[Equest-users] Hot water use (gal/person/day) in residencesin eQuest 3.65

[Nathan Miller via Equest-users]

Also an anecdotal follow up:

The ESMFRH guidelines assume that low-income housing developments will use more domestic hot water:
[cid:image002.png at 01D19EE7.01923C90]

However, on a SINGLE (emphasize single)  housing authority project I worked on, where we had a contract to follow up/calibrate our energy model 1 year after construction, we had real metered water data and found out that the occupants were actually using only about 12.5 gal/occ/day. They had low-flow fixtures plumbing fixtures, but it still was about half of the value we estimated at the time of modeling.

Take from that what you will…

Nathan Miller, PE, LEED AP BD+C – Mechanical Engineer/Senior Energy Analyst
RUSHING | D 206-788-4577 | O 206-285-7100
www.rushingco.com<http://www.rushingco.com/>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of via Equest-users
Sent: Monday, April 25, 2016 11:26 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Hot water use (gal/person/day) in residencesin eQuest 3.65

I did some “Handbook refreshing” in response to this discussion thread and that is indeed the current case (2015 Applications, page 50.15, Table 6 footnote).  The ESMFHR guidelines are a very good resource for multifamily/residential scenarios & a model I’d recommend reviewing for other cases as well.

If however you’re dealing with service hot water consumption cases falling outside of typical residential/multifamily context, I might be inclined to fall back on Applications’ suggested baseline gal/day/person DHW consumption guidance for other building occupancy types.  If carrying this into an energy model, I might also consider either using the hourly flow profiles (Fig 24, a few pages following), and/or the ASHRAE “standardized” fractional schedules for various building occupancy types featured in 90.1-1989 & carried forward into a bazillion other energy standards/references.

~Nick


------------------------------------------------------------------------------------------------------------------------------
Nick Caton, P.E.
  Senior Energy Engineer
  Energy and Sustainability Services
  North America Operations
  Schneider Electric

D  913.564.6361
M  785.410.3317
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>
F  913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image001.png at 01D189AB.58634A10]



From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Anthony via Equest-users
Sent: Monday, April 25, 2016 10:12 AM
To: 'José Luis Bermúdez Alcocer'
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Hot water use (gal/person/day) in residencesin eQuest 3.65

Last I checked, usage information in the ASHRAE handbooks “predates modern low flow fixtures.”  Energy star’s<https://www.energystar.gov/index.cfm?c=bldrs_lenders_raters.nh_mfhr_guidance> performance path calculator<https://www.energystar.gov/ia/partners/bldrs_lenders_raters/downloads/mfhr/ENERGY%20STAR%20MFHR%20Performance%20Path%20Calculator_V1.5_BLANK.xls?29c8-093e> is a better reference for this sort of thing.

Anthony Hardman, PE, BEAP, LEED AP BD+C
Senior Building Performance Analyst
The Green Engineer, Inc.<http://www.greenengineer.com/>
Sustainable Design Consulting
54 Junction Square Dr.
Concord, MA 01742
O: (978) 369-8978
D: (978) 610-2801
C: (720) 840-7862

The Green Engineer, Inc. is a Certified B Corporation

From: José Luis Bermúdez Alcocer via Equest-users [mailto:equest-users at lists.onebuilding.org]
Sent: Sunday, April 24, 2016 11:31 AM
To: Equest-users
Subject: [Equest-users] Hot water use (gal/person/day) in residences in eQuest 3.65

To whom it may concern:

What is the hot water use (gal/person/day) in residences according to the ASHRAE manuals?  Any comments will be highly appreciated!

Kind regards,

Jose Luis Bermudez Alcocer, Ph.D., M.Arch., B.Arch.

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