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CS-2009 EAp2:Minimum Energy Performance

DHW percentages for retail

I am working on a model for a large retail space, and need to determine the hot water usage. Based on square footage, FTE and flow/flush rates, I can determine the total water usage (obviously that's WEp1). From that, how do I derive the hot water usage? Is there a standard percentage of hot water out of total water? Does this percentage change based on different space types (for example, I assume that due to showers, residential HW% would be much higher than retail or commercial)? Thanks to anyone who can help me with this.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 07/23/2014 - 20:35

One of the ASHRAE Handbooks contains information on the % hot water. There is a table on the Service Hot Water tab of the new Section 1.4 Tables that you can use to do the calculations for hot water usage.

Wed, 07/23/2014 - 20:42

Marcus, thanks for the quick reply. I just downloaded the Revised Section 1.4 Tables, dated Dec 2012--that's the most recent one I see there--and there's no DHW table...am I looking at the correct document? Also, which ASHRAE Handbook are you referring to? Thanks again!
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 07/23/2014 - 21:09

Here is the latest one I know of - http://www.usgbc.org/resources/eap2-section-14-tables-new-all-bdampc-projects-regardless-registration-date Within the Service Hot Water tab there is a table called Service Hot Water Fixtures. Within the notes in this table it indicates the ASHRAE Handbook where you can find the information you seek.

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