What is the formula for indoor WBGT?

What is the formula for indoor WBGT?

• A. WBGT = 0.7WB + 0.3GT
• B. WBGT = 0.7WB + 0.2GT
• C. WBGT = 0.5WB + 0.5GT
• D. WBGT = 0.9WB + 0.1GT

Answer: (A)

Indoor WBGT combines how hot the air is with moisture effects (wet-bulb) and how much radiant heat is being absorbed by a spherical sensor (globe). In indoor settings, radiant heat is present but there isn’t the solar radiation outdoors, so the standard weighting uses 0.7 for the wet-bulb component and 0.3 for the globe component. That makes the formula WBGT = 0.7 × wet-bulb temperature + 0.3 × globe temperature. The weights sum to 1, reflecting a balanced measure of evaporative cooling and radiant heat indoors. The other options shift these weights or sum to less than 1, which misrepresents how indoor heat stress should be calculated.

Indoor WBGT combines how hot the air is with moisture effects (wet-bulb) and how much radiant heat is being absorbed by a spherical sensor (globe). In indoor settings, radiant heat is present but there isn’t the solar radiation outdoors, so the standard weighting uses 0.7 for the wet-bulb component and 0.3 for the globe component. That makes the formula WBGT = 0.7 × wet-bulb temperature + 0.3 × globe temperature. The weights sum to 1, reflecting a balanced measure of evaporative cooling and radiant heat indoors. The other options shift these weights or sum to less than 1, which misrepresents how indoor heat stress should be calculated.