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Heat Index (WBGT: Wet Bulb Globe Temperature)

Author: darknExecutions: 14848
TOP/Shared Formulas (Life)/Environment

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WBGT (Wet-Bulb Globe Temperature) is an index that incorporates three factors—humidity, radiant heat, and air temperature—which significantly affect the human body’s heat balance. It is calculated using the values of dry-bulb temperature, wet-bulb temperature, and black-bulb temperature.

* How to Calculate WBGT (Wet-Bulb Globe Temperature)

* Outdoors: WBGT = 0.7 × wet-bulb temperature + 0.2 × black-bulb temperature + 0.1 × dry-bulb temperature
* Indoors: WBGT = 0.7 × wet-bulb temperature + 0.3 × black-bulb temperature
Wet-bulb temperature　　
℃
Blackbody temperature　　
℃
Dry-bulb temperature　　
℃
Outdoor Heat Coefficient　　 ℃
Indoor Heat Coefficient　　 ℃
In the workplace, WBGT is a useful indicator, having been standardized as JIS Z 8504, “Evaluation of Workers’ Heat Stress Based on the WBGT (Wet-Bulb Globe Temperature) Index—Hot Environments,” and globally as ISO 7243. It is also an indicator used in physical activity, as evidenced by the “Exercise Guidelines for Heat Stroke Prevention” compiled by the Japan Sports Association.
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