Dehumidifiers for swimming pools: how to choose and calculate the optimal dehumidifier

Pool ventilation device technology: an overview

Ventilation, first of all, is necessary to eliminate excess humidity in the pool room. After all, constantly wet walls lose their natural heat resistance and turn into a very convenient platform, literally created for the development of colonies of various representatives of microflora.

Therefore, the basis of all ventilation technologies is either forced condensation of moisture from the air, or the replacement of the entire volume with a new, not yet humid environment.

Pool ventilation

Moreover, the following room parameters affect the technologies and methods for arranging pool ventilation:

• Dimensions of the "evaporator" - the water surface of the pool (its area).
• Room volumes (total area per height).
• The frequency of use of the pool for its intended purpose (in hours per week / month).

And if the room is small, and the pool itself is small, and you use it infrequently, then there is simply no better trivial “drying” technology. Well, if the pool is very large, and the room is far from small and very popular (with a large number of visitors), then you will probably need a high-performance air conditioning unit. And as an intermediate option, you can consider a conventional supply and exhaust ventilation system with and without air dehumidification.

In a word, you already know the recipe, and now let's take a closer look at the composition of these "drugs".

Ventilation system with dehumidifiers: a simple solution to a complex problem

A dehumidifier is a device that condenses excess moisture in the air. Moreover, for effective operation through such a device, it is necessary to pump three times the volume of the air mass of the room in just one hour.

Ventilation system with dehumidifiers

Therefore, solving the problem of waterlogging with the help of dehumidifiers leads to high energy costs, the appearance of noticeable noise pollution and the lack of an influx of really fresh air.

Although such systems have a couple of really strong qualities - this is the compactness of the “dryer” itself and the ability to solve the problem literally “out of the box”. That is, dehumidifiers are supplied for open sale in the form of floor or wall systems, which you only need to buy and turn on, and then wait for the result.

Yes, and the choice of a specific model of the dehumidifier is very simple - it is chosen according to the performance of the device, which implies the already mentioned three-fold "swaying" of the entire volume of the room (floor area per height) in one hour.

Ventilation systems without air dehumidification in the pool

This option involves the elimination of moist air as such and the replacement of the displaced mass with a new medium pumped out from the outside. That is, we have a classic supply and exhaust ventilation.

Supply and exhaust ventilation system without dehumidification

The strengths of this scheme include relatively low energy costs for the process itself and a high result, explained by the actual elimination of the very source of the problem - water vapor contained in the air.

But to implement such a scheme, you will have to build a real ventilation system that transports moist air outside the walls of the building (exhaust duct) and pumps fresh air into the room (supply duct).

Therefore, despite the possibility of arranging a circulation system focused on natural ventilation, implemented due to the difference in the density of cold and warm air, this option will require quite significant energy costs. They will be aimed at heating the supply air and compensating for heat losses caused by the outflow of heated air mass through the exhaust system.

In a word, this is far from the best option.

Multifunctional pool ventilation units: fresh and dry air

Multifunctional pool ventilation units

The idea of ​​building such systems arose as a result of the unwillingness to put up with the heat losses of classical ventilation systems. Such systems combine the efficiency of "dryers" with the economy of circulation plants. Moreover, the intake air is heated by the heat of the exhaust flow (recuperation effect).

Yes, such a system is complex - so it is quite expensive. Yes, it is impossible to choose it "with your own mind" - engineers and designers are needed. Yes, it takes a very long time to install, and I mount it by professionals, not plumbers. But the result will be simply amazing - you will solve all your problems due to simply microscopic portions of energy transmitted to the compressor and dryer.

Design features

The pool water contains chlorine impurities. A feature of dehumidifiers that are constantly operated in a humid environment is the high protection of surfaces from corrosion. During their production, a special anti-corrosion coating is applied to the body and metal parts.

Wall dryer

According to the specifics of installation, air dryers are divided into;

• floor;
• wall;
• located indoors and outdoors.

The control panel of the device, as a rule, is located on its front panel. Alternatively, all manipulations can be performed using PU.

