Energy-saving measures proposed for ASHRAE standard

Fourteen proposed addenda are open for public comment for ASHRAE Standard 90.1, "Energy Standard for Buildings Except Low-Rise Residential Buildings." The energy-saving measures are related to variable-air-volume and cooling towers.


Fourteen proposed addenda are open for public comment for ASHRAE Standard 90.1, “Energy Standard for Buildings Except Low-Rise Residential Buildings.” The energy-saving measures are related to variable-air-volume and cooling towers.

Changes would take effect in 2012, allowing air conditioning unit manufacturers time to redesign and test their units. Manufacturers currently are redesigning to meet the 2010 phase-out of certain refrigerants.

Proposed addenda open for review until Oct. 14 are:

  • Addendum h addresses any potential conflict between Standards 55, 62.1 and 90.1 and takes advantage of the energy savings potential of direct digital controls.

  • Addendum j updates mechanical test procedures and references.

  • Addendum n extends VAV fan requirements for large single zone units.

  • q modifies vestibule requirements for Climate Zone 4.


  • Addendum d modifies the requirements in both the lighting and envelope sections to better allow daylighting.

  • f expands the roof requirements to include cool roofs, which are shown by research to reduce the conduction loads through roofs into conditioned space.

  • g updates the building envelope criteria for metal buildings.

  • i applies a 4-zone lighting power density approach to exterior lighting requirements.

  • Addendum k revises Tables 6.8.1E and 7.8 to identify the specific sections of the referenced standards; updates to reflect Federal efficiency levels for residential water heaters; and adds a requirement for electric table top water heaters.

  • l adds minimum efficiency and certification requirements for both axial and centrifugal fan closed circuit cooling towers. In addition, a reference to the Cooling Technology Institute test standard for closed circuit cooling towers has been added.

  • m establishes, effective Jan. 1, 2010, an additional path of compliance for water-cooled chillers.

  • o adds requirements for low voltage dry-type transformers.

  • p provides the necessary pressure credits for laboratory exhaust systems that allow prescriptive compliance of systems serving fume hoods.

  • r changes informative Appendix G performance rating method into a normative appendix. Additionally, some language has been modified to make the appendix enforceable.

To read the addenda or to comment, visit here .

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