How to choose a dehumidifier?

This is a device that allows condensation of moisture from the air and in the form of water to drain it into the drainage system (sewage). All condenser-type chillers are a refrigeration machine in which the evaporator and condenser are arranged in series, one after another. On the evaporator, the moist air is cooled, the moisture contained in it is condensed and removed, and the cooled air, continuing to move, passes through the condenser, where it heats up to a temperature slightly higher (about 5 °
C) than the temperature of the air taken in.

If the principle of work remains incomprehensible, imagine a usual, well-known split system , in which the outdoor unit immediately stands behind. Passing through the indoor unit, the air is dried and becomes cool, after which it immediately enters the entrance of the outdoor unit, where it is already heated, and the heated enters the room. The scheme is simple and effective, therefore it is implemented in various forms and options.

Types of dehumidifiers

1. Floor (mobile) type. The device is on legs, takes air in the lower part and throws it up. Condensate is collected in an integrated tank. Design and noise specifications vary by manufacturer.

  • Pros: No installation required, no roads, easy to move.
  • Cons: Occupies a place on the floor, may not meet design requirements, makes noise, requires periodic emptying of the tank with condensate.

2. Wall type. It differs from the previous one in more power / performance, and as a result, weight / size, which implies a rigid wall mount. Requires a cable and drain pipe to drain condensate into the sewer.

  • Pros: Easy installation, still relatively inexpensive.
  • Cons: It requires a wall on which it can be hung, having previously failed the drainage and the power cable, and which it will not spoil the appearance much. The noise.

3. Channel type. This type works with a duct system and is installed in a technical room.

  • Pros: Great power, does not spoil the design, makes noise where it doesn’t bother anyone.
  • Cons: Pretty complicated installation, price.

4. As part of an air conditioner. Supply and exhaust systems with a built-in desiccant are technically very complex, they are characterized by a high coefficient of energy efficiency (due to heat recovery), and high accuracy of maintaining parameters in the served room.

  • Pros: Profitability, accuracy of parameters maintenance.
  • Cons: Price.

The first two types of dehumidifiers can be used independently of the ventilation system, turning on and off as you wish. In the third type, automation, as a rule, is interconnected with automation of the ventilation system, and the dehumidifier works in conjunction with ventilation. The fourth type does not involve consumer intervention in the installation operation algorithm. The mere fact of using a dehumidifier in no way can guarantee the onset of a climate paradise in a single basin. After all, the use of a dehumidifier is just a way to maintain the humidity characteristics of the air within certain limits. The most comfortable conditions are achieved, as a rule, by using ventilation system , designed for a specific pool and for specific operating conditions.

A distinctive feature of ventilation for the pool, in contrast to the general exchange, is the high temperature of the supplied air, the increased rate of air exchange, and the peculiarity of the location of the grilles.

The temperature of the air supplied to the pool should be about 2 °
C higher than the temperature of the water in the pool and usually fluctuates around 28 °
C. With this temperature regime, the transfer of moisture from the surface of the water to the air is minimal. When the air temperature is lower than the water temperature, its intensive evaporation begins. In turn, heating the air to such a temperature entails increased energy consumption of the supply unit, which can be reduced by using a scheme with recovery and drainage.

As for the location of the grilles, the supply grilles are trying to place as low as possible (if possible, it can be on the floor), under the windows or in the immediate vicinity of them. In some cases, the supply air is supplied via floor convectors. Exhaust grilles are located on the ceiling, above the pool mirror. This arrangement of the grilles provides the most efficient movement of air flows inside the pool, and, as a result, maximum comfort.


Summing up, you can highlight the main points when choosing a dehumidifier:

  1. The pool must have a supply and exhaust ventilation system designed specifically for this pool.
  2. A dehumidifier cannot replace a supply and exhaust ventilation system, although a channel dehumidifier can serve as the basis for constructing a ventilation system on its basis.
  3. The use of a dehumidifier together with a ventilation system leads to a reduction in energy consumption (achieving the desired result with less energy).