Functions and Options

Regardless of the principles of operation and other characteristics, the dehumidifier must perform its main tasks flawlessly.It must not only maintain and maintain the level of humidity, but also provide the desired temperature, have a high rate of air mass intake, and also perform cleaning.

To make all this possible, various models have features and parameters that make them easier and more efficient to manage. Important indicators of a good dehumidifier are the built-in microprocessor, indicators and filters. All this allows you to control the temperature, moisture level and even the speed of air intake. In advanced models, it is possible to set the operating time and diagnose problems.

Channel climatic complexes

The air dehumidification system and supply and exhaust ventilation, as mentioned above, cannot effectively maintain a comfortable microclimate in a house with a pool without each other. But two simultaneously operating systems are quite energy-intensive. That is why the duct dehumidifier for supply ventilation was created. What is such equipment?

The device of the duct climate complex includes a supply and exhaust ventilation unit, a coarse filter, an air dryer, a heater or a heat exchanger, a control and automation unit. The symbiosis of the supply and exhaust ventilation unit with a dehumidifier can significantly reduce energy costs for maintaining climate equipment, and here's why: the dehumidifier only reduces the level of air humidity. The rest of the work is done by the ventilation unit.

How to choose a dehumidifier for the pool - calculation

Today, there are various types of dehumidifiers for swimming pools.The choice of one type or another depends entirely on the tasks assigned to it, the general humidity, etc.

The following dehumidifiers are most widely used for pools:

Assimilation dehumidifiers for swimming pools are capable of replacing warm air with cold air, thereby effectively eliminating excess moisture in the pool. However, such dehumidifiers for swimming pools are rarely used.

Adsorption dehumidifiers for swimming pools remove moisture with the help of special substances located in the dehumidifier tanks. The principle of operation of an air dehumidifier for pools of this type is quite simple: air passing through the tank gets rid of excess moisture.

3. Condensing dehumidifiers for swimming pools work a little differently than desiccant dehumidifiers. Here air also passes through a separate tank in which it is heated by means of a heat exchanger. At the same time, part of the moisture remains in the tank and then is removed from it through the condensation channels.

To answer correctly the question of how to choose a dehumidifier pool air, first of all, it is necessary to determine exactly which type of air dryer will most effectively cope with the tasks assigned to it.

In many ways, the choice of one or another type of dehumidifier for the pool depends on the configuration of the pool, as well as other equally important parameters.

Wall-mounted dehumidifiers for swimming pools are mounted directly on the wall. Such dehumidifiers have an average power, and of their minuses, it should be noted the need for wiring electricity and the creation of a condensate removal system.

Floor dehumidifiers for swimming pools can be installed directly on the floor.These dehumidifiers do not need installation, their installation is quite simple. An important advantage of floor dehumidifiers is that they can be moved to another place for work at any time, they do not spoil the interior of the pool in any way.

Channel dehumidifiers for swimming pools are complex in their configuration and design. Duct air drying systems are used for arranging large pools, since their use in small pools is simply not justified.

When calculating the dehumidifier for the pool, it is necessary, first of all, to consider the following:

• How high is the temperature in the pool;
• What percentage of humidity should be obtained in the pool;
• How much water is evaporating from the pool. Here we automatically move to the first point about the temperature of the water in the pool.

The formula for calculating a pool dehumidifier is as follows:

H = U x L (Phac - Pust) U is the heat transfer coefficient in the pool, L = volume.

The values ​​P and Phac are the pressure of water vapor, and H is the obtained value of the volume of liquid that should be disposed of in one hour to create a comfortable microclimate in the pool.

How to choose a dehumidifier for the pool is actually simple, the main thing is to correctly calculate the dehumidifier and decide on the type of device that will be installed near the pool.

DIY air dryer

If there is an opportunity and desire, then you can make it yourself, using simple materials and mechanisms for this.

You can see detailed instructions in this video.

