[Equest-users] Cooling EIR
Paul Riemer
Paul.Riemer at dunhameng.com
Tue Feb 7 11:26:14 PST 2012
And on packaged air cooled equipment the cooling EIR represents the compressor and the condenser fan power.
Paul Riemer, PE, LEED AP BD+C
DUNHAM
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Hall, Brendan
Sent: Tuesday, February 07, 2012 1:20 PM
To: Daniel Kaler; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Cooling EIR
Dan,
Your sign is flipped on in the denominator. It should be (3.413-1 + 0.012167). I'm attaching a sheet that went around a while ago about converting from EER to EIR that goes into more detail. Hope that helps.
Brendan Hall, M.Sc., LEED AP BD+C
Engineer, Mechanical
karpinski
ENGINEERING
3135 Euclid Avenue
Cleveland, OH 44115
P 216.391.3700 x 3111
E bhall at karpinskieng.com<mailto:bhall at karpinskieng.com>
W www.karpinskieng.com<http://www.karpinskieng.com/>
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel Kaler
Sent: Tuesday, February 07, 2012 1:39 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Cooling EIR
Hi All,
I don't mean to ask questions back to back days here, but I ran into roadblock. I found an equation for the compressor EIR to be:
Cooing EIR=(1/EER-0.012167)/(1/3.413-0.012167)
Has anyone tried to derive this, or know of a document that has done so? I seem to be missing something in my derivation as follows:
* EER=Cooling Output (Btuh)/(Supply Fan Input (W) + Compressor Input (W))
* 1/EER=Supply Fan Input/Cooling Output + Compressor Input/Cooling Output
* Compressor Input/Cooling Output = 1/EER - Supply Fan Input/Cooling Output
At ARI condition supply fan is rated at 365W/CFM & 400CFM/Ton
So Supply Fan Input/Cooling Output = 0.146 kW/Ton or .012167 W/Btuh
* Compressor Input/Cooling Output = 1/EER - 0.012167
* Compressor Input/Cooling Output (Btu/Btu) = 3.413*(1/EER - 0.012167)
i.e.
EER=11
Compressor EIR = 3.413*(1/11 - 0.012167) = 0.2687 (should be 0.2580)
Is there something that I am missing?
Thank in advance,
Daniel Kaler
Energy Engineer, EIT
MEP ASSOCIATES
engineers | consultants | commissioning
MEP Associates, LLC | 2720 Arbor Court | Eau Claire, WI 54701
Phone: 715.832.5680 | Fax: 715.832.5668 |www.mepassociates.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120207/d59e5cff/attachment-0002.htm>
More information about the Equest-users
mailing list