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Re: [EnergyPlus_Support] Fwd: Central Heat Production vs terminal units
Look at the example file HeatPumpWaterHeater.idf. In your file, hook up
the plant loop to the USE SIDE nodes in the WaterHeater:Mixed object.
Just use a 1 for the use side effectiveness value.
HEAT PUMP:WATER HEATER,
Zone5HeatPumpWaterHeater,!- Heat Pump Name
HeatPumpWaterHeaterSch, !- Availability Schedule Name
HPWHTempSch, !- Heat Pump Compressor Set Point
Temperature Schedule Name
2.0, !- Dead Band Temperature Difference {deltaC}
HPWHWaterInletNode, !- Condenser Water Inlet Node Name
HPWHWaterOutletNode, !- Condenser Water Outlet Node Name
autocalculate, !- Condenser Water Volumetric Flow Rate {m3/s}
autocalculate, !- Evaporator Air Volumetric Flow Rate {m3/s}
Zone and Outdoor Air, !- Inlet Air Configuration
HPWHAirOutletNode, !- Heat Pump Air Inlet Node Name
HPWHAirInletNode, !- Heat Pump Air Outlet Node Name
HPWHOutdoorAirInletNode, !- Outside Air Node Name
HPWHExhaustAirOutletNode,!- Exhaust Air Node Name
, !- Inlet Air Temperature Schedule Name
, !- Inlet Air Humidity Schedule Name
SPACE5-1, !- Inlet Air Zone Name
Water Heater:Mixed, !- Water Heater Tank Type
HPWHTank, !- Water Heater Tank Name
, !- Water Heater Tank Use Side Inlet Node Name
, !- Water Heater Tank Use Side Outlet Node Name
Coil:DX:HeatPumpWaterHeater, !- DX Coil Type
HPWHDXCoil, !- DX Coil Name
5.0, !- Minimum Inlet Air Temperature for Heat
Pump Compressor Operation {C}
Zone, !- Compressor Location
, !- Compressor Ambient Temperature Schedule Name
Fan:Simple:OnOff, !- Fan Type
HPWHFan, !- Fan Name
Draw Through, !- Fan Placement
15.0, !- On-Cycle Parasitic Electric Load {W}
5.0, !- Off-Cycle Parasitic Electric Load {W}
Zone, !- Parasitic Heat Rejection Location
HPWHInletAirMixerNode, !- Inlet Air Mixer Node Name
HPWHOutletAirSplitterNode, !- Outlet Air Splitter Node Name
HPWHMixerInletAirSch; !- Inlet Air Mixer Schedule Name
WATER HEATER:MIXED,
HPWHTank, !- Name
0.3785, !- Tank Volume {m3}
Hot Water Setpoint Temp Schedule, !- Setpoint Temperature Schedule
2.0, !- Deadband Temperature Difference {deltaC}
82.2222, !- Maximum Temperature Limit {C}
CYCLE, !- Heater Control Type
5000, !- Heater Maximum Capacity {W}
0, !- Heater Minimum Capacity {W}
, !- Heater Ignition Minimum Flow Rate {m3/s}
, !- Heater Ignition Delay {s}
ELECTRICITY, !- Heater Fuel Type
0.95, !- Heater Thermal Efficiency
, !- Part Load Factor Curve
10, !- Off-Cycle Parasitic Fuel Consumption
Rate {W}
ELECTRICITY, !- Off-Cycle Parasitic Fuel Type
0, !- Off-Cycle Parasitic Heat Fraction To Tank
30, !- On-Cycle Parasitic Fuel Consumption Rate {W}
ELECTRICITY, !- On-Cycle Parasitic Fuel Type
0, !- On-Cycle Parasitic Heat Fraction To Tank
ZONE, !- Ambient Temperature Indicator
, !- Ambient Temperature Schedule
SPACE5-1, !- Ambient Temperature Zone
, !- Ambient Temperature Outside Air Node
2.0, !- Off-Cycle Loss Coefficient To Ambient
Temperature {W/K}
1.0, !- Off-Cycle Loss Fraction To Zone
2.0, !- On-Cycle Loss Coefficient To Ambient
Temperature {W/K}
1.0, !- On-Cycle Loss Fraction To Zone
0.00379, !- Peak Volumetric Use Flow Rate {m3/s}
Hot Water Demand Schedule, !- Use Flow Rate Fraction Schedule
, !- Cold Water Supply Temperature Schedule
, !- Use Side Inlet Node
, !- Use Side Outlet Node
, !- Use Side Effectiveness
HPWHWaterOutletNode, !- Source Side Inlet Node
HPWHWaterInletNode, !- Source Side Outlet Node
0.95; !- Source Side Effectiveness
COIL:DX:HEATPUMPWATERHEATER,
HPWHDXCoil, !- Coil Name
4000.0, !- Heating Capacity {W}
3.2, !- Rated COP {W/W}
0.6956, !- Rated SHR (gross)
29.44, !- Rated Evaporator Inlet Air Dry-Bulb
Temperature {C}
22.22, !- Rated Evaporator Inlet Air Wet-Bulb
Temperature {C}
55.72, !- Rated Condenser Inlet Water Temperature {C}
autocalculate, !- Rated Evaporator Air Volumetric Flow
Rate {m3/s}
autocalculate, !- Rated Condenser Water Volumetric 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
150.0, !- Condenser Water Pump Power {W}
0.1, !- Fraction of Condenser Pump Heat to Water
HPWHInletAirMixerNode, !- Evaporator Air Inlet Node Name
HPWHDXCoilAirOutletNode, !- Evaporator Air Outlet Node Name
HPWHWaterInletNode, !- Condenser Water Inlet Node Name
HPWHWaterOutletNode, !- Condenser Water Outlet Node Name
100.0, !- Crankcase Heater Capacity {W}
5.0, !- Maximum Ambient Temperature for
Crankcase Heater Operation {C}
wet-bulb temperature, !- Evaporator Air Temperature Type for
Curve Objects
HPWHHeatingCapFTemp, !- Heating Capacity Modifier Curve Name
(function of temperature)
, !- Heating Capacity Modifier Curve Name
(function of air flow fraction)
, !- Heating Capacity Modifier Curve Name
(function of water flow fraction)
HPWHHeatingCOPFTemp, !- Heating COP Modifier Curve Name
(function of temperature)
, !- Heating COP Modifier Curve Name
(function of air flow fraction)
, !- Heating COP Modifier Curve Name
(function of water flow fraction)
HPWHPLFFPLR; !- Part Load Fraction Correlation Name
(function of part load ratio)
anarui.oliveira wrote:
>
> Maybe this additional information helps:
>
> ...I started out with a model of a boiler created with Compact HVAC,
> and then expanded it and substituted the boiler by the Heat Pump Water
> Heater.
> The expanded model with the boiler works fine... so I guess I missed
> something when adapting it to a model with a heat pump?...
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, "anarui.oliveira"
> <anarui.oliveira@...> wrote:
>
> Hi everyone.
>
> I modelled a system with a central Heat pump (air-to-water), producing
> heat for a hot water loop serving 3 Air Treatment Units and some
> terminal unit ventilators, but the thermal heating rate/energy produced
> by the central heat pump is much (2-3 times) higher than the sum of the
> heating rates/energy of all the coils in the ATUs and terminal units...
> It seems as if the control os this central unit is not performing
> properly, but I can't figure out why...
>
> Could anyone help?
>
> Thanks in advance,
> Ana Rui.
>
> --- End forwarded message ---
>
>
--
Richard A. Raustad
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University of Central Florida
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