[Equest-users] WSHP COP penalty

[Adam.Boyd at CH2M.com]

Rebecca, one sanity check on that number is that the increase in natural gas energy should be about equivalent to the electrical energy saved on the compressors for heating due to the increase COP. If there is a lot of simultaneous heating and cooling going on, the penalty might be even larger since your cooling units are rejecting less heat to the loop. That should give you an idea if something fishy is going on.

Adam

From: Nicholas Couture, LEED AP [mailto:ncouture at emtec-engineers.com]
Sent: Friday, April 30, 2010 6:48 AM
To: Shea, Rebecca; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] WSHP COP penalty

Rebecca,

If the COP is getting better as you mention 2.9 to 4.5, wouldn't you be saving heating electricity rather than getting a penalty?


Nick Couture, LEED AP
Mechanical Engineer

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________________________________
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Shea, Rebecca
Sent: Friday, April 30, 2010 9:19 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] WSHP COP penalty

We're replacing 125 WSHPs at a building that are about 15 years old.  The EER is going from about 8.5 to 15, and the COP is going from 2.9 to 4.5.  I would expect electric savings and a slight heating penalty for the increase in COP, but I'm getting -20% heating penalty.  Any help is appreciated...

-Beka
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