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

[Paul Riemer]

Remember a packaged cooling equipment EER is the ratio of cooling effect (Btu/hr) provided divided by the total (supply fan, compressor, condenser fans and controls) energy draw (W).
So to get from the packaged unit EER to DOE-2 cooling EIR value and the EIR curves you need to remove the fan energy at each point.  That AHRI standard that Bill mentioned addresses what the fan volume and static pressure (but not explicitly fan power) has to be at each of the four part load points.  Good luck.

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 Bishop, Bill
Sent: Thursday, October 03, 2013 8:58 AM
To: Bobby Almeida; Kathryn Kerns; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Question regarding DX-Cool-EIR-fPLR & IEER

You would need to evaluate/modify two separate curves to match the IEER. IEER is a function of part load and condenser temperature, holding return air temperature (EAT) constant. The COOL-EIR-FPLR curve is a function of the part load ratio only, not temperature. The COOL-EIR-FT curve is a function of EAT and condenser temperature (OAT or EWT).

The IEER formula and methodology are described in section 6.2 of AHRI 340/360-2007 with Addenda 1 and 2<http://www.ahrinet.org/App_Content/ahri/files/standards%20pdfs/ANSI%20standards%20pdfs/ANSI%20AHRI%20Standard%20340-360-2007%20with%20Addenda%201%20and%202.pdf>.

Regards,
Bill

William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114            F: (585) 325-6005
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bobby Almeida
Sent: Wednesday, October 02, 2013 8:42 PM
To: Kathryn Kerns; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Question regarding DX-Cool-EIR-fPLR

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 01CEC019.F62B95D0]
Project Engineer

[cid:image002.jpg at 01CEC019.F62B95D0]
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> [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<mailto: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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