New Ashrae standard eyes greener homes
01 April 2019
Ashrae has released an updated edition of the Ansi/Ashrae/IES Standard 90.2-2018 for energy-efficient design of low-rise residential buildings.
The standard establishes minimum whole-building energy performance requirements (design, construction, and verification) for energy-efficient residential buildings.
The 2018 revision of Standard 90.2 outlines cost-effective residential building energy performance measures that are at least 50 per cent more efficient than those defined by the 2006 International Energy Construction Code (IECC).
“Standard 90.2 provides a mechanism by which any residential building design can be easily evaluated against performance objectives,” says Theresa Weston, chair of the Standard 90.2 committee. “This update offers better alignment between this standard’s requirements and marketplace product availability as well as some revisions to improve the document’s clarity and internal consistency.”
The 2018 edition of Standard 90.2 provides clarification for modelling software requirements; guidance on the use of international climate data presented in Ashrae Standard 169; a new normative appendix on proper installation techniques for critical thermal resistance building components; and clarifications to multi-zonal building air-leakage testing procedures.
It also offers improved prescriptive envelope performance data tables; new performance specifications for ground-source heat pumps; guidance on pool heater pilot lights, pump motor efficiency, and exterior de-icing systems; and minimum lighting efficiency provisions for single-family, large single-family, and multifamily homes.
Founded in 1894, Ashrae is a global society with more than 56,000 members worldwide that focus on building systems, energy efficiency, indoor air quality, refrigeration and sustainability.
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