Convert SEER to EER for eQUEST

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I am sure this question has been asked many times before in the onebuilding list but I wanted to have it answered here as well. When ASHRAE 90.1 or MNECB/CNEB ask for a performance rating for a cooling system in SEER, how does one convert this SEER value into an EER to be used in eQUEST?

I know equest uses some formula of conversion in the wizards however where does this formula come from? is it really applicable? I am interested in hearing some thoughts on this subject.

Thanks!

Jason

jng

asked 2014-12-09 10:33:04 -0500

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__AmirRoth__

updated 2015-11-10 15:20:23 -0500

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Two formulas that I've used in the past:

EER approximately equal to 0.9 * SEER
EER = -0.02SEER^2 + 1.12SEER

The first is just from general googling, and was a rough consensus value between several sources. The second is from the eQuest mailing list forums. Using a SEER of 10 gives you 9 from the first, and 9.2 from the second.

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Benjamin

answered 2014-12-09 11:05:49 -0500

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keb

updated 2014-12-09 11:47:07 -0500

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I believe the second equation can be found in TRANE hvac equipment literature. It is the one we typically use.

Anonymous (2014-12-09 11:39:40 -0500) edit

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Just noticed a 2013 paper from Texas A&M, METHODOLOGY FOR CALCULATING COOLING AND HEATING ENERGY-INPUT-RATIO (EIR) FROM THE RATED SEASONAL PERFORMANCE EFFICIENCY (SEER OR HSPF). That paper presents correlations to give you COP as a function of SEER. They report this correlation works better than earlier methods from FSEC and ASHRAE RP-1197.

Find it here: http://repository.tamu.edu/handle/196...

The paper is marked DRAFT. Perhaps one of the authors can report on status.

-Erik