Twenty-three addenda to ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, are now open for public comment until October 4, 2015.
Among the addenda open for public comment is addendum ch, which proposes a new set of interior lighting power densities (LPD) limits for both building area and space by space compliance paths. The LPD limits are calculated using IES formulas that relate lighting energy use to lighting quantity based on the application of appropriate lighting technologies into individual space models. These models incorporate efficient cost-effective lighting technology, appropriate light loss factors, and current design practice that incorporate quality design elements. Specifically, the new LPD limits stem from inclusion of LED technology into the space type models that are used to determine appropriate LPD limits for compliance with the standard.
The new LPD values are generally lower by sometimes small to often significant amounts. The magnitude of the change is based primarily on the amount of LED technology incorporated into the model.
“These proposed changes have been under consideration within the 90.1 Lighting Subcommittee for several years,” Richman said. “Inclusion of LEDs were seriously considered for the 2013 version of the standard. However, at the time the changes needed to be processed (late 2012), the cost of LEDs was still relatively high and the variety and depth of available products was not deemed sufficient to incorporate into a mandatory code. We understand that LED technology continues to improve and become even more cost-effective such that by the time these new requirements are required for building projects, their effectiveness and viability on code compliance will be even easier.”
Additional proposed lighting-related changes include:
• bw, which provides a baseline for lighting controls consistent with addendum bm.
• cc, which replaces the definition of sidelighting effective aperture that was inadvertently deleted in 90.1-2013.
• cg, which modifies the exterior LPD for building exteriors.
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