[Bldg-sim] WSHP

[Karen Walkerman]

It may depend on the pumping and controls you have for the WSHP loop.  If
you are not using a variable speed drive pump, (and three-way valves) for
the WSHP system, then this would account for additional pumping energy.
What program are you using?  Using eQuest, I've had good results with WSHP
systems, it's possible that when you change the system type, it's not
changing over very well.

Can you send results (or if you're using eQuest, your inp and pd2 files).

--
Karen



On Mon, Oct 20, 2008 at 8:51 AM, Chris Mullinax <chris at mullinaxsolutions.com
> wrote:

>  On three or four occasions I have used equest to compare traditional,
> small split systems (three to five ton) to a water source heat pump system
> in the same building.  The WSHP system uses a cooling tower and a small
> boiler.
>
>
>
> I tried to make everything else identical by creating the first model and
> saving a copy of that model and changing the HVAC type from split system to
> WSHP.
>
>
>
> On every occasion, split systems end up using significantly less energy
> than water source heat pumps systems.
>
> The WSHPs are typically 16 SEER, the Splits 13 SEER.
>
>
>
>
>
> I know there is additional energy associated with pumps and cooling towers.
> Is this a typical result?
>
> It seems I've heard a lot of high about the efficiency of water source heat
> pumps.
>
>
>
>
>
> Thanks,
>
> Chris Mullinax, P.E. LEED AP
>
>
>
> pn: 770-387-1334
>
> fx:  770-387-1383
>
> chris at mullinaxsolutions.com
>
> www.mullinaxsolutions.com
>
>
>
>
>
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