There is also an option based on the use of an unnecessary freezer. If you have changed the refrigerator to a new one, do not rush to throw out the old one.Based on it, you can make a good dehumidifier. To do this, in addition to a properly working camera, you will need:

• two fans;
• fixing nuts and screws;
• electric heating device;
• rubber tube;
• organic glass with dimensions corresponding to the freezer.

The sequence of actions will be as follows:

First you need to thoroughly rinse the old refrigerator and try to get rid of the musty smell as much as possible (you can rinse the internal surfaces with a strong solution of vinegar or ammonia - it can be purchased at any pharmacy).
Next, carefully disconnect all the doors from the refrigerator (for this, the hinges are removed with the help of tools, and then the doors themselves are removed).

Next, plexiglass is taken and cut to the dimensions of the refrigerator door - in fact, it will replace the dismantled door.
One of the fans is attached to the bottom of the glass in such a position that it directs air into the chamber itself. It is mounted using self-tapping screws, which are attached to pre-made holes.

The remaining fan is mounted on the opposite side at the maximum distance from the first one (at the top of the glass) - it should blow, on the contrary, into the room.
The rubber tube will ensure the removal of liquefied water from the device. It is attached through a pre-prepared hole, while sealant is used for reliability. A vessel can be attached under the tube, where the resulting water will flow.

Finally, when everything is ready, the glass with fans is fixed to the refrigerator.

Making the device does not take much time. However, if this is not possible and you want to use a reliable device, then it is best to purchase a dehumidifier in a store.

How to choose?

As you can see, although there are a small number of manufacturers on the market, their model range is quite large, which makes it difficult to make the right choice.

Before buying a particular model of air dryer, you should clearly understand for what purposes it will be used. It is necessary to take into account the presence or absence of additional functions, as well as calculate the area of ​​​​the pool and the room where it is located. All this will help you make the right and most effective choice.

To choose the right dehumidifier, you need to take into account a number of points.

The volume of the room where this equipment will be used. Calculate it easily

To do this, multiply the total length of the room by its height and width.
The most energy efficient dehumidifiers should be selected.
Noise level is also an important factor to pay attention to.

By the way, about the last moment, it should be said that it is best to check how the device makes noise while still in the store. This will allow you to make sure that the device will not interfere with the operation of the device. And not always the values ​​displayed in decibels, a person can imagine. For this reason, it is better to run the device and make sure that its operation suits you according to this criterion.

By the way, if the equipment will be used in a region where there is high humidity and at the same time an arid climate with little rainfall, then it is better to give preference to a model with drainage. Then all the moisture through special drains will fall into the reservoir, from where it can be used for some domestic needs.

When choosing such a device, you should also pay attention to the manufacturer.From the best side, the products of European manufacturers have proven themselves, which demonstrate high efficiency and reliability.

You can find out how to choose a dehumidifier for the pool below.

Operating parameters

To ensure an optimal microclimate, depending on the type of pool, it is recommended to set the following water temperatures:

pool type	Water temperature, ˚С
Sports	24-28
recreational	28-30
Children's	29-32
Therapeutic	36
Jacuzzi	35-39
Pool in the bath:
- cold	15
- hot	35

The air temperature in the pool is recommended to be set 1-2 degrees higher than the water temperature. This indicator is optimal in terms of comfort, it also does not allow water to actively evaporate.

Relative humidity in pools is taken in the range from 45 to 60%.

Pools by purpose are divided into:

• sports (swimming, water polo, diving, universal);
• health-improving (recreational);
• entertainment (as part of water parks);
• children's (splashing, for learning to swim);
• "Jacuzzi" (bath with underwater massage).

At the same time, it is necessary to separate the pools of mass (public) and private use, since belonging to one of these categories imposes different requirements on design, construction characteristics, rules of operation and maintenance. The main feature of all pool ventilation systems is the presence of large moisture emissions. And maintaining sufficiently high standard values ​​of air temperature is in conflict with the desire to improve the energy efficiency of the entire system for maintaining the microclimate in the pool.

