[Equest-users] District Thermal Energy Savings

[Paul Riemer]

Matthew,
I agree that you are a district energy system but I do not think the v2 DES document as written adequately addresses your situation.  Central condenser loop implies to me that the compressors (or absorbers) are on your side of the boundary but the DES doc assumes they are on the district side of the boundary. I would suggest you write an interpretation of how you propose to model it with respect to their intent.  For option  1 you might look at the lake/well chiller or other ways to lock down the condenser water temp. Option 2 will be more complicated.  Pump energy could be fun too.
Also remember that the DES document affects other prerequisites and credits.
Good luck,

Paul Riemer, PE, LEED AP
DUNHAM

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cam Fitzgerald
Sent: Tuesday, May 03, 2011 11:12 AM
To: Arpan Bakshi; Anthony Hardman
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] District Thermal Energy Savings

Mathew,

Before you submit a CIR (now called LEED Interpretations - LEED 2009), you should be sure to review the revised DES modeling methodology (v2.0) that is available on the USGBC web site. I believe it addresses your situation and it definitely provides clearer guidance than the original document. You can access it using this link: http://www.usgbc.org/ShowFile.aspx?DocumentID=7671.

Hope this helps, if not you may be stuck with getting an interpretation. Have a great day!

Cam Fitzgerald

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Arpan Bakshi
Sent: Tuesday, May 03, 2011 11:53 AM
To: Anthony Hardman
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] District Thermal Energy Savings

Matthew, depending on the size of your building, your baseline may not have a CW loop, in which case the intent of being cost-neutral towards thermal energy not generated inside the LEED boundary is satisfied. Agree on the suggested CIR, however.



On Tue, May 3, 2011 at 11:48 AM, Anthony Hardman <Anthony at greenengineer.com<mailto:Anthony at greenengineer.com>> wrote:
The DES definition uses the terms "thermal energy" derived outside the LEED project boundary.  You could certainly make the case that your condenser loop fits this definition.  Might be worth submitting a CIR for clarification though.  Changing your baseline after the fact is never fun.

Anthony Hardman, PE
LEED AP BD&C
Building Performance Analyst

THE GREEN ENGINEER, LLP<http://www.greenengineer.com/>
Sustainable Design Consulting - Energy Modeling - LEED Project Management
50 Beharrell St
Concord, MA 01742
O: 978/610-2801<tel:978%2F610-2801>
C: 720/840-7862<tel:720%2F840-7862>



From: equest-users-bounces at lists.onebuilding.org<mailto: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 Matthew W. Higgins
Sent: Tuesday, May 03, 2011 9:27 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] District Thermal Energy Savings


Does anyone have experience with district thermal energy by means of a central condenser water loop? I'm trying to determine whether this type of application is subject to the LEED District Thermal Energy Guidelines, like purchased CHW and Steam, or if I can compare to a baseline system in Appendix G based on building type/size.

Thanks!
Matthew Higgins, CEM, HBDP, LEED-AP (BD+C)
Energy Engineer

Bridgers & Paxton Consulting Engineers, Inc.
4600-C Montgomery Blvd. NE
Albuquerque, NM  87109
505-883-4111<tel:505-883-4111>
505-888-1436<tel:505-888-1436>  Fax
mwhiggins at bpce.com<mailto:mwhiggins at bpce.com>

www.bpce.com<http://www.bpce.com>





_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG<mailto:EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG>



--



Arpan Bakshi  LEED AP BD+C

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110503/f7f79d6e/attachment-0002.htm>