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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

Per area or Per linear meter requirement?

Our project proposed to install facade lighting system. They will use a linear tube lamp and mount it to the facade. The lamp consumption is 3.5W per linear foot. But for the installation to be dynamic and noticable and for the buidling to be iconic at night time, they proposed to install numerous linear tube lamp to the facade, nearly covering the surface of the facade. According to the Table 9.4.5 of ASHRAE 90.1, the LPD requirement for building facade is 0.2 W/ft2 for each illuminated wall or surface or 5.0 W/linear foot of each illuminated wall or surface length. We have done power allowance calculations both for the Per Linear requirement and Per Area requirement and also calculated the total power consumption of the proposed lighting fixture. The results showed that the proposed facade lighting system complied with the Per Linear requirement however it exceeds the Per Area requirement. We are confused on which requirement should this type of installation must comply with? Any thoughts are highly appreciated. Thank you in advance.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 11/19/2012 - 16:40

The requirement says "or" so as long as you comply with either one you are OK.

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