[Equest-users] Cooling EIR

Hall, Brendan BHall at karpinskieng.com
Tue Feb 7 11:19:48 PST 2012


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
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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


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