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[EnergyPlus_Support] Re: Ground source heat pump hot water supply T

Thank you! A further question.

We are a little confused by the Setpoint function in EnergyPlus. let's say we model a Heat Pump to supply heating to a fairly large zone with significant heating load.  For whatever reason, we model the ground heat exchanger in a wrong way so that it does not have the enough capacity to draw heat from the soil in winter.  We use the setpoint object to set the heat water supply temperature at 45 degree C.  In this case, would the temperature drop from 45 because the HX does not have enough capacity or it always stays at 45 because we use setpoint to force it at 45?

Thanks!



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I have not looked at your IDF yet. In general, GSHP do not have large heating capacity.  If the Winter ground temperature is still at 18°C. it should work well.  You may try increasing the capacity of the heat pump and the GSHE. Replace the HP with District heating and see what is the heating  capacity required.
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>  Dr. Li   
>  To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: xing.shi.2006@...
> Date: Tue, 9 Aug 2011 21:09:42 +0800
> Subject: [EnergyPlus_Support] Ground source heat pump hot water supply T
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>       We are modeling a 5 story building with two chillers and one ground source heat pump.  Two chillers and the heat pump provide cooling in summer and the heat pump alone provides heating in winter.   
> We tried to use the Controller:WaterCoil object to vary the heating coil supply water flow rate to change the heat provided to the zone.  The heating supply water T is set to 45 degree C using SetpointManager:Scheduled and the node applied is HW Supply Outlet Node.
>  We did not get any severe error.  However, in winter we found that the HOT WATER LOOP:Plant Loop OutletNode Temperature [C](Hourly) varied from 45 degree C down to quite low.  We were not sure about why this happend.
>  Please help.  Attached is the IDF file.  Thanks! XS
>




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