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Re: [EnergyPlus_Support] air-water heat pump and two boilers





Are you getting any errors which may hint to the problem? Somehow the unit doesn't think it needs to heat anything... 

On Fri, 20 Apr 2018, 19:43 fpasserini.tn@xxxxxxxxx [EnergyPlus_Support], <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

I have modeled a hot water loop where in the supply side there are an air-water heat pump and two boilers. They are connected in parallel.
Although in PlantEquipmentList I have listed the heat pump as the first one, it works never (â??Cooling Coil Total Water Heating Rateâ?? and â??Cooling Coil Water Heating Electric Powerâ?? are equal to 0 constantly; â??Cooling Coil Crankcase Heater Electric Powerâ?? is equal to 100W, which is â??Crankcase Heater Capacityâ?? in Coil:WaterHeating:AirToWaterHeatPump:Pumped) while the boilers provide the needed heat.

PlantEquipmentList,
HW Loop Scheme 1 Range 1 Equipment List, !- Name
WaterHeater:HeatPump:PumpedCondenser, !- Equipment 1 Object Type
ScheduledHeatPumpWaterHeater, !- Equipment 1 Name
Boiler:HotWater, !- Equipment 2 Object Type
Boiler, !- Equipment 2 Name
Boiler:HotWater, !- Equipment 3 Object Type
Boiler/1; !- Equipment 3 Name

Theoretically I have copied parameters and curves from the example file WaterHeaterHeatPumpStratifiedTank.idf

I have added SetpointManager:Scheduled both for the hot water loop and for the single pieces of equipment.

SetpointManager:Scheduled,
Boiler/1Setpoint Manager,!- Name
Temperature, !- Control Variable
Hot Water Set Point Temp Schedule, !- Schedule Name
Boiler/1 Outlet Node; !- Setpoint Node or NodeList Name

SetpointManager:Scheduled,
BoilerSetpoint Manager, !- Name
Temperature, !- Control Variable
Hot Water Set Point Temp Schedule, !- Schedule Name
Boiler Outlet Node; !- Setpoint Node or NodeList Name

SetpointManager:Scheduled,
Tank Setpoint Manager, !- Name
Temperature, !- Control Variable
Hot Water Set Point Temp Schedule, !- Schedule Name
Tank use side outlet node; !- Setpoint Node or NodeList Name

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 4

As weather data I'm using ITA_Bolzano.160200_IGDG.epw
Attached the file.
Best Regards




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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>


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