[Equest-users] Wizard DX EER Correction

[Robby Oylear]

Sorry to dig up an old topic, but I have a question about the wizard that
was talked about a year ago.  As mentioned below, the wizard will change
the efficiency you input into the program, but I can not figure out what
the change is based on.  One would assume its taking into account the fan
power, but by changing the fan bhp entry in the wizard I see no change in
the EIR that is output by the wizard.  

 

Does anyone have any insight as to how the wizard reaches the resulting
EIR for DX units?

 

Robby Oylear

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

 <http://www.rushingco.com> www.rushingco.com

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Andrew
Craig
Sent: Wednesday, August 29, 2007 12:06 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] a qucik question about Cooling EIR -- eQuest

 

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, LEEDR 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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