Implement new coil vs. space peak sizing simulation logic

idd/Energy+.idd.in

@@ -1736,17 +1736,17 @@ Site:GroundDomain:Slab,
         \default 5
         \units m
         \minimum> 0.0
-   N4, \field Soil Thermal Conductivity
+   N4,  \field Soil Thermal Conductivity
         \type real
         \default 1.5
         \units W/m-K
         \minimum> 0.0
-   N5, \field Soil Density
+   N5,  \field Soil Density
         \type real
         \default 2800
         \units kg/m3
         \minimum> 0.0
-   N6, \field Soil Specific Heat
+   N6,  \field Soil Specific Heat
         \type real
         \default 850
         \units J/kg-K
@@ -30763,8 +30763,9 @@ DesignSpecification:ZoneHVAC:Sizing,
 
 Sizing:System,
       \memo Specifies the input needed to perform sizing calculations for a central forced air
-      \memo system design air flow, heating capacity, and cooling capacity.
-      \min-fields 27
+      \memo system. System design air flow, heating capacity, and cooling capacity will be calculated
+      \memo using this input data.
+      \min-fields 37
   A1, \field AirLoop Name
       \required-field
       \type object-list
@@ -30774,24 +30775,23 @@ Sizing:System,
       \note Sensible and VentilationRequirement are the only available options
       \note Sensible uses the zone design air flow rates
       \note VentilationRequirement uses the system ventilation requirement
-      \required-field
       \type choice
       \key Sensible
+      \key Total
       \key VentilationRequirement
-      !\key Latent
-      !\key Total
       \default Sensible
   N1, \field Design Outdoor Air Flow Rate
       \type real
       \default autosize
       \minimum 0.0
       \units m3/s
       \autosizable
-  N2, \field Minimum System Air Flow Ratio
+  N2, \field Central Heating Maximum System Air Flow Ratio
       \required-field
       \type real
       \minimum 0.0
       \maximum 1.0
+      \default 0.5
   N3, \field Preheat Design Temperature
       \required-field
       \type real
@@ -30816,7 +30816,7 @@ Sizing:System,
       \required-field
       \type real
       \units C
-  A3, \field Sizing Option
+  A3, \field Type of Zone Sum to Use
       \type choice
       \key Coincident
       \key NonCoincident
@@ -30950,8 +30950,7 @@ Sizing:System,
       \minimum 0.0
       \autosizable
       \default autosize
-      \note Enter the design cooling capacity. Required field when the cooling design capacity method
-      \note CoolingDesignCapacity.
+      \note Enter the design cooling capacity.
  N22, \field Cooling Design Capacity Per Floor Area
       \type real
       \units W/m2
@@ -30985,19 +30984,26 @@ Sizing:System,
       \minimum 0.0
       \autosizable
       \default autosize
-      \note Enter the design heating capacity. Required field when the heating design capacity method
-      \note HeatingDesignCapacity.
+      \note Enter the design heating capacity.
  N25, \field Heating Design Capacity Per Floor Area
       \type real
       \units W/m2
       \minimum 0.0
       \note Enter the heating design capacity per zone floor area. Required field when the heating design
       \note capacity method field is CapacityPerFloorArea.
- N26; \field Fraction of Autosized Heating Design Capacity
+ N26, \field Fraction of Autosized Heating Design Capacity
       \type real
       \minimum 0.0
       \note Enter the fraction of auto-sized heating design capacity. Required field when capacity the
       \note heating design capacity method field is FractionOfAutosizedHeatingCapacity.
+ A11; \field Central Cooling Capacity Control Method
+      \note Method used to control the coil's output
+      \type choice
+      \key VAV
+      \key Bypass
+      \key VT
+      \key OnOff
+      \default VAV
 
 Sizing:Plant,
       \memo Specifies the input needed to autosize plant loop flow rates and equipment capacities.
@@ -63793,8 +63799,8 @@ PlantEquipmentList,
     \memo should be OFF (not operate) within the specified lower/upper limit.
     \min-fields 1
   A1 , \field Name
-       \required-field
-       \reference PlantAndCondenserEquipmentLists
+        \required-field
+        \reference PlantAndCondenserEquipmentLists
   A2 , \field Equipment 1 Object Type
   A3 , \field Equipment 1 Name
   A4 , \field Equipment 2 Object Type

