News Details
ASHRAE Publishes 2017 Version of Thermal Comfort Standard
03 February 2018

The 2017 edition of ASHRAE’s thermal comfort standard has been published to incorporate seven published addenda to the 2013 edition. ANSI/ASHRAE Standard 55-2017, Thermal Environmental Conditions for Human Occupancy, simplifies the language of the 2013 standard and clarifies the three comfort calculation approaches in Section 5.3.3. The 2017 edition includes a new requirement to calculate the change in occupants’ thermal comfort from direct solar radiation. The three comfort calculations methods provided in the 2017 edition are:
• a graphic method for simple situations,
• an analytical method for more general cases, and
• a method that uses elevated air speed to provide comfort.
Other additions include simplification of Appendix A to a single procedure for calculating operative temperature; clearly stated requirements and calculation procedures appearing sequentially; an update to the scope to ensure the standard is not used to override health, safety, critical process requirements, and removal of permissive language.

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