Ashrae Journal - October 2008 - (Page 44) The Future of 90.1 By Mick Schwedler, P Member ASHRAE .E., S ome have said that ANSI/ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, describes “the worst building that may be built” from an energy-efficiency standpoint while still complying with energy code requirements. Despite this assessment, Standard 90.1 has been the benchmark for local and national codes because it defines minimum requirements. Here are some examples of how the standard has been implemented. • The 2006 International Energy Conservation Code® (IECC), developed by the International Code Council (ICC), directly references Standard 90.1 by stating, in Chapter 5: 501.1 Scope. The requirements contained in this chapter are applicable to commercial buildings, or portions of commercial buildings. These commercial buildings shall meet either the requirements of ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings Except for LowRise Residential Buildings, or the requirements contained in this chapter. • Chapter 6 specifically references Standard 90.1-2004. 44 ASHRAE Journal · Reference 90.1 directly; or · Adopt 90.1 indirectly through the IECC; or · Adopt 90.1 through NFPA 5000—Building Construction and Safety Code®. Use by Other Entities • The balance of Chapter 5 of the IECC covers envelope, mechanical systems, service water heating, electrical power and lighting, and allows a total building performance path. A number of the requirements in these sections are identical to those in Standard 90.1 and an additional number are similar. Some requirements in Standard 90.1 are not included in the IECC. A practitioner may follow either path and comply with the IECC. • NFPA 900: Building Energy Code, explicitly cites Standard 90.1 in Chapter 4, Technical Provision for All Buildings Except Low-Rise Residential Buildings. • Within the United States many jurisdictions: ashrae.org In addition to code adoption, the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED®) products reference Standard 90.1. For example: • LEED for New Construction (NC) Version 2.2 requires compliance with Standard 90.1-2004 as a prerequisite for any level of certification, and requires reducing energy cost by 14% to obtain two “Optimize Energy Efficiency” credits. • The first public comment version of LEED 2009 included a prerequisite of exceeding the energy efficiency of Standard 90.1-2007 by 10%. In both documents, “Optimize Energy Efficiency” credits may be earned by exceeding the requirements of the prerequiAbout the Author Mick Schwedler, P is chair of ASHRAE SSPC .E., 90.1. He is manager, applications engineering with Trane in La Crosse, Wis. October 2008 http://www.ashrae.org
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