The principle of dehumidifier:
Wet air is sucked into the machine by the fan, and the moisture in the air is condensed into water droplets by the heat exchange system, and then the treated dry air is discharged outside the machine, and the relative humidity is reduced through air circulation.
Dehumidifiers, also known as dehumidifiers, dryers and dehumidifiers, can be generally divided into three categories: home dehumidifier, commercial dehumidifiers and industrial dehumidifiers. Generally, a conventional dehumidifier consists of a compressor, an internally threaded copper tube, a sensor, a turbofan, a water container, a shell and a controller.
Classification:
1, condensing dehumidifier
The principle of condensation dehumidifier is very simple, which can be simply compared to taking out a bottle of beer from the refrigerator. After a while, the beer bottle was covered with small drops of water. That is, water vapor in the air will condense into liquid water when it is cold.
According to this principle, the dehumidifier sucks humid air into the machine, drives the heat exchanger (evaporator and condenser) through the compressor, condenses the moisture in the air into water droplets for collection, and then exhausts the dry warm air outside the machine, thus reducing the indoor humidity.
The advantages of condensing dehumidifier are mature technology, low price, and energy saving due to the use of compressor to transport energy, which is the main technology used in home dehumidifier at present. However, its shortcomings are also very obvious. One is the noise (compressor+fan noise+machine * * * vibration), and the other is the low-temperature dehumidification efficiency that can't even work.
The first point is that everyone has an air purifier at home, which should be easy to understand. The second point is that the low-temperature dehumidification effect is not good, mainly because the temperature at the evaporator end will be lower than the room temperature in the low-temperature environment, resulting in frost on its surface. Once frosted, the working efficiency of heat exchangers will be greatly reduced, and the heat exchange cores of cooling dehumidifiers, air conditioners and even refrigerators and fresh air systems will be on the verge of failure due to frosting. Therefore, the condensing dehumidifier cannot operate normally under the condition of low temperature and high humidity, and it is likely to defrost, defrost and defrost again.
Therefore, when the humidity required by the environment is above 45%, we can choose the freezing dehumidifier. However, some places, such as laboratories and lithium battery industry, will require lower humidity. At this time, it is necessary to introduce a new dehumidifier: a rotary dehumidifier.
2. Rotary dehumidifier
The working principle of the rotary dehumidifier is to continuously provide dry air with low dew point without affecting air circulation by repeatedly absorbing moisture and regenerating. Figuratively speaking, the rotary dehumidifier is like absorbing moisture in the air with a dry towel and discharging it through drying.
The biggest difference between condensation dehumidifier and condensation dehumidifier is that condensation dehumidifier realizes condensation dehumidification by lowering temperature. Rotary dehumidifier dehumidifies by heating and condensing. Although this approach seems to be completely contrary to the principle just mentioned, the principle is still the same.
But different from condensation dehumidification, the rotary dehumidifier absorbs the water vapor in the air through the rotating hygroscopic turntable, and then the heated high-temperature dry air takes away the moisture on the turntable, and then condenses the high-temperature wet air at room temperature to achieve the purpose of dehumidification. Because there is no heat pump, heating air is completely realized by energy conversion, so its energy consumption is high. Secondly, the hygroscopic efficiency and regeneration efficiency of the hygroscopic rotary table are limited, so its dehumidification capacity will be much lower than that of the condensing dehumidifier, for example, the price is 2000, and the condensing dehumidifier can reach 20L/D or even 40L/D, while the rotary dehumidifier can only achieve 6-8L/d..
Of course, it is not without advantages. Its biggest advantage is that its dehumidification ability is not affected by environmental temperature and humidity, and it can dehumidify under any temperature and humidity conditions. In other words, if dehumidification is needed in winter in the north, then the rotary dehumidifier is basically the first choice. And various special environments with humidity requirements below 45%. Students who are warm and humid in the south can choose a more economical and efficient condensation dehumidifier.
The above is what Bian Xiao shared today, and I hope it will help everyone.