Home » Hand dryers: principle of operation, manufacturers, types and benefits

Hand dryers: principle of operation, manufacturers, types and benefits

by Grace D

To dry your hands after washing, you do not need to come into contact with materials whose purity is questionable. Electric hand dryers (electric towels) cope with this task. Dryers for hands are installed in public restrooms, residential and medical facilities, and other sanitary places.

Description of how the hand dryer works

Non-contact drying of hands occurs due to the operation of the fan and the heating element, which are located under the body of the device. The built-in infrared sensor reacts to an object that is under the air outlet, after which it instantly turns on the dryer. The flow rate for different models is 10-105 m / s, and the temperature is 40-70 degrees Celsius.  Moisture evaporates and blows away from the hands thanks to the heated airflow in 5-12 seconds, depending on the technical characteristics of the hand dryer.

Some models of hand dryers are equipped with air filters and disinfecting UV LED lamps, which reduce the likelihood of dust and allergens on the skin, as well as destroy harmful microorganisms that have settled on hands.

Types of hand dryers

Hand dryers are divided into several types according to a number of characteristics: the material of the body, the method of removing moisture, and the type of start.

The casing of the hand dryer is made of plastic or metal. The surface of the hand dryer body can be glossy or matte. Steel hand dryers (hand dryers) are classified as anti-vandal. They withstand high mechanical loads, therefore they are designed for a long service life with a large number of inclusions in places with high traffic.

According to the drying method, hand dryers (hand dryers) are divided into two types:

  • classic (standard), in which the airflow is directed from top to bottom, its speed is low, and the temperature can exceed 50-60 degrees, for example, BXG Hand Dryer – 165.
  • High-speed, where a powerful air jet is blown out at a speed of up to 105 m / s when heated below 50 degrees.

Hand dryers of the first type evaporate the moisture remaining on the hands, which are substituted under the outlet at a distance of about 20 cm. The second ones blow off the water, while excess liquid flows into a special tray.  Such dryers are called submersible, for example, BXG hand dryer – JET-7000.

By the type of start, push-button and automatic hand dryers are distinguished: the first ones are turned on by pressing a button on the case, the second ones – by a signal from the sensor, without additional human actions.

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Benefits of hand dryers

Pros of using hand dryers:

  • hygiene due to the lack of contact of the hand dryer with the skin;
  • safety for users due to protection against electric shock;
  • the acceptable noise level that does not disturb other visitors and staff (65-75 dB);
  • compact dimensions;
  • reduction in organization costs, as a result of refusing to wash textiles or regularly purchase paper towels;
  • reliability and durability as a result of the use of high-quality materials and parts.

Classic hand dryers are inexpensive, but due to their low flow rate, they dry out moisture more slowly than high-speed ones and also consume more electricity. A heated stream of air dries out, and injures sensitive skin.

Places where hand dryers are used

Hand dryers are indispensable in institutions where hand washstands are located:

  • in change houses of industrial enterprises and construction organizations;
  • medical institutions;
  • toilets, classrooms, laboratories of educational institutions;
  • in catering departments;
  • public toilets;
  • in locker rooms, shower rooms of sports and entertainment facilities;

The Merida Hand Dryer MODEL TOP M55T is one example of a low-power compact hand dryer in demand among apartment and house dwellers.

Hand dryer manufacturers

High-quality industrial hand dryers are produced by Merida (Poland), Ksitex, and BXG (China). Many models of hand dryers on the domestic market turn on automatically. It is easy to distinguish one view from another by clear designations and well-marked buttons on the front panels. 

Hand dryers differ in power, temperature and air-jet speed, average drying time. Some versions of hand dryers blow out only cold or hot air or support a change in temperature to suit a particular user.

The body of hand dryers can be flat or convex. Some models are only 10 cm thick. The weight of most hand dryers with a nozzle pointing downwards does not exceed a few kilograms. Immersion hand dryers weigh over 10 kg.  A variety of shapes allows you to choose a hand dryer model that fits perfectly into the interior.

Hand dryers are energy efficient as they turn on quickly and turn off quickly. The maximum continuous operation time of the hand dryer is within 1 minute. This is enough with a margin to dry your hands wet under running water or in the sink.

All hand dryers comply with industry-accepted standards, and sanitary and hygienic standards and are subject to mandatory certification.

Hand dryers do not require consumables to operate. A properly installed hand dryer will last for years without fail and quickly pay for itself by eliminating the expense of cloth towels and the effort associated with recycling paper waste.

 

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