[Bldg-sim] WSHP

David S Eldridge DSE at grummanbutkus.com
Mon Oct 20 07:03:22 PDT 2008

The energy end-use comparison report should show where the two runs
are using energy differently.

This would help you determine if the difference is cooling, heating,
pumps or towers.

Also check that your models performed equally in terms of unmet hours.


Sent from my iPhone

On Oct 20, 2008, at 7:50 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<mailto:chris at mullinaxsolutions.com>
> www.mullinaxsolutions.com<http://www.mullinaxsolutions.com>
> <ATT00002>

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