Electric fan: distinguish between dry heat and damp heat_Industry News_News

Industry News: Company News

Industry News

Knowledge

hot

contact

Electric fan: distinguish between dry heat and damp heat

Time：2021-11-24Views：0

This year's hot and humid heat wave broke the record of high temperatures in Europe and swept parts of the United States at the end of July; however, the southwestern United States, the Middle East, and parts of Australia experienced intense dry and hot weather.

Both high temperature and high humidity and high temperature and dryness may be dangerous, and the initial human response to both is often to blow a fan or turn on an air conditioner. However, according to a new study published in the Annals of Internal Medicine on August 5, 2009, in a dry heat wave, turning on the electric fan may not help to cool down, and may even make your Increased body temperature.

Researchers from the University of Sydney recorded the physiological responses and body comfort of 12 healthy men under different heat waves. The artificial climate chamber built by the research simulates heat wave weather by controlling temperature, humidity and air flow. The subjects sat in two different environments for two hours each: dry heat (heat index of 46°C) and damp heat (heat index of 56°C). Then return to the artificial climate room and wait for two "heat waves"-standard fans are placed about four feet away from them. Researchers took four different methods to measure the potential heat stress experienced by volunteers: rectal temperature, cardiac pressure (using heart rate and blood pressure), dehydration, and the thermal comfort report they filled out on a standardized scale.

The result was unexpected. In a hot and humid environment (heat index of 56°C), the fan lowered the core body temperature of men, reduced the heat-related stress on the heart, and improved their thermal comfort. However, under hot and dry conditions (heat index of 46°C), fans increase body temperature, pressure on the heart, and thermal discomfort. In other words, the fan works better at a higher thermal index temperature. The explanation given in the article is that fans work well in humid environments because they help accelerate the evaporation of sweat or moisture on the skin. But when the weather is dry, the fan works like an oven, blowing more hot air toward the body.

Previous Back to list Next

news center

200x200x60mm Industrial Strong Air Ventilation Fans Cooling Elctric axial flow DC fans

Electric fan: distinguish between dry heat and damp heat