How does a hand dryer work?

- Jun 15, 2018-

The working principle of the hand dryer: When the sensor in the hand dryer detects the signal (and), then this signal looks at the control to open the heating circuit relay and the blower circuit relay, and starts to heat and blowing. When the signal detected by the sensor disappears, the contact is released, the heating circuit and the blower circuit relay are disconnected, and heating and blowing are stopped.

Heat-based and high-speed air drying

Heater-based hand dryers usually have a relatively high heating power of over 1000 W, and the motor power is very small, only less than 200 W. This type of hand dryer is typically characterized by extreme wind temperature and high wind resistance. The water on the handle is made away. This method of drying hands is slow, generally more than 30 seconds. The advantage is that the noise is unimportant, so it has been favored by quiet spaces such as office buildings.

High-speed air hand dryer, characterized by a very high wind speed, up to 130 meters / second, dry hand speed within 10 seconds, the heating power is relatively low, only a few hundred watts, the heating function is only to maintain comfort Degree, basically does not affect the speed of dry hands. Because of the fast hand speed, they are well received by food factories, pharmaceutical factories, electronics factories, and high-end office buildings (with good sound insulation). They are also recommended by environmentalists due to their low energy consumption and dry hand speed of paper towels.