Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13
www.julienmarrec.com
DoYouBuzz : www.doyoubuzz.com/julien-marrec_1
LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr
ÂI'm having trouble setting up a WaterHeater:HeatPump object. The demand is met when the external temperature is high enough for the heat pump to function, but since for much of the year the temperature is lower than the 11 C minimum inlet air temperature cut-off point there is no heating to the tank during those periods.
I have specified the suggested 4500 W elements for the two heaters in the tank but they don't seem to be functioning. What am I missing here?Â
As a second question does this list have any useful tools for debugging problems with plant systems - in particular any tools for showing a diagram which would point out missing links or mismatched nodes?
! ================ SUPPLY SIDE - WATER HEATER HEAT PUMP ======================
 WaterHeater:HeatPump,
  Water Heater Heat Pump, !- Name
  ,       !- Availability Schedule Name
  Water Heater Heat Pump Temp Schedule,     !- Compressor Setpoint Temperature Schedule Name
  2.0,           !- Dead Band Temperature Difference {deltaC}
  Heat Pump Water Inlet Node,  !- Condenser Water Inlet Node Name
  Heat Pump Water Outlet Node,  !- Condenser Water Outlet Node Name
  autocalculate,        !- Condenser Water Flow Rate {m3/s}
  autocalculate,         !- Evaporator Air Flow Rate {m3/s}
  OutdoorAirOnly,      !- Inlet Air Configuration
  ,             !- Air Inlet Node Name
  ,             !- Air Outlet Node Name
  OutsideAirInletNodes,   !- Outdoor Air Node Name
  HPPlantAirOutletNode,   !- Exhaust Air Node Name
  ,             !- Inlet Air Temperature Schedule Name
  ,             !- Inlet Air Humidity Schedule Name
  ,             !- Inlet Air Zone Name
  WaterHeater:Stratified,  !- Tank Object Type
  Water Heater Tank,    !- Tank Name
  Water Heater Heat Pump Inlet Node,  !- Tank Use Side Inlet Node Name
  Water Heater Heat Pump Outlet Node,  !- Tank Use Side Outlet Node Name
  Coil:WaterHeating:AirToWaterHeatPump,  !- DX Coil Object Type
  HPWHPlantDXCoil,     !- DX Coil Name
  11,           !- Minimum Inlet Air Temperature for Compressor Operation {C}
  Outdoors,         !- Compressor Location
  ,             !- Compressor Ambient Temperature Schedule Name
  Fan:OnOff,        !- Fan Object Type
  HPWHPlantFan,       !- Fan Name
  BlowThrough,       !- Fan Placement
  ,             !- On Cycle Parasitic Electric Load {W}
  ,             !- Off Cycle Parasitic Electric Load {W}
  ,             !- Parasitic Heat Rejection Location
  ,             !- Inlet Air Mixer Node Name
  ,             !- Outlet Air Splitter Node Name
  ,             !- Inlet Air Mixer Schedule Name
  UseOutlet;         !- Control Sensor Location In Stratified Tank
 WaterHeater:Stratified,
  Water Heater Tank,    !- Name
  Water Heater,       !- End-Use Subcategory
  StorageTankVolume[],          !- Tank Volume {m3}
  1.4,           !- Tank Height {m}
  VerticalCylinder,     !- Tank Shape
  ,             !- Tank Perimeter {m}
  82.2222,         !- Maximum Temperature Limit {C}
  MasterSlave,       !- Heater Priority Control
  Hot Water Set Point Temp Schedule,  !- Heater 1 Setpoint Temperature Schedule Name
  2.0,           !- Heater 1 Deadband Temperature Difference {deltaC}
  4500, !- Heater 1 Capacity {W}
  ,           !- Heater 1 Height {m}
  Hot Water Set Point Temp Schedule,  !- Heater 2 Setpoint Temperature Schedule Name
  2.0,           !- Heater 2 Deadband Temperature Difference {deltaC}
  4500, !- Heater 2 Capacity {W}
  ,           !- Heater 2 Height {m}
  ELECTRICITY,       !- Heater Fuel Type
  1.0,           !- Heater Thermal Efficiency
