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The second change is that the baseline design is now fixed at a stable level of performance set approximately equal to 90.1-2004. Using this new version of Appendix G to show compliance with ASHRAE Standard 90.1-2016, the proposed building design needs to have a performance cost index (PCI) less than targets shown in a new table based on building type and climate zone.
#ASHRAE 90.1 2016 MOBILISM CODE#
This change will prevent energy modelers from having to develop separate baseline building models for code compliance and beyond code programs. A recent modification ( Addendum bm) to Standard 90.1 makes two significant changes for the 2016 version that will be published in October of 2016.įirst, it allows Appendix G to be used as a third path for code compliance in addition to rating “beyond code” building performance. The recently expired federal energy efficiency tax incentive program required the use of Appendix G 2004 and ASHRAE Standard 189.1 and the IgCC reference Appendix G 2013.
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The Federal Energy Management Program (FEMP) requires use of either the 2010 version or the 2013 version of Appendix G depending on the date construction began. LEED Version 2009 references the 2007 version of the Appendix G while LEED Version 4 references the 2010 version. Sixteen states have codes that reference the 2007 version of the ECB method, fifteen states reference the 2010 ECB, and six states reference the 2013 ECB. Uses of the Performance Paths in ASHRAE Standard 90.1. Figure 1 shows various uses for different vintages of the two performance paths in Standard 90.1.īecause of this, a single project that needed to achieve code compliance, LEED certification, and a federal tax incentive would need three separate building models, leading to confusion and unnecessary expense.įigure 1. Because state energy codes and various beyond-code programs reference different versions of Standard 90.1, the landscape can get a little confusing. Instead, Appendix G has been used to rate the performance of buildings that exceed the requirements of Standard 90.1 for “beyond code” programs including USGBC’s LEED Rating System, ASHRAE’s Green Building Standard 189.1, and the International Green Construction Code (IgCC).Įach of the two performance paths in Standard 90.1 get updated every three years to keep up with prescriptive changes when a new version of the standard is released. While similar to ECB, Appendix G is more flexible than ECB but, up to now, has not been allowed for demonstrating compliance.
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In addition to the ECB method, Standard 90.1 includes a second simulation based performance approach, Appendix G, the Performance Rating Method.
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The performance path, known as the Energy Cost Budget (ECB) method, provides additional flexibility by allowing a designer to “trade-off” compliance by not meeting some prescriptive requirements if the impact on energy cost can be offset by exceeding other prescriptive requirements, as demonstrated through energy simulation modeling. The prescriptive path establishes criteria for energy-related characteristics of individual commercial building components such as minimum R-values of insulation, maximum lighting power allowance, occupancy sensor requirements for lighting control, and economizer requirements for HVAC systems. The standard includes two paths for compliance. Michael Rosenberg, Pacific Northwest National LaboratoryĪSHRAE Standard 90.1 is the model energy standard upon which most non-residential energy codes in the United States are based. A newly published document from ASHRAE and IES gives users of their energy efficiency standard immediate access to an optional third path for compliance in ASHRAE Standard 90.1, providing more flexibility for the industry.