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Re: [EnergyPlus_Support] WaterHeater:HeatPump not heating from heating element





Jamie,

You mean aside from the SVG drawing that is generated when you run E+? (I suggest using Inkspace to view SVGs, an open source tool for vectorized drawings, makes your life a lot easier than IE or else...)

There's one in Eppy but between getting it to work (which I did painfully) and the way you use it, I find it's only useful for small plant loop. When you start getting something complex or with many systems, you're better off with regular SVG.



--
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13
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2014-07-23 13:48 GMT+02:00 jamiebull1@xxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>:
 

I'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? 


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;





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Posted by: Julien Marrec <julien.marrec@xxxxxxxxx>


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