How to dehumidify in low temperature environment?

Relative humidity is an important environmental parameter, and its influence on indoor objects is second only to temperature. With the development of social economy, people pay more and more attention to humidity. In the application of different industries such as food, medicine, seed and fruit storage, there are corresponding humidity requirements. Therefore, people need to use dehumidifier to dehumidify at low temperature, so that the indoor environment can meet the corresponding humidity requirements. However, the low-temperature dehumidifier used at different temperatures is different, which makes users wonder how to choose. This paper focuses on how to dehumidify in low temperature environment.

The low temperature we usually talk about is a range concept. For example, it can be called low temperature below 18 degrees, but the dehumidifiers needed at different temperature nodes are different. For example, the conventional dehumidifier can be used below 18 degrees, the frozen dehumidifier with electronic frost function can be used below 10 degrees, and the rotary dehumidifier is needed below 5 degrees. Different types of dehumidifiers have great differences in functions, principles and materials, and the cost is also very different. Therefore, we need to choose the dehumidifier according to the specific situation.

The general environment and temperature are as follows:

Shade means no more than 20℃;

Cool and dark place means that it is not more than 20℃ away from light;

Cold storage refers to 2 ~ 10℃;

Normal temperature refers to 20 ~ 30℃;

Cold storage refers to below 5 degrees.

With the development of dehumidifier technology and industry, at present, conventional frozen dehumidifiers all have electronic automatic defrosting function, and the old dehumidifiers without defrosting function have long since withdrawn from the historical stage. Therefore, any dehumidifier we buy can be used in a low temperature environment, and the applicable ambient temperature is 5-38℃. When used in the normal temperature environment, the dehumidifier works normally, and when used in the shade below 20℃, the dehumidifier is prone to frost after the temperature drops to the dew point, so it is necessary to use defrosting properly, and the dehumidification effect will be reduced. In the refrigeration type of 2-10℃, the dehumidifier is more prone to frost, and it takes longer to defrost, so the dehumidification effect becomes worse. In the environment below 5℃, the dehumidifier is easy to freeze, because in this environment, the dew point temperature of air generally needs to reach below 0℃, so the dehumidification effect is very poor, or even not dehumidified.

Therefore, how to dehumidify in low temperature environment needs to be configured according to the specific indoor temperature. The lower the temperature, the larger the dehumidifier needs to be configured. The loss of defrosting time is compensated by increasing the amount of dehumidification in the same time. Especially below 5 degrees, it is not recommended to use a freezing dehumidifier, and an adsorption type rotary dehumidifier can be configured to meet the humidity requirements.

Common sense about dehumidifier I

Most consumers always have a lot of doubts when they use or buy dehumidifiers for the first time because of their lack of understanding of dehumidifiers. Today, I list six common sense of dehumidifiers for you to help you have a more accurate understanding of dehumidifiers, in case you fall into a misunderstanding and buy the wrong machine.

1. Which products need environmental humidity control?

Some consumers have been drumming in their hearts about the need to choose a dehumidifier. In fact, optical lenses, magnetic recording materials, image films, electronic information media, electronic components, instruments, meters, powder materials, paper, wood, silk, leather, food, tea and grain in industrial products are all items that need humidity control. With the dehumidifier, these items can be protected from moisture interference during storage and use, and the quality and service life can be better guaranteed.

2. Where is the dehumidifier installed?

In the placement position of dehumidifier, it should be avoided to be used next to heat source, and the air inlet and outlet should be kept smooth. Under normal circumstances, dehumidifier should be placed in the center of space, and there should be enough space around it, so do not pile up items. Keeping the air smooth can achieve uniform dehumidification effect.

3. Why can the dehumidifier pump water?

At present, dehumidifiers mainly have two dehumidification principles: freezing dehumidification and adsorption dehumidification. The freezing dehumidifier uses the principle of compressor refrigeration to dehumidify, which has mature technology, simple operation, low cost and fast dehumidification, and is a relatively common dehumidifier at present. The dehumidification process is to suck air into the machine to cool down, so that the wet air condenses into water on the two devices, and then is directly discharged outside through the drainage pipe. Adsorption dehumidifier uses imported special fiber materials to absorb moisture indoors and release moisture outdoors, and works repeatedly to achieve the purpose of dehumidification. It has strong dehumidification ability and can be used in low temperature and low humidity environment, but it is mainly used for industrial purposes because of its high cost.

4. Does the dehumidifier have requirements for the environment?

The use environment of conventional dehumidifier with good effect is 20-30℃. When it is used at low temperature (below 10℃), it will frost or freeze, and it is necessary to dehumidify and defrost at the same time, so the overall dehumidification effect is reduced, and it will not even dehumidify below 5℃ because the dew point temperature is too low. In the high temperature environment above 38℃, the conventional dehumidifier can't be turned on because of the overheat protection function of the compressor. Only the customized high temperature-resistant dehumidifier can be applied, and the upper limit of application temperature can reach 55℃. The adsorption type rotary dehumidifier should not be affected by the ambient temperature.

5. What is the dehumidification capacity?

We often see the indicator of dehumidifier's technical parameters, and we often hear professionals distinguish the size of the machine according to the dehumidifier. The dehumidifier mentioned in these places actually refers to the nominal dehumidifier, which is the result measured under the standard environment (constant temperature and humidity). For example, the dehumidifier standard is 50 liters/day, which refers to the outlet volume measured for 24 hours at 30℃/RH80%. The standard temperature and pressure of industrial dehumidifiers is generally 27℃/RH70%. In the specific use, the actual dehumidification amount will be slightly different due to the change of environment.

6. Why do you need to use a dehumidifier?

Humidity in the air is as ubiquitous as temperature, especially in Huangmei season when the temperature is not high and the humidity is high, people feel sultry and uncomfortable. At the same time, the damage caused by humidity and mold to metal oxidation occurs unconsciously at any time. When the relative humidity is more than 60%, mold can grow, and when the humidity is more than 85%, it is a high incidence environment for mold. Therefore, choosing a dehumidifier can effectively prevent moisture and bring people a dry living environment.

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