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CI-2009 EAp2:Minimum Energy Performance

Using Heat Pump for Domestic Water Heating

M.S. Chan

BAI

LEEDuser Basic Member

0 thumbs up

October 19, 2012

We are using heat pumps for domestic water heating. (The water source will be from the campus/district condenser water system.) Can we take credit in the energy calculations using heat pumps? If so, how is this modeled?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 10/19/2012 - 19:50

Yes you can claim the energy savings. How you model it depends on your software.

M.S. Chan

BAI

LEEDuser Basic Member

0 thumbs up

Fri, 10/19/2012 - 19:53

We are using the Trace 700.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 10/19/2012 - 20:05

For more information on how to model it in Trace call them or post a question on the Trace user's Group at onebuilding.org

M.S. Chan

BAI

LEEDuser Basic Member

0 thumbs up

Mon, 10/22/2012 - 20:50

We are using appendix G for modeling in lieu of section 11. Manual (LEED-CI) says we can use appendix G with Table 2. Table 2 refers to Table 11.3.1 of Section 11 which says the budget building design and proposed building design service hot water systems are to be the same. This seems to contradict the response.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 10/23/2012 - 00:26

See above regarding source. For future posts - if you expect complete answers please provide complete questions.

M.S. Chan

BAI

LEEDuser Basic Member

0 thumbs up

Tue, 10/23/2012 - 00:06

Table 2 that I am referring to is from the LEED Reference Guide for Green Interior Design and Construction, EA Credit 1.3 (item 11 on page 171). The Table 11.3.1 is in Section 11 in ASHRAE 90.1-2007.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 10/23/2012 - 14:42

This forum is for EAp2 not EAc1.3. Appendix G is allowed under EAc1.3 but it is not allowed under EAp2 as far as I can tell. Keeping the hot water energy use the same under EAc1.3 makes sense since the purpose of that Appendix G model is to determine HVAC related savings only. Section 11 is used to demonstrate compliance and that is why it must be used for this prerequisite. It is the alternative used to demonstrate compliance if the project cannot meet all of the prescriptive requirements. The CI Reference Guide says on page 142 that systems within the project scope of work are eligible for trade off. Assuming the heat pumps you referred to are in the scope of work they are eligible for trade off or savings relative to this prerequisite.