ASHRAE-90.1-2022- - Page 004
Extracted Content
(This foreword is not part of this standard. It is merely informative and does not contain requirements necessary for conformance to the standard. It has not been processed according to the ANSI require- ments for a standard and may contain material that has not been subject to public review or a consen- sus process. Unresolved objectors on informative material are not offered the right to appeal at ASHRAE or ANSI.)
FOREWORD
The 2022 edition of Standard 90.1 incorporates more than 80 addenda to the 2019 edition and includes numerous energy-saving measures. Notable changes include the following:
General
includes exceptions for small buildings, buildings with limited roof space, and other situations where PV installations would be problematic.
• It should be noted that, due to the addition of a new section and several appendices, the number or letter designations of several well-known sections and appendices have changed from those used in the 2019 and previous editions of the standard.
Administration and Enforcement
• There were no major changes to administration and enforcement.
• Requirements were added that address the impacts of thermal bridges in building envelopes, with a new Informative Appendix K providing supplemental information on application.
• A solar reflectance requirement for walls was added for Climate Zone 0. This is similar to the require- ments for high albedo roofs.
• Specific provisions were added to distinguish roof replacements from other types of alterations.
• A ne w reference was added for steel-framed walls to allow use of ANSI /AISI S250 for U-factor determi- nation.
• Added a definition for insulated metal panels (IMPs).
• Normative Appendix A was reformatted to clarify the requirements for thermal performance calculations.
Lighting and Power
• Reorganized Section 9, “Lighting,” to be more consistent with the structure of other main sections of the standard.
• Updated installed interior lighting power allowances and minimum control requirements; added a power exception for the germicidal function in luminaires and sources; and removed exceptions for casinos and parking garage daylight transition zone lighting.
• Modified a number of lighting requirements to reflect greater use of higher efficiency LED products and revised lighting practices.
• Added requirements for indoor horticultural lighting in greenhouses and indoor grow buildings based on a new metric, photosynthetic photon efficacy (PPE), developed in ANSI/ASABE S640.
• Provided an additional interior lighting power allowance for video conferencing. Power allowances and controls have been moved to a table for ease of reference.
2 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)
