[Bldg-sim] WSHP

[Brian Fountain]

Ensure your fan operation is consistently "constant".  If fans are 
"intermittent", OA is only introduced when the fan is on -- and the fan 
run hours are likely different between the two system types depending on 
capacity & control -- which will skew your results.

Chris Mullinax 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>
>
>  
>
>  
>
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