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?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 15, 2014 - 10:24 am
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.