[EnergyPlus_Support] WaterHeater:HeatPump not heating from heating element

["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, &n

__._,_.___

---

Posted by: jamiebull1@xxxxxxxxxxxxxx

---

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Visit Your Group

• New Members 6

• Privacy • Unsubscribe • Terms of Use

__,_._,___