[Equest-users] eQuest: SEER to EIR??

[Demba Ndiaye]

I also tried it some weeks ago, and could not get it match the Wizard Value. Maybe someone from the development team might help.

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Demba NDIAYE

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Josh Greenfield
Sent: Tuesday, June 15, 2010 4:02 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest: SEER to EIR??

Sorry to be beating a dead horse...

the attached document has been floating around the boards for awhile in regards to how an entered EER value in the Wizard gets converted to the Cooling-EIR value in the Detailed Edit mode, and after doing a few EER value tests, I can confirm it works...

I've also found in various emails the conversions on the heat pump heating side of COP and HSPF to Heating-EIR, and those work too after testing various values in the Wizard...
Heating EIR = (1/(COP*3.413)-0.012167)/((1/3.413)-0.012167)
Heating EIR = (1/((HSPF*0.28+1.13)*3.413)-0.012167)/((1/3.413)-0.012167)

But I just can't get the SEER to EER conversion from the document (EER = SEER x 0.778 + 1.4) to work.  I'm assuming that the converted SEER to EER value then gets put into the working equation from that PDF of Cooling-EIR = ((1/EER)-0.12167)/((1/3.413)+0.012167)).

As an example...if you put in a 13 SEER into the Wizard, a 0.2507 Cooling-EIR value is calculated in the Detailed Edit mode, but if you use the SEER to EER (13 SEER would equal a 11.514 EER) and then the EER to EIR equations, it says EIR should be 0.2447.

Any help/suggestions would be great...hopefully it's just a math error on my part.

Josh Greenfield, PE, REP, LEED AP
Energy Services Manager
Associate Vice President
312.242.6392 Direct
jgreenfield at primerachicago.com<blocked::mailto:jgreenfield at primerachicago.com>
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Primera Engineers, Ltd.
100 S. Wacker Drive, Suite 700
Chicago, IL 60606
312.606.0910 Main
312.606.0415 Fax
http://www.primerachicago.com

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