  10,            !- Off Cycle Parasitic Fuel Consumption Rate {W}
  ELECTRICITY,       !- Off Cycle Parasitic Fuel Type
  0,            !- Off Cycle Parasitic Heat Fraction to Tank
  ,             !- Off Cycle Parasitic Height {m}
  10,            !- On Cycle Parasitic Fuel Consumption Rate {W}
  ELECTRICITY,       !- On Cycle Parasitic Fuel Type
  0,            !- On Cycle Parasitic Heat Fraction to Tank
  ,             !- On Cycle Parasitic Height {m}
  Zone,         !- Ambient Temperature Indicator
  ,  !- Ambient Temperature Schedule Name
  Zone1,             !- Ambient Temperature Zone Name
  ,             !- Ambient Temperature Outdoor Air Node Name
  0.846,          !- Uniform Skin Loss Coefficient per Unit Area to Ambient Temperature {W/m2-K}
  ,             !- Skin Loss Fraction to Zone
  ,             !- Off Cycle Flue Loss Coefficient to Ambient Temperature {W/K}
  ,             !- 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
  Water Heater Heat Pump Inlet Node,  !- Use Side Inlet Node Name
  Water Heater Heat Pump Outlet Node,  !- Use Side Outlet Node Name
  1.0,           !- Use Side Effectiveness
  ,             !- Use Side Inlet Height {m}
  ,             !- Use Side Outlet Height {m}
  Heat Pump Water Outlet Node,  !- Source Side Inlet Node Name
  Heat Pump Water Inlet Node,  !- Source Side Outlet Node Name
  ,             !- Source Side Effectiveness
  ,             !- Source Side Inlet Height {m}
  ,             !- Source Side Outlet Height {m}
  FIXED,          !- Inlet Mode
  autosize,         !- Use Side Design Flow Rate {m3/s}
  autosize,       !- Source Side Design Flow Rate {m3/s}
  ,             !- Indirect Water Heating Recovery Time {hr}
  6,            !- Number of Nodes
  0.1,           !- Additional Destratification Conductivity {W/m-K}
  0.15,           !- Node 1 Additional Loss Coefficient {W/m2-K}
  ,             !- Node 2 Additional Loss Coefficient {W/m2-K}
  ,             !- Node 3 Additional Loss Coefficient {W/m2-K}
  ,             !- Node 4 Additional Loss Coefficient {W/m2-K}
  ,             !- Node 5 Additional Loss Coefficient {W/m2-K}
  0.1;           !- Node 6 Additional Loss Coefficient {W/m2-K}
 Coil:WaterHeating:AirToWaterHeatPump,
  HPWHPlantDXCoil,     !- Name
  11000,         !- Rated Heating Capacity {W}
  3.2,           !- Rated COP {W/W}
  0.85,          !- Rated Sensible Heat Ratio
  ,          !- Rated Evaporator Inlet Air Dry-Bulb Temperature {C}
  ,          !- Rated Evaporator Inlet Air Wet-Bulb Temperature {C}
  ,          !- Rated Condenser Inlet Water Temperature {C}
  autocalculate,         !- Rated Evaporator Air Flow Rate {m3/s}
  autocalculate,        !- Rated Condenser Water Flow Rate {m3/s}
  No,            !- 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
  0,          !- Condenser Water Pump Power {W}
  0.2,           !- Fraction of Condenser Pump Heat to Water
  HPPlantFanAirOutletNode, !- Evaporator Air Inlet Node Name
  HPPlantAirOutletNode,   !- Evaporator Air Outlet Node Name
  Heat Pump Water Inlet Node,  !- Condenser Water Inlet Node Name
  Heat Pump Water Outlet Node,  !- Condenser Water Outlet Node Name
  100.0,          !- Crankcase Heater Capacity {W}
  5.0,           !- Maximum Ambient Temperature for Crankcase Heater Operation {C}
  WetBulbTemperature,    !- Evaporator Air Temperature Type for Curve Objects
  ,   !- 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
  ,   !- 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
  ;       !- Part Load Fraction Correlation Curve Name
 Curve:Biquadratic,
  HPWHHeatingCapFTemp,   !- Name
  0.369827,         !- Coefficient1 Constant
  0.043341,         !- Coefficient2 x
  -0.00023,         !- Coefficient3 x**2
  0.000466,         !- Coefficient4 y