src/EnergyPlus/DXCoils.cc

@@ -5545,28 +5545,28 @@ namespace DXCoils {
 							VolFlowRate = DXCoil( DXCoilNum ).MSRatedAirVolFlowRate( Mode );
 							if ( VolFlowRate >= SmallAirVolFlow ) {
 								if ( CurOASysNum > 0 ) { // coil is in the OA stream
-									MixTemp = FinalSysSizing( CurSysNum ).CoolOutTemp;
-									MixHumRat = FinalSysSizing( CurSysNum ).CoolOutHumRat;
+									MixTemp = FinalSysSizing( CurSysNum ).OutTempAtCoolPeak;
+									MixHumRat = FinalSysSizing( CurSysNum ).OutHumRatAtCoolPeak;
 									SupTemp = FinalSysSizing( CurSysNum ).PrecoolTemp;
 									SupHumRat = FinalSysSizing( CurSysNum ).PrecoolHumRat;
 								} else { // coil is on the main air loop
 									SupTemp = FinalSysSizing( CurSysNum ).CoolSupTemp;
 									SupHumRat = FinalSysSizing( CurSysNum ).CoolSupHumRat;
 									if ( PrimaryAirSystem( CurSysNum ).NumOACoolCoils == 0 ) { // there is no precooling of the OA stream
-										MixTemp = FinalSysSizing( CurSysNum ).CoolMixTemp;
-										MixHumRat = FinalSysSizing( CurSysNum ).CoolMixHumRat;
+										MixTemp = FinalSysSizing( CurSysNum ).MixTempAtCoolPeak;
+										MixHumRat = FinalSysSizing( CurSysNum ).MixHumRatAtCoolPeak;
 									} else { // there is precooling of OA stream
 										if ( VolFlowRate > 0.0 ) {
 											OutAirFrac = FinalSysSizing( CurSysNum ).DesOutAirVolFlow / VolFlowRate;
 										} else {
 											OutAirFrac = 1.0;
 										}
 										OutAirFrac = min( 1.0, max( 0.0, OutAirFrac ) );
-										MixTemp = OutAirFrac * FinalSysSizing( CurSysNum ).PrecoolTemp + ( 1.0 - OutAirFrac ) * FinalSysSizing( CurSysNum ).CoolRetTemp;
-										MixHumRat = OutAirFrac * FinalSysSizing( CurSysNum ).PrecoolHumRat + ( 1.0 - OutAirFrac ) * FinalSysSizing( CurSysNum ).CoolRetHumRat;
+										MixTemp = OutAirFrac * FinalSysSizing( CurSysNum ).PrecoolTemp + ( 1.0 - OutAirFrac ) * FinalSysSizing( CurSysNum ).RetTempAtCoolPeak;
+										MixHumRat = OutAirFrac * FinalSysSizing( CurSysNum ).PrecoolHumRat + ( 1.0 - OutAirFrac ) * FinalSysSizing( CurSysNum ).RetHumRatAtCoolPeak;
 									}
 								}
-								OutTemp = FinalSysSizing( CurSysNum ).CoolOutTemp;
+								OutTemp = FinalSysSizing( CurSysNum ).OutTempAtCoolPeak;
 								rhoair = PsyRhoAirFnPbTdbW( StdBaroPress, MixTemp, MixHumRat, RoutineName );
 								MixEnth = PsyHFnTdbW( MixTemp, MixHumRat );
 								MixWetBulb = PsyTwbFnTdbWPb( MixTemp, MixHumRat, StdBaroPress, RoutineName );

src/EnergyPlus/DataSizing.cc

@@ -60,6 +60,16 @@ namespace DataSizing {
 	int const NonCoincident( 1 );
 	int const Coincident( 2 );
 
+	// parameters for Cooling Peak Load TYpe
+	int const SensibleCoolingLoad( 1 );
+	int const TotalCoolingLoad( 2 );
+
+	// parameters for Central Cooling Capacity Control Method
+	int const VAV( 1 );
+	int const Bypass( 2 );
+	int const VT( 3 );
+	int const OnOff( 4 );
+
 	// paramters for supply air flow rate method
 	int const SupplyAirTemperature( 1 );
 	int const TemperatureDifference( 2 );
@@ -180,6 +190,7 @@ namespace DataSizing {
 	Real64 DataDesInletAirHumRat( 0.0 ); // coil inlet air humidity ratio used for warning messages
 	Real64 DataDesInletAirTemp( 0.0 ); // coil inlet air temperature used for warning messages
 	Real64 DataDesOutletAirTemp( 0.0 ); // coil outlet air temperature used for sizing
+	Real64 DataDesOutletAirHumRat( 0.0 ); // coil air outlet humidity ratio used in sizing calculations [kg water / kg dry air]
 	Real64 DataCoolCoilCap( 0.0 ); // cooling coil capacity used for sizing with scalable inputs [W]
 	Real64 DataFlowUsedForSizing( 0.0 ); // air flow rate used for sizing with scalable inputs [m3/s]
 	Real64 DataAirFlowUsedForSizing( 0.0 ); // air flow rate used for sizing with scalable inputs [m3/s]
@@ -225,6 +236,7 @@ namespace DataSizing {
 	FArray2D< SystemSizingData > SysSizing; // Data array for system sizing (all data)
 	FArray1D< SystemSizingData > FinalSysSizing; // Data array for system sizing (max heat/cool)
 	FArray1D< SystemSizingData > CalcSysSizing; // Data array for system sizing (max heat/cool)
+	FArray1D< SysSizPeakDDNumData > SysSizPeakDDNum; // data array for peak des day indices 
 	FArray1D< TermUnitSizingData > TermUnitSizing; // Data added in sizing routines
 	FArray1D< ZoneEqSizingData > ZoneEqSizing; // Data added in zone eq component sizing routines
 	FArray1D< ZoneEqSizingData > UnitarySysEqSizing; // Data added in unitary system sizing routines