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

[Kelsey VanTassel]

>From the eQUEST help file:

COOLING-EIR
The Electric Input Ratio (EIR), or 1/(Coefficient of Performance), for the cooling unit at ARI rated conditions. The program defines EIR to be the ratio of the electric energy input  to the rated capacity, when both the energy input and rated capacity are expressed in the same units. This EIR is at ARI rated conditions, i.e., without correction for different temperature or part load.
Note:  If you include fan electric energy consumption in your value of COOLING-EIR, then you should set SUPPLY-KW/FLOW to zero (and SUPPLY-STATIC, SUPPLY-EFF and SUPPLY-DELTA-T should be omitted). Otherwise, the supply fan electrical energy will be double counted. For commercial systems the default value of COOLING-EIR includes compressor and outdoor fan energy, but not indoor fan energy. Imbedding the fan energy into the COOLING-EIR is valid only if the fan is constant volume and INDOOR-FAN-MODE = INTERMITTENT; i.e. the fan cycles on/off with the compressor.  If the fan runs continuously during occupied hours, or the fan is variable volume, then the fan energy cannot be included in the COOLING-EIR (or HEATING-EIR).

Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>
608.836.4488 ext. 20 | Fax: 608.836.4477

Sustainable Engineering Group
901 Deming Way, Suite 201
Madison, WI 53717
www.sustaineng.com<http://www.sustaineng.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 10:22 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 01CB0E08.35EDB850]
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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