Hello, when I insert a WaterHeater:HeatPump:PumpedCondenser in the loop, I have two problems:
- the water temperature doesn't respect the setpoint temperature imposed on the loop (SetpointManager:OutdoorAirReset)
- the Water Heater Heat Transfer Rate in the source side is really different from the Heat Transfer Rate in the use side.
Can you tell me why? And with this type of heat pump, the heater is considered intern to the tank, so is right that inlet and outlet temperature of tank in the source side are the same, or is in parallel with this, so the source side inlet water temperature should be the hot water heated by heat pump condenser?
Below there is a part of the text of idf file.
Thanks
WaterHeater:Stratified,
HP Tank, !- Name
, !- End-Use Subcategory
3, !- Tank Volume {m3}
2.6, !- Tank Height {m}
VerticalCylinder, !- Tank Shape
, !- Tank Perimeter {m}
90, !- Maximum Temperature Limit {C}
MasterSlave, !- Heater Priority Control
SetHPtank_1 Temp, !- Heater 1 Setpoint Temperature Schedule Name
2, !- Heater 1 Deadband Temperature Difference {deltaC}
338000, !- Heater 1 Capacity {W}
2.4, !- Heater 1 Height {m}
SetHPtank_2 Temp, !- Heater 2 Setpoint Temperature Schedule Name
2, !- Heater 2 Deadband Temperature Difference {deltaC}
0, !- Heater 2 Capacity {W}
0.266, !- Heater 2 Height {m}
Electricity, !- Heater Fuel Type
1, !- Heater Thermal Efficiency
8.3, !- Off Cycle Parasitic Fuel Consumption Rate {W}
Electricity, !- Off Cycle Parasitic Fuel Type
0, !- Off Cycle Parasitic Heat Fraction to Tank
1, !- Off Cycle Parasitic Height {m}
8.3, !- On Cycle Parasitic Fuel Consumption Rate {W}
Electricity, !- On Cycle Parasitic Fuel Type
0, !- On Cycle Parasitic Heat Fraction to Tank
1, !- On Cycle Parasitic Height {m}
Outdoors, !- Ambient Temperature Indicator
, !- Ambient Temperature Schedule Name
, !- Ambient Temperature Zone Name
Centrale termofrigorifera, !- Ambient Temperature Outdoor Air Node Name
0.7878, !- Uniform Skin Loss Coefficient per Unit Area to Ambient Temperature {W/m2-K}
0, !- Skin Loss Fraction to Zone
, !- Off Cycle Flue Loss Coefficient to Ambient Temperature {W/K}
0, !- Off Cycle Flue Loss Fraction to Zone
, !- Peak Use Flow Rate {m3/s}
, !- Use Flow Rate Fraction Schedule Name
, !- Cold Water Supply Temperature Schedule Name
HW SL BufferHeatPump Inlet, !- Use Side Inlet Node Name
HW SL BufferHeatPump Outlet, !- Use Side Outlet Node Name
1, !- Use Side Effectiveness
0.2, !- Use Side Inlet Height {m}
2.4, !- Use Side Outlet Height {m}
HW Source HeatPump Outlet, !- Source Side Inlet Node Name
HW Source HeatPump Inlet,!- Source Side Outlet Node Name
1, !- Source Side Effectiveness
2.4, !- Source Side Inlet Height {m}
0.2, !- Source Side Outlet Height {m}
Fixed, !- Inlet Mode
autosize, !- Use Side Design Flow Rate {m3/s}
, !- Source Side Design Flow Rate {m3/s}
, !- Indirect Water Heating Recovery Time {hr}
12; !- Number of
NodesNodes
Coil:WaterHeating:AirToWaterHeatPump:Pumped,
HP Evaporetor, !- Name
338000, !- Rated Heating Capacity {W}
3.26, !- Rated COP {W/W}
0.7, !- Rated Sensible Heat Ratio
7, !- Rated Evaporator Inlet Air Dry-Bulb Temperature {C}
6, !- Rated Evaporator Inlet Air Wet-Bulb Temperature {C}
40, !- Rated Condenser Inlet Water Temperature {C}
36.797, !- Rated Evaporator Air Flow Rate {m3/s}
0.0133, !- Rated Condenser Water Flow Rate {m3/s}
Yes, !- Evaporator Fan Power Included in Rated COP
No, !- Condenser Pump Power Included in Rated COP
No, !- Condenser Pump Heat Included in Rated Heating Capacity and Rated COP
3600, !- Condenser Water Pump Power {W}
0.2, !- Fraction of Condenser Pump Heat to Water
HPEvapAirInletNode, !- Evaporator Air Inlet Node Name
HPEvapAirOutletNode, !- Evaporator Air Outlet Node Name
HW Source HeatPump Inlet,!- Condenser Water Inlet Node Name
HW Source HeatPump Outlet, !- Condenser Water Outlet Node Name
400, !- Crankcase Heater Capacity {W}
5, !- Maximum Ambient Temperature for Crankcase Heater Operation {C}
WetBulbTemperature, !- Evaporator Air Temperature Type for Curve Objects
