In the performance path approach, a baseline Energy Cost Budget (ECB) is established, based on the building size and program. (through building energy simulation) that it uses less energy than a baseline building built to ASHRAE 90.1 specifications. Involves modeling the proposed building design and demonstrating Requires that all components of the building meet the minimum standards specified by ASHRAE 90.1. There are 2 methods of complying with ASHRAE 90.1: the prescriptive and performance paths. In addition, many states apply ASHRAE 90.1 to buildings being constructed or under renovation. Percent improvement over ASHRAE 90.1 is the basis for awarding energy points within the LEED rating system. That provides minimum requirements for energy efficient designsįor buildings except for low-rise residential buildings. ASHRAE 90.1 (Energy Standard for Buildings Except Low-Rise Residential Buildings) is a United States standard
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