Currently open for a fourth public review, proposed Standard 189.1, Standard for the Design of High Performance, Green Buildings Except Low-Rise Residential Buildings is being developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) alongside the Illuminating Engineering Society (IES) and the U.S. Green Building Council (USGBC) and is expected to be published in early 2010. The proposed standard would be a total building sustainability package, addressing everything from design and commissioning to plans for high-performance operation.
“This is one of the most highly-anticipated building standards ever released,” says ASHRAE President Gordon Holness. “ASHRAE’s commitment to excellence and transparency in true consensus standards development is reflected in the quality of and interest in Standard 189.1.”
The proposed standard currently is in an “independent substantive change” review, so only changes from the third public review, which ended in June 2009, are open for comment. The public comment period started Sept. 18, and remains open until Nov. 2.
The biggest proposed changes to the standard is the exterior light pollution section, which includes the elimination of the Total Site Lumen approach. The draft of the standard that went out for a third public review earlier in the year required users to limit exterior lighting according to one of three methods for determining total initial lamp lumens, or light output, for all outdoor lighting, which complicates application and enforcement significantly.
The current draft maintains the use of Backlight, Uplight, and Glare ratings from the IES Luminaire Classification System for Outdoor Luminaires (IESNA TM-15-07), and modifies the exterior lighting power densities and lighting zone definitions to align with recent ASHRAE 90.1 addenda.
Another proposed change is in the Outdoor Air Delivery Monitoring section, which requires the measurement of outdoor airflow rates at the system level for all spaces ventilated by mechanical systems, except for constant volume systems. The exception allowing CO2 monitoring as an alternative for systems serving only densely occupied spaces has been removed. Additionally, the removal of all requirements for outdoor airflow monitoring in naturally ventilated spaces has been proposed.
The standard development committee will meet again during the USGBC GreenBuild conference in November to review comments received during this “independent substantive change” public review.
To view a copy of the public review draft, go to www.ashrae.org/publicreviews. Copies of public review drafts are only available during public review periods.