[BLDG-SIM] ASHRAE 90.1-2004 Appendix G: Credit for Low Flow Water Devices?

[Gaurav Mehta]

Kendra,

Yes, one can take credit for low flow fixtures that reduce the gpm for 
domestic hot water. This issue has been addressed in the Addendum to ASHRAE 
Standard 90.1-2004, Section G4.3. You can download the addenda supplement 
package from:

 http://www.ashrae.org/technology/page/132

Sometime ago, USGBC accepted the use of Addendums to 90.1, so this would be 
acceptable.

For baseline gpm, see Section 7.2 of 90.1, which further refers the ASHRAE 
Handbook- HVAC Applications for load calculations.


Best regards,

Gaurav Mehta

Sustainable Building Analyst,
Stantec



----- Original Message ----- 
From: "Tupper, Kendra" <Kendra.Tupper at sf.fk.com>
To: <BLDG-SIM at gard.com>
Sent: Wednesday, September 19, 2007 18:24
Subject: [BLDG-SIM] ASHRAE 90.1-2004 Appendix G: Credit for Low Flow Water 
Devices?


Quick question on the LEED Energy model based on ASHRAE 90.1-2004
Appendix G.

In Table G3.1 of ASHRAE 90.1-2004, the section on Schedules (#4) states
that the schedules for the baseline and Proposed buildings may differ to
model non-standard energy efficiency measures such as "measures that
reduce service water heating loads."  Does this mean that we can take
credit for low flow water devices that reduce the gpm consumed for
domestic hot water?

This gpm is never regulated in the standard, but a baseline is
calculated for the LEED Water Efficiency credit.  It seems as though you
should be able to take credit for pumping/heating energy savings from
reducing the gallons of domestic hot water consumed per year.  If so,
what do you use as your "baseline" gpm?

Thank you!

Kendra Tupper
LEED(r) AP
FLACK + KURTZ
405 Howard St. San Francisco, CA 94105
Direct          (415) 402-5840
Email   kendra.tupper at sf.fk.com



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