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NC-2009 EAp2:Minimum Energy Performance

DHW (Domestic Hot Water) as process load

It the project I'm modeling for LEED, the DHW is provided by several electric water heaters located in the the restroom zones. The modeling software is considering this as a stand alone base utility as it is not connecting to any plants. Should such DHW be considered as process load. Thanks.

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Profile picture for user Marais.Jean
Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Fri, 11/14/2014 - 09:29

Yes. ASHRAE calls this "Service" hot water...see the end of App. G. LEED generally allows you to take credit for energy savings due to water reduction in the WE credit for the amount of water DHW reduction as well if you document it properly, but please check me on that.

Fri, 11/14/2014 - 09:45

Thanks for the reply. If it could be considered as process load, should it be entered in table 1.4.4 in the Other Process Equipment table. Thanks also for the advice of water reduction, but I'm not involved in WE credit. Thanks.

Fri, 11/14/2014 - 13:23

Point 11 of Table G3.1 specifies how DHW shall be considered. If the system is part of the new project, see paragraph b. Regards
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 11/14/2014 - 14:50

Domestic or service hot water is a regulated component of 90.1, see chapter 7. Since it is regulated (addressed by the standard), it is not a process load. So it gets entered in the Service Water Heating tables (Table 1.4.5 in the new section 1.4 tables or Table 1.4.4. in the old section 1.4 tables). Projects can claim energy savings associated with reduced hot water demand from low flow fixtures.

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