Operative temperature
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In the study of human thermal comfort, the operative temperature is one of several parameters devised to measure the air's cooling effect upon a human body. It is equal to the dry-bulb temperature at which a specified hypothetical environment would support the same heat loss from an unclothed, reclining human body as the actual environment. In the hypothetical environment, the wall and air temperatures are equal and the air movement is 7.6 centimeters per second. From experiment it has been found that the operative temperature
where tr is the mean radiant temperature; ta is the mean air temperature; ts is the mean skin temperature (all in degrees Celsius); and v is the airspeed in centimeters per second.
