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Prediction of workplace wet bulb global temperature
1College of Public Health, University of South Florida, Tampa, USA.
Applied Occupational and Environmental Hygiene
|August 24, 1999
Summary
Predicting heat stress using the wet bulb globe temperature (WBGT) is crucial. Both empirical and thermodynamic models effectively predict WBGT in industrial settings like aluminum smelters, with empirical models being simpler.
Area of Science:
- Environmental Science
- Occupational Health
Background:
- The wet bulb globe temperature (WBGT) is the standard for assessing heat stress.
- Variations in heat stress conditions across locations and times present practical challenges.
Purpose of the Study:
- To evaluate a thermodynamic model for WBGT prediction in a laboratory setting.
- To compare empirical and thermodynamic models for predicting WBGT in an aluminum smelter environment.
Main Methods:
- Laboratory validation of a thermodynamic model against experimental data.
- Application and comparison of empirical and thermodynamic models for WBGT prediction in an industrial aluminum smelter.
Main Results:
- The thermodynamic model showed no significant difference from experimental data in the lab.
- In the aluminum smelter, both models exhibited slight over-predictions but showed no practical difference.
- Empirical model: 0.5°C over-prediction (SD 3.0°C); Thermodynamic model: 0.7°C over-prediction (SD 2.8°C).
Conclusions:
- Both empirical and thermodynamic models are effective for predicting WBGT in industrial settings.
- The empirical method is computationally less intensive and conceptually simpler for practical applications.
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