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WBGT Equation (Indoor Approximation):
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Wet Bulb Globe Temperature (WBGT) is a composite temperature used to estimate the effect of temperature, humidity, wind speed, and solar radiation on humans. It's particularly useful for managing heat stress in occupational and athletic settings.
The calculator uses the indoor approximation formula:
Where:
Explanation: This simplified indoor approximation weights the wet bulb temperature more heavily (70%) as it better represents the effects of humidity on human heat stress, while the dry bulb temperature accounts for 30% of the calculation.
Details: WBGT is crucial for preventing heat-related illnesses in workplaces, athletic events, and military training. It helps establish guidelines for work/rest cycles, hydration requirements, and activity modifications in hot environments.
Tips: Enter both wet bulb and dry bulb temperatures in Celsius. Valid temperature ranges are from -50°C to 100°C. For outdoor conditions, more complex formulas incorporating globe temperature are recommended.
Q1: What's the difference between indoor and outdoor WBGT calculations?
A: Outdoor calculations include globe temperature to account for solar radiation, while indoor approximations typically use only wet and dry bulb temperatures.
Q2: What WBGT levels are considered dangerous?
A: Generally, WBGT above 28°C requires caution, above 30°C requires moderate protective measures, and above 32°C requires aggressive heat stress management.
Q3: How is wet bulb temperature measured?
A: Wet bulb temperature is measured with a thermometer whose bulb is covered with a water-saturated cloth and exposed to air flow.
Q4: Are there limitations to this simplified formula?
A: Yes, this indoor approximation doesn't account for solar radiation or wind effects, which are important for outdoor conditions.
Q5: How often should WBGT be monitored in workplace settings?
A: In hot environments, WBGT should be monitored at least hourly, or more frequently if conditions are changing rapidly.