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

[Peter Hillermann]

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

 

westall

architects

3404 pierce drive

chamblee, georgia 30341

 

o 770.458.4113

f  770.458.5352

c 678.898.2936

 

westallarchitects.com

e-signatureUSGBC-Logo

 

 

 

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
 <blocked::mailto:jgreenfield at primerachicago.com>
jgreenfield at primerachicago.com

Logo-CMYK-Resume
Primera Engineers, Ltd.
100 S. Wacker Drive, Suite 700
Chicago, IL 60606
312.606.0910 Main
312.606.0415 Fax
 <http://www.primerachicago.com> http://www.primerachicago.com

 

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