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Should electric fans be used during a heat wave?
Ollie Jay1, Matthew N Cramer2, Nicholas M Ravanelli2
1Thermal Ergonomics Laboratory, Exercise and Sport Science, Faculty of Health Sciences, University of Sydney, 75 East Street, Lidcombe, NSW 2141, Australia; School of Human Kinetics, University of Ottawa, K1N 6N5, Canada.
Electric fans offer a cost-effective way to combat heat waves, improving critical environmental limits for heat balance and reducing cardiovascular strain. Their use is advisable even in severe heat, contrary to some public health warnings.
Area of Science:
- Environmental Health
- Human Physiology
- Thermal Comfort
Background:
- Heat waves pose significant mortality risks, particularly for vulnerable populations like the elderly.
- Public health agencies often caution against electric fan use during heat waves, despite a lack of evidence against their efficacy.
- Electric fans are a simple, cost-effective intervention for heat wave mitigation.
Purpose of the Study:
- To evaluate the efficacy of electric fans in improving human heat balance during heat waves.
- To determine the impact of fan use on critical environmental limits for physiological compensation and cardiovascular strain.
- To assess potential risks of dehydration associated with fan use under extreme heat conditions.
Main Methods:
- Utilized a conceptual human heat balance model.
- Estimated evaporative requirement for heat balance.
- Calculated potential for evaporative heat loss and predicted sweat rates with and without electric fans.
Main Results:
- Electric fans increase critical environmental limits for heat balance and cardiovascular strain by approximately 3-4 °C, irrespective of relative humidity.
- Fans provide marginal benefits even at extreme temperatures (e.g., 51.1 °C at 10% RH for young adults).
- Dehydration risk is minimal, with only a slight increase in predicted sweat loss (20-30 mL/h) under very hot and dry conditions (>40 °C, <10% RH).
Conclusions:
- Electric fan use is advisable during severe heat waves, even for the elderly.
- The protective benefits of electric fans during heat waves appear underestimated by current public health guidelines.
- Fans enhance thermal comfort and physiological tolerance to heat stress.
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