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Re: [EnergyPlus_Support] Re: PTHP requires air loop?



I think you can use a single water loop for heating. Essentially they will use the same energy since the building load is the same, provided your boiler operates at the same efficiency at partial load. 

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On Nov 11, 2014, at 10:17, Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

If you are modeling someone else's design, then model the equipment they have selected.  For you, that means 60 different water loops.
Perhaps the PTHP is needed for supplemental heating, as you indicate.

On Tue, Nov 11, 2014 at 10:03 AM, hjang35@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 


Thank you for your reply.

Yes, I agree with your comments that there are many thermal zones and boilers more than the building needed.

But, the situation of the building is that all apartment units (each unit 85m2) are equipped with an individual gas boiler (21kW) so that each hot water loop in each apartment unit connects a radiant floor object and a boiler.  As you mentioned, they are listed in ZoneHVAC:EquipmentList for each zone.

 In terms of PTHP, it is mainly used for space cooling in summer and for subsidiary heating in winter.  If the system is only used for cooling, should I choose PTAC ?










--

 

James V Dirkes II, PE, BEMP, LEED AP
The Building Performance Team
1631 Acacia Drive, Grand Rapids, MI 49504
(M) 616 450 8653

The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just.



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Posted by: HJ <hj_630@xxxxxxxxx>


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