSizing(CurZoneEqNum).MaxCWVolFlow = FanCoil(FanCoilNum).MaxColdWaterVolFlow;
-            ZoneEqSizing(CurZoneEqNum).OAVolFlow = FanCoil(FanCoilNum).OutAirVolFlow;
             ZoneEqSizing(CurZoneEqNum).AirVolFlow = FanCoil(FanCoilNum).MaxAirVolFlow;
             ZoneEqSizing(CurZoneEqNum).DesCoolingLoad = FanCoil(FanCoilNum).DesCoolingLoad;
             ZoneEqSizing(CurZoneEqNum).DesHeatingLoad = FanCoil(FanCoilNum).DesHeatingLoad;

src/EnergyPlus/FanCoilUnits.hh

@@ -286,11 +286,12 @@ namespace FanCoilUnits {
 
     void GetFanCoilUnits();
 
-    void InitFanCoilUnits(int const FanCoilNum, // number of the current fan coil unit being simulated
-                          int const ZoneNum     // number of zone being served
-    );
+    void InitFanCoilUnits(int const FanCoilNum,         // number of the current fan coil unit being simulated
+                          int const ZoneNum,            // number of zone being served
+                          int const ControlledZoneNum); // index into ZoneEquipConfig array; may not be equal to ZoneNum
 
-    void SizeFanCoilUnit(int const FanCoilNum);
+    void SizeFanCoilUnit(int const FanCoilNum,
+                         int const ControlledZoneNum); // index into ZoneEquipConfig array; may not be equal to ZoneNum
 
     void SizeCoilWaterFlowRate(std::string const &WaterCoilType,
                                std::string const &WaterCoilName,