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

[Brett Fero]

Peter,

If you replace with following to the Cooling EIR calculation in the middle of the page, the values will be correct for the AC EIR calculations.

Cooling EIR = ((1/EER)-0.012167)/((1/3.413)+0.012167)  (note the additional parenthesis in the numerator)
                EIR =  ((1/11)-0.012167)/((1/3.413)+0.012167) = 0.258
This equation is comparable to the EIR equation at the top of the page.

However, when given a SEER, I find a difference in the results.

EER = SEER x 0.778 + 1.4 = 13 x 0.778 + 1.4 = 11.514

EIR = ((1/11.514) - 0.012167)/((1/3.413)+0.012167) = 0.2447, not your Wizard value of 0.2507


Brett Fero, P.E., LEED AP
RobsonWoese Inc.
Salina Meadows Office Park
301 Plainfield Road, Suite 180
Syracuse, NY 13212
Phone:   315-445-2650
Fax:  315-445-0958
bfero at robsonwoese.com<mailto:bfero at robsonwoese.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Hillermann
Sent: Thursday, June 17, 2010 11:22 AM
To: 'Josh Greenfield'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] eQuest: SEER to EIR??

I have the same question as Josh. My value from the wizard is coming out different from the equation. Even when calculating EER to EIR.

Example:
Wizard = EER 11 = 0.258
Calculation = EER 11 =0 .31 (which actually is the default value in my model when I fire it up)

Wizard = EER 12.5 =0.2223
Calculation = EER 12.5 = 0.27

Wizard = SEER 13 = 0.2507
Calculation = SEER 13 = 0.296

However in my calculations there is a 0.05 difference from wizard to calculation. (Obviously missing something) Should I just use the wizard values and be done with it?

Thanks,

PETER HILLERMANN

peterh at westallarchitects.com<mailto:peterh at westallarchitects.com>

westall
architects
3404 pierce drive
chamblee, georgia 30341

o 770.458.4113
f  770.458.5352
c 678.898.2936

westallarchitects.com
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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>
[cid:image003.jpg at 01CB0E22.285C0FB0]
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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