[Equest-users] EIR to EER

[Arunabha Sau]

Howdy all,


How to calculated EER? It's redundant, I know. There was several post
regarding this, but if anybody post some link to some valid document, it
would be highly appreciated.

For few posts, I've found (in blue texts) is here. Can you guys please tell
me how to find Condenser & Compressor Fan Watts from output report? Please
help.
~~~~~~~~~
From: Paul Riemer [mailto:Paul.Riemer at
dunhameng.com<http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org>]
I do not recall where I found this but obviously I attribute it to the above

Sent: Wednesday, August 13, 2008 3:13 PM
To: 'Robby Oylear'; equest-users at lists.onebuilding.org
<http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org>
Subject: RE: [Equest-users] Wizard DX EER Correction



I thought Andrew said this mostly well but maybe equations would help.



EER = (Cooling Output Btu/hr ) / (Supply Fan W + Compressor W + Condenser
Fan W)



COP = Output / Input and is unitless



EIR = 1/COP (so it is also unitless) = (Compressor Input + Condenser Input)
/ (Cooling Output)



So hopefully you see that EIR does not include supply fan energy.  All fan
energy is modeled in DOE-2 based on the separate fan energy inputs and
assumptions.  Of course ASHRAE 90.1-2004 Section 6 and Appendix G including
amendments prescribe baseline fan power limits and part load performance.



I believe the Standard Test Procedure for determining the EER rating
includes a prescribed external static pressure but exactly what portion of
the total unit electric energy is due to the supply fan would vary a little
from unit to unit based on type of fan, internal static losses, etc.



So the eQUEST WIZARD is removing an assumed standard fan component from the
entered EER and doing a units conversion to determine a cooling efficiency
(EIR) for DOE-2.



I have in my files:



EIR =  (1/EER-0.012167)/((1/3.413)+ 0.012167)

EIR =  (1/SEER*0.778+1.4)-0.012167)/((1/3.413)+ 0.012167)

 eQUEST development team. I do apologize if it is out of date,
misinterpreted, or mistyped.



I encourage digging deep through the program, its help files, and the
various archives and also attending a training session like the Energy
Center of Wisconsin's with Marlin Addison.



Paul Riemer


~~~~~~~~~

Once again, I appreciate your help.

Much thanks,

Aru
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