A little science about humidifiers
January 25, 2021
A little science about humidifiers
There are three common types of household humidifiers, namely ultrasonic humidifiers, electric heating humidifiers and pure humidifiers.
Ultrasonic humidifiers have been on the market for many years, using the principle of ultrasonic high-frequency oscillation to atomize water into ultrafine particles of 1~5μm, and diffuse the water mist into the air through a pneumatic device to achieve the purpose of uniformly humidifying the air. Ultrasonic humidifiers have strong humidification strength, uniform humidification, high humidification efficiency, and have the advantages of power saving and long service life. They have been very popular. However, the shortcomings of ultrasonic humidifiers are also obvious, that is, there are certain requirements for water quality. In addition to humidifying the air daily, this humidifier can also be used to beautify the bathing surface.
The electric heating humidifier is the simplest humidification method. It uses a heating element to heat water to the boiling point, and then generates water vapor to release into the air. There is no requirement for water quality, but the disadvantage is that it consumes a lot of energy, cannot be dry-burned, has a low safety factor, and is easy to scale on the heater.
The pure type humidifier is a new technology just adopted in the humidification field. It uses molecular sieve evaporation technology to remove calcium and magnesium ions in the water and completely solve the "white powder" problem caused by poor water quality. The air is washed through the water curtain, while the air is humidified, the air is purified, and then the humid and clean air is sent to the room through the wind device, thereby increasing the environmental humidity. The new generation of pure humidifier adopts fuzzy control, which automatically adjusts the amount of humidification according to temperature and humidity changes, and uses the principle of dynamic balance to control the relative humidity of the environment between the most suitable 45% to 65% RH for the human body. When the indoor relative humidity is higher than 50%RH, the humidifier will automatically reduce the amount of humidification, so that the environment is always in a constant humidity state, and is not restricted by water quality. This kind of humidifier can also filter the air and kill bacteria, not only make the humidification more pure, but also wash the air with pure water, effectively remove the pollution in the air, promote the indoor air circulation, ensure human health to a greater extent, and reduce the respiratory tract Probability of infection.
The high-pressure spray humidifier is an isenthalpic humidification method in which the filter, pump unit, water tank, and control box of the humidifier are installed in the workshop or computer room, and the spray system (nozzle, pipe) is installed on the top of the workshop. This humidification method is to pressurize the tap water through the main humidifier and pass it through ultra-fine filtration, then spray it through a special nozzle atomized at a high speed to form 5~10μm water mist particles, exchange heat and humidity with the flowing air, and absorb the air. The heat in the air is vaporized and evaporated to increase the humidity of the air, realize the humidification of the air, and at the same time play the role of cooling and controlling dust. The high-pressure spray humidifier can independently cool the workshop, humidify and spray liquid.
The working principle of the wet film evaporative humidifier of the central air conditioner is very simple. The water flows from the top of the wet film through the steam trap along the corrugated surface of the wet film evenly, so that the wet film is evenly moistened from top to bottom. When the dry heat When air flows over the surface of the wet film, it exchanges heat with the moisture in the wet film. The moisture is heated to evaporate into water vapor into the air, increasing the humidity of the air, and turning the dry hot air into clean and humid air.
