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In the performance approach, a baseline energy cost budget ( ECB) is established, based on the building size and program.
ASHRAE 90.1 PDF 2013 CODE
For code compliance there is Chapter 11, which compares an energy model for your building to an energy model for a barely compliant building with the same HVAC system and in the 2016 edition an Appendix G path was added that compares an energy model of your building against a baseline model based on the 2004 edition of Standard 90.1 and requires lower energy consumption that varies depending on the building type. Performance path: A proposed building design is demonstrated (through building performance simulation) to use less energy than a baseline building built to ASHRAE 90.1 specifications.Prescriptive path: All components of the building meet the minimum standards specified by ASHRAE 90.1.In general, there are two means, or paths for building designers to comply with ASHRAE 90.1: 2 Status as an energy code and industry standard.
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Looking for more technical guidance? Try ASHRAE Technology Portal. It includes measurements and calculations in both I-P and SI units, sample calculations, application examples, forms to demonstrate compliance, and references to helpful resources and websites. The 90.1 User's Manual provides detailed instruction for design of commercial and high-rise residential buildings to ensure compliance with ANSI/ASHRAE/IES Standard 90.1-2016. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems. This standard offers detailed minimum energy efficiency requirements for design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. It provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. Standard 90.1 is used globally as a benchmark to set MEPS (minimum energy performance standards) and energy codes.