  0.000026,         !- Coefficient5 y**2
  -0.00027,         !- Coefficient6 x*y
  0.0,           !- Minimum Value of x
  40.0,           !- Maximum Value of x
  20.0,           !- Minimum Value of y
  90.0,           !- Maximum Value of y
  ,             !- Minimum Curve Output
  ,             !- Maximum Curve Output
  Temperature,       !- Input Unit Type for X
  Temperature,       !- Input Unit Type for Y
  Dimensionless;      !- Output Unit Type
 Curve:Biquadratic,
  HPWHHeatingCOPFTemp,   !- Name
  1.19713,         !- Coefficient1 Constant
  0.077849,         !- Coefficient2 x
  -0.0000016,        !- Coefficient3 x**2
  -0.02675,         !- Coefficient4 y
  0.000296,         !- Coefficient5 y**2
  -0.00112,         !- Coefficient6 x*y
  0.0,           !- Minimum Value of x
  40.0,           !- Maximum Value of x
  20.0,           !- Minimum Value of y
  90.0,           !- Maximum Value of y
  ,             !- Minimum Curve Output
  ,             !- Maximum Curve Output
  Temperature,       !- Input Unit Type for X
  Temperature,       !- Input Unit Type for Y
  Dimensionless;      !- Output Unit Type
 Curve:Quadratic,
  HPWHPLFFPLR,       !- Name
  0.75,           !- Coefficient1 Constant
  0.25,           !- Coefficient2 x
  0.0,           !- Coefficient3 x**2
  0.0,           !- Minimum Value of x
  1.0;           !- Maximum Value of x
 Fan:OnOff,
  HPWHPlantFan,       !- Name
  ,       !- Availability Schedule Name
  0.7,           !- Fan Efficiency
  100.0,          !- Pressure Rise {Pa}
  2.6852,          !- Maximum Flow Rate {m3/s}
  0.9,           !- Motor Efficiency
  1.0,           !- Motor In Airstream Fraction
  OutsideAirInletNodes,   !- Air Inlet Node Name
  HPPlantFanAirOutletNode; !- Air Outlet Node Name
 OutdoorAir:Node,
  HPPlantAirInletNode;   !- Name
! =================== SCHEDULES ===============================
Schedule:Compact,
  Water Heater Heat Pump Setpoint Schedule,       !- Name
  Temperature,       !- Schedule Type Limits Name
  Through: 12/31,      !- Field 1
  For: WeekDays CustomDay1 CustomDay2, !- Field 2
  Until: 24:00,82.0,    !- Field 7
  For: WeekEnds Holiday,  !- Field 9
  Until: 24:00,82.0,    !- Field 10
  For: SummerDesignDay,   !- Field 12
  Until: 24:00,82.0,    !- Field 13
  For: WinterDesignDay,   !- Field 15
  Until: 24:00,82.0;    !- Field 16
 Schedule:Compact,
  Water Heater Heat Pump Temp Schedule,     !- Name
  Any Number,        !- Schedule Type Limits Name
  Through: 12/31,      !- Field 1
  For: AllDays,       !- Field 2
  Until: 24:00,60.0;    !- Field 3
 Schedule:Compact,
  Hot Water Set Point Temp Schedule,  !- Name
  Any Number,        !- Schedule Type Limits Name
  THROUGH: 12/31,      !- Field 1
  FOR: AllDays,       !- Field 2
  UNTIL: 24:00,48.89;    !- Field 3
! Water Heater Heat Pump Branch
Branch,
  Hot Water Loop HW Supply Prime Mover Branch, !- Name
  ,             !- Maximum Flow Rate {m3/s}
  ,             !- Pressure Drop Curve Name
  WaterHeater:HeatPump,   !- Component 1 Object Type
  Water Heater Heat Pump,!- Component 1 Name
  Water Heater Heat Pump Inlet Node,  !- Component 1 Inlet Node Name
  Water Heater Heat Pump Outlet Node,  !- Component 1 Outlet Node Name
  ;         !- Component 1 Branch Control Type
PlantEquipmentList,
Hot Water Loop All Equipment,
WaterHeater:HeatPump,
Water Heater Heat Pump;
NodeList,
 Hot Water Loop HW Supply Setpoint Nodes,         !- Name
 Water Heater Heat Pump Outlet Node,            !- Node Name
 Hot Water Loop HW Supply Outlet;             !- Node Name
OutdoorAir:NodeList,
OutsideAirInletNodes;
NodeList,OutsideAirInletNodes,
Outdoor air Inlet Node;
__._,_.___
Posted by: Julien Marrec <julien.marrec@xxxxxxxxx>
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