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Environment Module > Climate - 6 of 12

Effective Temperature

"Effective temperature (ET) is a combination of temperature and humidity that is a measure or index of subjective comfort/thermal sensation. This index was first developed by Dr. C.D. Yaglou for the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) in 1923. In 1991, Gagge (et al) updated the work of Yaglou. The figure below is adapted from the ASHRA Fundamentals Handbooks. Red indicates the summer "comfort zone, while blue indicates the winter. Both zones assume the wearing clothing appropriate to the season. (Buell and Tarianto (2003) Keeping your cool in summer.)

Comfort Zones and Standard Effective Temperature (ET)
(Figure courtesy of Big Ass Fans Co., Louisville KY, from Buell and Tarianto (2003) Keeping your cool in summer, as adapted from ASHRAE Fundamentals Handbooks)


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