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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Energy Model DHW peak flow vs WEp1 peak flow

Cory Duggin

Senior Energy Wizard

TLC Engineering Solutions

LEEDuser Premium Member

44 thumbs up

September 28, 2016

When claiming DHW savings due to low flow fixtures, i use the calculator in Table 1.4 to come up with my peak baseline and proposed DHW flows, which it says should use data from WEp1. If the project contains DHW flow fixtures outside of the scope of WEp1, such as pot filler sinks, should those be included in the calculation for the energy model peak flows? If they are included, then the energy model peak DHW flows won't be consistent with WEp1.

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 09/28/2016 - 22:15

The elements that are in WEp1 should be consistent with the elements that are in the hot water demand calculations for EAp2 (flow rates, total consumption, etc). You can include other hot water demand savings just make sure you provide some justification for your baseline assumptions. I know it does seem that LEED encourages foolish consistency but "A foolish consistency is the hobgoblin of little minds." Emerson :-)

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