The goal of heating a space effectively is to maintain the Operative Temperature (To). Defined in ANSI/ASHRAE 55, Operative Tempera-ture is how warm a space feels versus its actual temperature. Because radiant energy heats the surfaces directly, the average MRT of the space tends to be higher than the Ambient Air Temperature (Ta).
The formula below describes the relationship between To, MRT, and Ta when air movement across occupant level is less than 40 feet per minute.
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