[Equest-users] EIR to EER

[Mark Nieman]

Attached is a small paper describing the process to convert EER to EIR
that I received during an eQUEST training class.

 

As to the reports, SV-A lists EIR for DX equipment in the upper right.
Power demand for supply and return fans is also listed. Report SS-H
shows Heat pump compressor + condenser electric or electric reheat and
Unitary equipment compressor + condenser electric energy in the right
four columns. SS-P shows the monthly compressor energy use.

 

Mark Nieman, PE, CEM | McKinstry | Sr. Energy Engineer 
d 206.832.8152 | m 206.510.4760 | f 206.832.8552 
FOR THE LIFE OF YOUR BUILDING 

From: Arunabha Sau [mailto:runabha at gmail.com] 
Sent: Friday, June 24, 2011 4:23 PM
To: equest-users at lists.onebuilding.org; Mark Nieman; Nick Caton; Paul
Riemer
Subject: EIR to EER

 

Howdy all,

 

 

How to calculated EER? It's redundant, I know. There was several post
regarding this, but if anybody post some link to some valid document, it
would be highly appreciated.

 

For few posts, I've found (in blue texts) is here. Can you guys please
tell me how to find Condenser & Compressor Fan Watts from output report?
Please help.

~~~~~~~~~

From: Paul Riemer [mailto:Paul.Riemer at dunhameng.com
<http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org>
] I do not recall where I found this but obviously I attribute it to the
above

 
Sent: Wednesday, August 13, 2008 3:13 PM
To: 'Robby Oylear'; equest-users at lists.onebuilding.org
<http://lists.onebuilding.org/listinfo.cgi/equest-users-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)
 
 
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
 
~~~~~~~~~
Once again, I appreciate your help.
 
Much thanks,
Aru

 


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