Dehumidifiers

Types of dehumidification1. Dehumidify by heating and ventilation - this is a way of raising the temperature in the dried room and its intensive ventilation. In this method, care must be taken to ensure that the temperature in the dehumidified room does not exceed 35 ° C, as the humid walls or walls may be cracked. Also improper ventilation or lack of it can lead to water vapor ingress into dry parts of walls and ceilings.Dehumidifying by ventilation and heating is unfortunately quite expensive. This is mainly due to low dehumidification efficiency because it is a long-term method and requires the use of high-power heating devices. 2. Condensate drying (cooling, refrigerating) - this is the most common and used drying method. Condensing dryers act like refrigerators, where moisture is precipitated from the cooled air. The efficiency of the dehumidification depends on the conditions in which the device operates. The higher the temperature and the relative humidity, the better the results. Dry air temperature is typically 3 - 8 ºC higher than suction air temperature. Thanks to this increase in tem- perature, it is possible to quickly evaporate moisture from walls and ceilings. No condensation is required for air exchange, as opposed to dehumidification by ventilation and heating.Condensate dryer is built with the following components:compressorCondenser and evaporatorExpansion elementCooling dehumidification is usually two-stage. In the first phase the air is cooled in the exchanger from 40 ºC to 20 ºC. Further, the air passes through the evaporator where it is re-cooled until it reaches the dew point. It then passes through a water-oil condensate separator. The air thus obtained also serves as a refrigerant in the exchanger responsible for the first cooling phase.3. Adsorption dehumidification - With this method, moisture from the air is absorbed by the container containing hygroscopic materials acting as adsorbent (granulated aluminum gel or nanofilter). Then, by about 5 minutes, the adsorbent is regenerated by passing through the dried air through which it receives moisture and transfers it to the second hygroscopic container. Tanks in the adsorption dryer always work alternately. The regeneration of the adsorbent causes about 15% of the delivered air to be lost. The advantage of using adsorption dryers is the ability to dehumidify below 0 ºC.The adsorption dryer is constructed of:Rotor with power unit (made of aluminum sheets coated with hygroscopic substance)fansAir heaterfiltersEnclosures and accessoriesDuring the operation of the adsorption dryers, care should be taken to ensure that no oil is absorbed into the interior as this results in reduced performance. 4. Absorption drying - this is a method similar to adsorption dehumidification. However, it has two significant differences. First, the absorbing material is the absorbent material. The second difference is the duration of the dehumidification process which lasts several hours, as is the regeneration process which runs hot.