The second change is that the baseline design is now fixed at a certain level of performance, the stringency of which is expected not to change with subsequent versions of the standard. Using this new version of Appendix G to show compliance with the 2016 version of the standard, the proposed building design needs to have a Performance Cost Index (PCI) less than that shown in Table 4.2.1.1 based on building type and climate zone. “Now the standard provides that compliance path and gives credit for integrated design resulting in energy savings such as efficient use of building mass, optimized building orientation, efficient HVACR system selection, and right sizing of HVACR equipment.” “Previously Appendix G was used only to rate ‘beyond code’ performance of buildings but could not be used to demonstrate compliance with the base 90.1 standard,” he said.
This release also gives advanced notice to software developers that may be interested in automating the process of creating the Appendix G baseline.”Įrbe notes that the guidance in addendum bm had two significant impacts on Appendix G. Several entities have expressed interest in developing programs based on the revised appendix. “This is the first time ASHRAE and IES have made available an interim clean publication of a portion of Standard 90.1, and we are doing so now because users have expressed a critical need for this guidance. “This document is being provided at the request of users,” said Drake Erbe, chair of the Standard 90.1 committee.