[Equest-users] Question regarding DX-Cool-EIR-fPLR

[Bobby Almeida]

Hi Kathryn,

On our projects where we take credit for part load efficiencies we use addendum s to 90.1-2007. This adds in IEER values for units so you're comparing apples to apples. The only projects we have modeled this on have had baseline systems that were 9.5 EER with an IEER of 9.6. With such a small difference between EER and IEER, the 25%, 50% and 75% values aren't that important. 9.5 EER at full load and 9.6 at the other values will get you the 9.6 required for baseline. For information on how to make curves I would look through the archives of this user group, there have been some great explanations.

Bobby Almeida, E.I.T.  [cid:image001.jpg at 01CEBF94.B0308D40]
Project Engineer

[cid:image002.jpg at 01CEBF94.B0308D40]
4051 Glencoe Ave. Suite 5
Marina del Rey, CA 90292
p. 310.591.8172
c. 925.980.2025
www.gaiadevelopment.com<http://www.gaiadevelopment.com/>

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kathryn Kerns
Sent: Wednesday, October 02, 2013 3:37 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Question regarding DX-Cool-EIR-fPLR

Everyone, has anyone ever modified the standard DX-Cool-EIR-fPLR curve to fit a particular DX cooling system? If so, when you compared it to a baseline DX cooling system, did you use the original eQuest DX-Cool-EIR-fPLR?

I looked through ASHRAE 90.1 -2007 and although there is full load EER data for air conditioners and heat pumps, there is no IEER data.

However, it occurs to me that if ASHRAE 90.1 starts including IEER data (which shows up in ASHRAE 90.1 -2010 Section 6) how are we going to modify the eQuest DX-Cool-EIR-fPLR to accommodate the IEER? The IEER is a single number and we have no idea what the 25%, 50%, 75% cooling load ratios look like.

Hmmm.



Kathryn Kerns

Systems Specialist

BCE Engineers, Inc.

| Ph: 253.922.0446 | Fx: 253.922.0896 |


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