[Equest-users] Purchased Chilled Water Pumps

[Jeff Ross-Bain]

Hi Bill,
And thanks for the quick response.

LEED V4 has added new requirements that reflect ASHRAE 90.1-2010. Previously LEED had Path 1 and Path 2 (per the document you referenced). Now, there is Path 1, 2, and 3, where Path 2, and 3, are the same as before, and Path 1 now refers to ASHRAE 90.1-2010 Appendix G and only applies to buildings where there is both purchased cooling and heating.
What I failed to mention is that we have both district cooling AND heating on this project.

So to reframe the question, per 90.1-2010, Appendix G, with purchased chilled water and heat, should the Baseline include a CHW pump even though the Proposed design does not have CHW pumps. 90.1-2010 language was a bit vague to me regarding that point.

Regards,

Jeff Ross-Bain, BCxP, BEMP, LEED Fellow, MSc
President
Charleston:  843-779-9229
Atlanta:  404-220-8955
RBGB<http://www.rbgb.com/>

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From: Bishop, Bill <bbishop at pathfinder-ea.com>
Sent: Wednesday, September 11, 2019 1:41 PM
To: Jeff Ross-Bain <jeff at rbgb.com>
Cc: equest-users at lists.onebuilding.org
Subject: RE: Purchased Chilled Water Pumps

Hi Jeff,
The USGBC provided a guidance document for district thermal energy systems that should be helpful to you. The latest version is now 9 years old, but if you are modeling to 2010 Appendix G, it should be useable.
https://www.usgbc.org/resources/des-district-energy-systems-guidance-v22-and-v2009-guidance-v20

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
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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Jeff Ross-Bain via Equest-users
Sent: Wednesday, September 11, 2019 1:23 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Purchased Chilled Water Pumps

Hi All,
I seem to get hung up on the basics.
Our project has purchased chilled water from a campus energy plant. The Proposed design does not have CHW pumps as the system is pressurized.
>From 90.1-2010, I am not sure if the Baseline model should include CHW pumps, or if they are omitted as in the Proposed.
Any thoughts would be helpful.
Many thanks!

Jeff Ross-Bain, BCxP, BEMP, LEED Fellow, MSc
President

[RBGB_Logo_Hi-Res]<http://www.rbgb.com/>

Charleston:  843-779-9229
Atlanta:  404-220-8955
www.rbgb.com<http://www.rbgb.com/>

Maximizing Building Performance

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