[BLDG-SIM] a qucik question about Cooling EIR -- eQuest

[Andrew Craig]

Anna---

The EIR in eQUEST is the combined efficiency of the unit condenser and
compressor while the ASHRAE code EER or SEER values are the entire
packaged unit efficiency.  You'll notice if you enter a published EER or
SEER in the wizard and then check the EIR output in the detailed edit
mode, it does not equal 3.413/EER because it isn't taking into account
the fan efficiency or inefficiency depending on how you look at it.

If you are doing a model for LEED, the way I have been advised to model
packaged units is to enter the ASHRAE Table values in the wizard (EER or
SEER) and let the program parse out the components of EIR and fan power.
Then, calculate the baseline fan efficiency and enter that number in the
detailed edit mode, overriding the wizard created value.

I have heard from members on the ASHRAE committee that Appendix G does
not handle this issue very well and it seems to be something that could
be refined.  If anyone out there has a more definitive stance on the
proper way to model packaged units in eQUEST with regards to
ASHRAE/Appendix G, please chime in.

Regards,

Andrew Craig, EIT, LEED(r) AP | Mechanical Designer
INTERFACE ENGINEERING 
708 SW Third Avenue | Suite 400 | Portland, OR 97204 
direct: 503.382.2696
office: 503.382.2266
fax: 503.382.2262
email: Andrew_C at ieice.com
web: www.ieice.com 
Consultants of Choice to the Built Environment for over 35 years
Kirkland, WA | Portland, OR | Sacramento, CA | Salem, OR | SanFrancisco,
CA
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Anna Liu
Sent: Wednesday, August 29, 2007 11:38 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] a qucik question about Cooling EIR -- eQuest

Hello all, 

I have a quick question about the Cooling EIR in
eQuest. If I got COP from ASHRAE90.1-2004 Table 6.8.1,
then EIR=1/COP. Does this caculation include the
supply fan electrical energy already or not? 

Thanks for your help. 

Regards, 

Anna


       
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