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Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Interior Lighting Power Requirement in ASHRAE 90.1-2007

Sandra Holmström

environmental consultant

Bengt Dahlgren AB

LEEDuser Basic Member

1 thumbs up

August 15, 2014

I am wondering whether EAp2 requires a project to fulfill the Interior Lighting Power Allowances in Section 9.5 in ASHRAE 90.1-2007 if Option 1 - Energy Modeling is used? The prerequisite language only states that Mandatory Provisions (Section 5.4, 6.4, 7.4, 8.4, 9.4 and 10.4) in 90.1-2007 has to be fulfilled. The Building Area Method and Space-by-Space Method is described under section 9.2.2 as well as 9.5 and 9.6. I understand that either method has to be used in the energy modeling, but is it allowed to e.g. install 12 W/m2 in an office building and in the energy model take a minor penalty due to higher electricity usage in the Proposed model compared to the Baseline model (11 W/m2), as long as the 10 % overall efficiency is achived?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 08/15/2014 - 14:24

Yes. Since the interior lighting power density is not a mandatory provision it is available for tradeoff. You can go over the lighting energy use as long as you make up the savings elsewhere and get to the minimum percentage.

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