[Equest-users] 90.1-2013 IEER Efficiency Conversions

[Bishop, Bill]

Hi Paul,
There are both full-load (EER) and part-load (IEER) minimum efficiencies for baseline air-cooled packaged DX systems in 90.1-2013 (and -2010, -2016).
It is a straightforward process to calculate the eQUEST cooling EIR using the equations provided in G3.1.2.1 for full-load COPnfcooling. (EIR = 1/COP.)
To also simulate the part-load (IEER) performance, at least one of the default eQUEST/DOE-2 part-load performance curves will have to be modified. I am not aware of any developer effort to date to create performance curves to match specific IEERs but it would be welcomed. I could walk you through the process if you wanted to give it a try.
FYI – I believe the IEER values you reference below are for water-cooled condensers, not air-cooled.
Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>        www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
134 South Fitzhugh Street
Rochester, NY 14608               [cid:image005.png at 01D5C227.98360D90]         Ask me why Carbon Fee & Dividend may be right for you.

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Paul Diglio via Equest-users
Sent: Wednesday, January 1, 2020 5:55 PM
To: Equest-users <equest-users at lists.onebuilding.org>
Subject: [Equest-users] 90.1-2013 IEER Efficiency Conversions

Hi All,

90.1-2013 defines IEER instead of EER for large, air-cooled packaged DX systems.

When modeling a baseline system, is there any way to convert the IEER to EER?  I know IEER is calculated using 4 levels of equipment loads, but when working with the baseline, I don't have any actual equipment datasheets to consult.

My cooling systems are between 177 MBH and 1,482 MBH.  IEER's per 90.1 are between 11 and 13.7.

Thank you,


Paul Diglio
87 Fairmont Avenue
New Haven, CT 06513
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