![]() Lighting-reduced lighting power density a lower threshold for where daylight controls are required a new section on horticultural lighing an expanded scope to include lighting sites that may not have a buildingĪdditionally, when using the performance path, there is a new “envelope back-stop,” meaning the building envelope needs to account for a certain percentage of the energy savings, Sciarra explained.Mechanical systems-improved efficiency for variable-refrigerant-flow (VRF) systems, chillers, and service hot water systems.Envelope-prescriptive and performance requirements to account for and minimize thermal bridges mandatory air-leakage testing for small buildings the introduction of “cool walls”.Proposed changes in the three major sections include: ![]() ![]() “There’s a lot in version one that I feel is going to change the way that people design buildings,” said Sciarra, who chairs the building envelope subcommittee of the ASHRAE 90.1 development group. Proposed changes to the ASHRAE 90.1 standard for 2022 could have a huge impact on building energy performance, according to Leonard Sciarra, AIA, of Farr Associates. ASHRAE 90.1-2022 newly requires renewables for most projects.
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