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.
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5921 thumbs up
July 23, 2014 - 4:35 pm
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.
Alfonzo Collins
7 thumbs up
July 23, 2014 - 4:42 pm
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!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5921 thumbs up
July 23, 2014 - 5:09 pm
Here is the latest one I know of - http://www.usgbc.org/resources/eap2-section-14-tables-new-all-bdampc-pro...
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.