[Bldg-sim] Cooling effeciency
Karen Walkerman
kwalkerman at gmail.com
Wed Jul 9 14:15:17 PDT 2008
PTACs usually have the ability to run an economizer and WSHPs do not. I am
not sure if you modeled it this way, you would need to check the inputs.
This would account for a drop in savings, but not sure it would account for
everything. Also, I would expect an increase in pump energy use for the
WSHP system. In regards to the part load efficiency curves, I have not
studied WSHP and PTACs next to each other. You might want to make sure that
your curves are normalized to EERs you are inputting.
--
Karen
On Wed, Jul 9, 2008 at 4:55 PM, Tobias, Mike <mtobias at loringengineers.com>
wrote:
> Modeling a 30 story hotel with PTACs (9.54 EER) vs. WSHP (12 EER) I am
> expecting to see a large cooling energy reduction. Since the envelopes
> are the same I'm expecting to see the full 26% improvement, however I
> only see an 11% improvement in cooling energy comparing the BEPS report.
> I would expect part load performance to maintain an almost constant
> efficiency spread of 25% through the whole part load curve. But maybe
> for some unkown reason to me the efficiency spread decreases
> dramatically through part load? Also is there any way to check overall
> building cooling efficiency like divide overall cooling loads into
> energy? Cooling energy can be found on BEPS, but total building cooling
> load varies from LS-F and LS-D to SS-D.
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