idd change, input reading and testing of Coil:WaterHeating:AWHP

NREL · Apr 26, 2023 · 636e83c · 636e83c · nrel-bot · Apr 27, 2023
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commit 636e83c
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Showing 4 changed files with 257 additions and 7 deletions.
diff --git a/idd/Energy+.idd.in b/idd/Energy+.idd.in
@@ -58358,7 +58358,7 @@ Coil:WaterHeating:AirToWaterHeatPump:Pumped,
        \note ff = fraction of the rated condenser water flow rate.
        \note Use curve coefficients of 1,0,0 or leave this field blank when neglecting performance impacts
        \note due to variations in water flow rate fraction.
-  A16; \field Part Load Fraction Correlation Curve Name
+  A16, \field Part Load Fraction Correlation Curve Name
        \type object-list
        \object-list UnivariateFunctions
        \note Part Load Fraction Correlation (function of part load ratio) should be quadratic or cubic.
@@ -58367,6 +58367,10 @@ Coil:WaterHeating:AirToWaterHeatPump:Pumped,
        \note PLR = part load ratio (heating delivered/steady state heating capacity).
        \note Use curve coefficients of 1,0,0 or leave this field blank when neglecting performance impacts
        \note due to variations in part load ratio.
+  A17; \field Outdoor Temperature Dependent Crankcase Heater Capacity Curve Name
+       \note A Curve:* or Table:Lookup object encoding the relationship between
+       \note the crankcase heater capacity and the outdoor air temperature. When this field is
+       \note missing or empty, constant crankcase heater capacity will be assumed.
 
 Coil:WaterHeating:AirToWaterHeatPump:Wrapped,
        \memo Heat pump water heater (HPWH) heating coil, air-to-water direct-expansion (DX)
@@ -58514,7 +58518,7 @@ Coil:WaterHeating:AirToWaterHeatPump:Wrapped,
        \note ff = fraction of the rated evaporator air flow rate.
        \note Use curve coefficients of 1,0,0 or leave this field blank when neglecting performance impacts
        \note due to variations in air flow rate fraction.
-  A10; \field Part Load Fraction Correlation Curve Name
+  A10, \field Part Load Fraction Correlation Curve Name
        \type object-list
        \object-list UnivariateFunctions
        \note Part Load Fraction Correlation (function of part load ratio) should be quadratic or cubic.
@@ -58523,6 +58527,10 @@ Coil:WaterHeating:AirToWaterHeatPump:Wrapped,
        \note PLR = part load ratio (heating delivered/steady state heating capacity).
        \note Use curve coefficients of 1,0,0 or leave this field blank when neglecting performance impacts
        \note due to variations in part load ratio.
+  A11; \field Outdoor Temperature Dependent Crankcase Heater Capacity Curve Name
+       \note A Curve:* or Table:Lookup object encoding the relationship between
+       \note the crankcase heater capacity and the outdoor air temperature. When this field is
+       \note missing or empty, constant crankcase heater capacity will be assumed.
 
 Coil:WaterHeating:AirToWaterHeatPump:VariableSpeed,
        \memo vairlable-speed Heat pump water heater (VSHPWH) heating coil, air-to-water direct-expansion (DX)
@@ -59481,13 +59489,17 @@ Coil:WaterHeating:AirToWaterHeatPump:VariableSpeed,
        \note quadratic curve = a + b*ffa + c*ffa**2
        \note cubic curve = a + b*ffa + c*ffa**2 + d*ffa**3
        \note ffa = Fraction of the full load Air Flow
-  A70; \field Speed 10 COP Function of Water Flow Fraction Curve Name
+  A70, \field Speed 10 COP Function of Water Flow Fraction Curve Name
        \type object-list
        \object-list UnivariateFunctions
        \note Table:Lookup object can also be used
        \note quadratic curve = a + b*ffw + c*ffw**2
        \note cubic curve = a + b*ffw + c*ffw**2 + d*ffw**3
        \note ffw = Fraction of the full load Water Flow
+  A71; \field Outdoor Temperature Dependent Crankcase Heater Capacity Curve Name
+       \note A Curve:* or Table:Lookup object encoding the relationship between
+       \note the crankcase heater capacity and the outdoor air temperature. When this field is
+       \note missing or empty, constant crankcase heater capacity will be assumed.
 
 Coil:WaterHeating:Desuperheater,
        \memo Desuperheater air heating coil. The heating energy provided by this coil is reclaimed

diff --git a/src/EnergyPlus/DXCoils.cc b/src/EnergyPlus/DXCoils.cc
@@ -3428,6 +3428,10 @@ void GetDXCoils(EnergyPlusData &state)
             }
         }
 
+        if (!lAlphaBlanks(17)) {
+            thisDXCoil.CrankcaseHeaterCapacityCurveIndex = Curve::GetCurveIndex(state, Alphas(17));
+        }
+
         // assume compressor resides at the inlet to the DX Coil
         thisDXCoil.CondenserInletNodeNum(1) = thisDXCoil.AirInNode;
 
@@ -3809,6 +3813,11 @@ void GetDXCoils(EnergyPlusData &state)
             }
         }
 
+        // Coil:WaterHeating:AirToWaterHeatPump:Wrapped
+        if (!lAlphaBlanks(11)) {
+            thisDXCoil.CrankcaseHeaterCapacityCurveIndex = Curve::GetCurveIndex(state, Alphas(11));
+        }
+
         // assume compressor resides at the inlet to the DX Coil
         thisDXCoil.CondenserInletNodeNum(1) = thisDXCoil.AirInNode;
 

diff --git a/src/EnergyPlus/VariableSpeedCoils.cc b/src/EnergyPlus/VariableSpeedCoils.cc
@@ -3034,6 +3034,11 @@ namespace VariableSpeedCoils {
                     state.dataVariableSpeedCoils->VarSpeedCoil(DXCoilNum).MSRatedTotCap(I);
             }
 
+            if (!lAlphaBlanks(71)) {
+                state.dataVariableSpeedCoils->VarSpeedCoil(DXCoilNum).CrankcaseHeaterCapacityCurveIndex =
+                    Curve::GetCurveIndex(state, AlphArray(71));
+            }
+
             // CurrentModuleObject = "Coil:Waterheating:Airtowaterheatpump:Variablespeed"
             SetupOutputVariable(state,
                                 "Cooling Coil Electricity Energy",