# [Equest-users] Wizard DX EER Correction

Mike Karpman mike.karpman at karpmanconsulting.net
Thu Aug 14 06:07:19 PDT 2008

```Attached is a reference on converting EER and SEER to Cooling EIR.

Hope this helps,

Mike

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Robby
Oylear
Sent: Wednesday, August 13, 2008 7:56 PM
To: 'Paul Riemer'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Wizard DX EER Correction

Thanks Paul,

We actually have that equation floating around the office and I wasn't sure
where it came from either.  Does anyone out there know where it comes from?

By the way, it is a little misleading to say that EIR does not include
supply fan energy.  If you have convert an EER or COP from a manufacturer to
an EIR without using something to remove fan heat, then it will have fan
energy.

I was hoping to use the wizard interface to remove the fan energy from an
ARI rated EER and was wondering if it was possible that anyone knew exactly
what was going on in the background.  The equation you gave doesn't quite
match the adjusted EER that the wizard gives out.

Robby Oylear

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

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

_____

From: Paul Riemer [mailto:Paul.Riemer at dunhameng.com]
Sent: Wednesday, August 13, 2008 3:13 PM
To: 'Robby Oylear'; equest-users at lists.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)

I do not recall where I found this but obviously I attribute it to the above
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

_____

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Robby
Oylear
Sent: Wednesday, August 13, 2008 1:19 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Wizard DX EER Correction

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

www.rushingco.com
<http://console.mxlogic.com/redir/?2OVtNCZSjqrXXRTDD3o0abt2sE4rlVsTvHECzBAQs
K8FzC3tPvyPvQCnrFYq5O5mUm-wafBiteH3O3szQ9g8Y01dFLELc6QkQnD7QnSnzr9EVdCBIq5C_
FcKTjUQdbFEw0mgFIk3h070cq81Eq1pEw4GNzZFOH0TfM-u0USyrjdFLLLnuuudYFek>

_____

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?

Regards,

Anna

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