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Lighting the Path to Energy Efficiency: Changes Proposed for Standard 90.1



Nine addenda are proposed to ANSI/ASHRAE/IESNA Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings. The addenda are currently open for public review.


Nine addenda are proposed to ANSI/ASHRAE/IESNA Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings. The addenda are currently open for public review.

Proposed addenda would establish revised lighting power densities for both whole-building and space-by-space compliance methods. The addenda would reduce lighting power allowances in many building and space types while maintaining industry recommended lighting levels as their basis.

Additional proposed daylighting control requirements will also encourage the incorporation of effective daylighting and corresponding electric lighting control into designs, says Eric Richman, chair of the 90.1 lighting subcommittee.

Changes also are being proposed to the envelope section, including addendum f, which sets requirements for high albedo roofs. This proposal recognizes a number of roof construction strategies that result in reduced buildings loads, says ASHRAE.

Other proposed changes to the envelope section are addenda cl and cm, both of which address glazing products. Addendum cl would clarify how to interpret the use of dynamic glazing products that are designed to vary a performance property vs. a single
value. As the ratings for these products give a range of performance values, designers and code officials require an interpretation on what to use for compliance with the standard.  Addendum cm clarifies how to interpret the use of dynamic glazing products given the requirements in proposed addendum bb, which would update building envelope requirements for opaque elements, such as walls and roofs and fenestration.

In the mechanical section of the standard, a proposed addendum, ck, expands the zone control demand control ventilation to include system level strategies to reduce ventilation during system operation.

The remaining addenda - cg, ch, ci and cj - would make modeling defined by Section 11 and Appendix G of the standard consistent with other addenda that have modified Sections 6-9. These modifications include daylighting, dual minimum controls, cooling
towers and data centers.


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  posted on 2/11/2010   Article Use Policy

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