Comparison of ASHRAE Standard 90.1, 189.1 and IECC Codes for Large Office Building in Texas), Energy Systems Laboratory, Texas A&M University.

Abstract

Six energy codes were compared in terms of site and source energy consumption. This comparison includes ASHRAE Standard 90.1-1989, ASHRAE Standard 90.1-1999, ASHRAE Standard 90.1-2007, ASHRAE Standard 90.1-2010, IECC 2009, IECC 2012 and ASHRAE Standard 189.1-2009. Analysis was performed for three Texas counties: Harris (Climate Zone 2A), Tarrant (Climate Zone 3A) and Potter (Climate Zone 4B). Both site and source energy consumption were compared. The source energy multipliers for electricity is 3.16 and for gas is 1.1 (IECC, 2009). ASHRAE Standard 90.1-1989 was considered as the base-case. When considering site energy consumption, ASHRAE Standard 90.1-1999 provides an improvement of 19.6% -21.1%. ASHRAE Standard 90.1-2004 provides an improvement of 25.5%-33.7%, ASHRAE Standard 90.1-2007 provides an improvement of 30.3%-35.0%, IECC 2009 provides an improvement of 30.0%-36.4%, IECC 2012 provides an improvement of 38.1%-41.0%, ASHRAE Standard 90.1-2010 provides an improvement of 43.1%-51.3% and ASHRAE Standard 189.1-2009 provides an improvement of 51.4%-57.0% above the ASHRAE Standard 90.1-1989 base-case. When considering source energy consumption, ASHRAE Standard 90.1-1999 provides an improvement of 18.6% -19.2%, ASHRAE Standard 90.1-2004 provides an improvement of 25.8%-29.2%, ASHRAE Standard 90.1-2007 provides an improvement of 27.0%-30.4%, IECC 2009 provides an improvement of 27.4%-32.5%, IECC 2012 provides an improvement of 31.9%-35.3%, ASHRAE Standard 90.1-2010 provides an improvement of 43.5%-50.4% and ASHRAE Standard 189.1-2009 provides an improvement of 50.2%-54.9% above the ASHRAE Standard 90.1-1989 base case.