ATLANTA, GA — Proposed revisions of “Thermal Environmental Conditions for Human Occupancy” (ASHRAE Standard 55-1992R) were approved for public review of its proposed revisions at the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Winter Meeting held here last month.

The standard includes environ-mental factors such as temperature, thermal radiation, humidity, and air speed; personal factors are activity and clothing.

According to Daniel Int-Hout, chair of the committee revising the standard, one major proposed change is the addition of the predicted mean vote (PMV) calculation method, which is used to assess thermal comfort.