Forum discussion
CS-2009 EAp2: Minimum Energy Performance
Hi,
ASHRAE 90.1, section 9 does not apply to lighting within dwelling unit as stated in 9.1.1 footnotes. Table 9.5.1 include LPD allowance for multifamily building. Is this LDP allowance apply to enitre multifamily high rise building area that exclude dwelling unit area?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 21, 2012 - 9:59 am
It applies to the whole building I think.
While dwelling unit lighting is not regulated as a prescriptive requirement it is included in tables 9.5.1 and 9.6.1.
Steven Er
11 thumbs up
September 24, 2012 - 2:00 am
Since LPD for dwelling unit is not regulated, i assume LPD allowance (from Table 9.5.1) for multifamily building applied to all other space (corridor, lobby, etc.) other than dwelling unit in a multifamily high rise building.
As energy modeling purpose, LPD for dwelling unit shall be identical in proposed and baseline case.
ASHREA 90.1, Table G3.1 6d) exception states "For multifamily dwelling unit...., assume identical lighting power for the proposed and baseline building designs in the simulations."
Appreciate if any idea.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 24, 2012 - 10:57 am
I do not think that assumption is correct. The LPD in 9.5.1 does include the whole building and must be applied to the whole building.
It is correct that the dwelling unit lighting is technically not regulated and therefore should be identical. You might look beyond 90.1 for guidance on this issue. There were some LEED Interpretations on this issue that you should look up to see if they may still apply. Not sure if the Reference Guide addresses the issue.
The Advanced Energy Modeling Guide for LEED does contain some guidance on this issue. Like any non-regulated load - if you want to claim savings it is up to you to establish the baseline and demonstrate savings against it.