HPWH-Htg-Cap-fT, !- Heating Capacity Function of Temperature Curve Name
, !- Heating Capacity Function of Air Flow Fraction Curve Name
, !- Heating Capacity Function of Water Flow Fraction Curve Name
HPWH-Htg-COP-fT, !- Heating COP Function of Temperature Curve Name
, !- Heating COP Function of Air Flow Fraction Curve Name
, !- Heating COP Function of Water Flow Fraction Curve Name
HPWH-COP-fPLR; !- Part Load Fraction Correlation Curve
NameName
WaterHeater:HeatPump:PumpedCondenser,
HeatPump AirWater, !- Name
HeatingSeason, !- Availability Schedule Name
SetHeatPumpCut Temp, !- Compressor Setpoint Temperature Schedule Name
2, !- Dead Band Temperature Difference {deltaC}
HW Source HeatPump Inlet,!- Condenser Water Inlet Node Name
HW Source HeatPump Outlet, !- Condenser Water Outlet Node Name
0.0133, !- Condenser Water Flow Rate {m3/s}
36.797, !- Evaporator Air Flow Rate {m3/s}
OutdoorAirOnly, !- Inlet Air Configuration
, !- Air Inlet Node Name
, !- Air Outlet Node Name
HPEvapAirInletNode, !- Outdoor Air Node Name
HPFanAirOutletNode, !- Exhaust Air Node Name
, !- Inlet Air Temperature Schedule Name
, !- Inlet Air Humidity Schedule Name
, !- Inlet Air Zone Name
WaterHeater:Stratified, !- Tank Object Type
HP Tank, !- Tank Name
HW SL BufferHeatPump Inlet, !- Tank Use Side Inlet Node Name
HW SL BufferHeatPump Outlet, !- Tank Use Side Outlet Node Name
Coil:WaterHeating:AirToWaterHeatPump:Pumped, !- DX Coil Object Type
HP Evaporetor, !- DX Coil Name
-5, !- Minimum Inlet Air Temperature for Compressor Operation {C}
, !- Maximum Inlet Air Temperature for Compressor Operation {C}
Outdoors, !- Compressor Location
, !- Compressor Ambient Temperature Schedule Name
Fan:OnOff, !- Fan Object Type
HP Fans, !- Fan Name
DrawThrough, !- Fan Placement
, !- On Cycle Parasitic Electric Load {W}
, !- Off Cycle Parasitic Electric Load {W}
Outdoors, !- Parasitic Heat Rejection Location
, !- Inlet Air Mixer Node Name
, !- Outlet Air Splitter Node Name
, !- Inlet Air Mixer Schedule Name
, !- Tank Element Control Logic
0.9, !- Control Sensor 1 Height In Stratified Tank {m}
1, !- Control Sensor 1 Weight {dimensionless}
0.75; !- Control Sensor 2 Height In Stratified Tank
{m}{m}
Fan:OnOff,
HP Fans, !- Name
HeatingSeason, !- Availability Schedule Name
0.7, !- Fan Total Efficiency
65, !- Pressure Rise {Pa}
autosize, !- Maximum Flow Rate {m3/s}
1, !- Motor Efficiency
0, !- Motor In Airstream Fraction
HPEvapAirOutletNode, !- Air Inlet Node Name
HPFanAirOutletNode; !- Air Outlet Node
NameName
Schedule:Compact,
SetHPtank_2 Temp, !- Name
Temperature, !- Schedule Type Limits Name
Through: 12/31, !- Field 1
For: AllDays, !- Field 2
Until: 24:00, !- Field 3
45; !- Field
44
Schedule:Compact,
SetHPtank_1 Temp, !- Name
Temperature, !- Schedule Type Limits Name
Through: 4/15, !- Field 1
For: AllDays, !- Field 2
Until: 24:00, !- Field 3
45, !- Field 4
Through: 10/14, !- Field 5
For: AllDays, !- Field 6
Until: 24:00, !- Field 7
0, !- Field 8
Through: 12/31, !- Field 9
For: AllDays, !- Field 10
Until: 24:00, !- Field 11
45; !- Field
1212
Schedule:Compact,
SetHeatPumpCut Temp, !- Name
Temperature, !- Schedule Type Limits Name
Through: 4/15, !- Field 1
For: AllDays, !- Field 2
Until: 24:00, !- Field 3
52, !- Field 4
Through: 10/14, !- Field 5
For: AllDays, !- Field 6
Until: 24:00, !- Field 7
10, !- Field 8
Through: 12/31, !- Field 9
For: AllDays, !- Field 10
Until: 24:00, !- Field 11
52; !- Field
1212
PlantEquipmentList,
HW Secondary Loop Heating Source List, !- Name
WaterHeater:HeatPump:pumpedCondenser, !- Equipment 1 Object Type
HeatPump AirWater; !- Equipment 1
NameName
SetpointManager:OutdoorAirReset,
HW Secondary Loop Setpoint Manager Heating, !- Name
Temperature, !- Control Variable
45, !- Setpoint at Outdoor Low Temperature {C}
-8, !- Outdoor Low Temperature {C}
22, !- Setpoint at Outdoor High Temperature {C}
20.00, !- Outdoor High Temperature {C}
HW Secondary Loop Setpoint Manager Node List; !- Setpoint Node or NodeList
NameName