In this article, we will consider methods for designing and calculating the parameters of a ventilation system for a private pool.Today it is one of the most massive categories of pools. Their number increases with the growth of cottage villages around metropolitan areas. At the same time, private pools have an infinite number of options in terms of the shape of the room, the surface of the water, the geometry of the bottom, the presence of entertainment devices and attractions.

The best dehumidifier models that are great for the pool

When choosing a dehumidifier for the pool, you should focus on those manufacturers that are time-tested and trustworthy. Their price, of course, is higher, but the reliability and high quality of the model is the main thing. Cheap devices will quickly fail. The most famous world climate equipment manufacturers is the Danish company DANTHERM, General Climate, Neoclima, DanVex, Euronord. Consider some models of these manufacturers.

Dehumidifier for swimming pools DANTHERM CDP 35

Advantages

• Highly efficient, virtually silent, compact, economical dehumidifier.
• Has a built-in humidistat.
• Can be installed on the wall or on the floor.
• It has a condenser dehumidification mechanism, which allows you to gently lower the level of humidity.
• The LED panel displays all control processes.
• Complete protection against corrosion even when working with chemicals (housing galvanized, powder coated).
• Low level of electricity consumption, noise.
• It has an automatic defrosting function.
• Automatic shutdown of the device when the compressor stops and restart after 45 minutes.
• High splash protection.
• Compact dimensions.

Specifications

Productivity, l/day	40,8
Air consumption, m3/hour	250
Noise level, at a distance of 1 m from the device, dB	44
Water surface area, m2	Up to 15
Weight, kg	60
Dimensions, mm	800x950x315
Warranty period, years	3
Price, rub	221 940

Installation of the device is possible both on a floor, and on a wall. For floor mounting, a special bracket is required. The dehumidifier is designed according to international quality standards and is completely safe to use. According to the owners, it is effective in use, gradually and gently lowers the level of humidity, maintains a comfortable indoor climate, reduces the cost of repairs and maintaining the premises in good condition.

General Climate CF120BD/A

Reduces humidity in the building, providing comfortable conditions. The model is a vertical block, easy to install and does not require additional equipment.

Advantages

• Compactness.
• Reliability, ease of maintenance.
• It has an electronic panel that regulates the set parameters.
• There is an adjustable fan speed.
• Additional space heating.
• Automatic defrosting.
• Plate heat exchanger.
• Filter for air purification from dust.

Specifications

Productivity, l/day	120
Air consumption, m3/hour	850
Noise level, at a distance of 1 m from the device, dB	52
Room area, m2	120-150
Weight, kg	65
Dimensions, mm	1730x480x270
Operating temperature, °C	15-43
Price, rub	84 600

According to consumer reviews, these dehumidifiers have proven themselves well. They are simple and reliable, prevent moisture and corrosion, are made in a modern style, fit well into any design, and have high performance.

Dehumidifier DanVex DEN-600wp

Updated model of the Finnish manufacturer. Modern housing, compact dimensions, can be mounted both on the wall and on the floor with the help of an additional installation. Has a remote control.

Advantages

• Heat exchangers are made of stainless steel with antibacterial coating.
• The dehumidifier can be turned on and off according to a schedule.
• The value of the set and actual humidity is displayed on the control panel.
• The body and all structures are made of powder-coated stainless steel.
• Built-in clock.
• There is a ventilation mode.

Specifications

Productivity, l/day	60
Air consumption, m3/hour	430
Water surface area, m2	up to 25
Voltage, V	220
Weight, kg	50
Dimensions, mm	915x280x670
Power consumption, kW	0,9
Price, rub	177 500

According to customer reviews, a very convenient water drainage system allows you to drain water back into the pool or into the drain. The dehumidifier is built into a new attractive housing, there is a remote control.

Choosing a home dehumidifier

There are several factors to consider when purchasing a home appliance:

The volume of an apartment, room, country house or other premises

It is easy to calculate it by multiplying the total length of the apartment by its width and height.
In addition, it is important to choose the most energy-efficient devices that consume as little energy as possible. Finally, the noise level in the apartment is of particular importance.

As for the manufacturer, everything that has been said about professional dehumidifiers is also true for home ones. European brands have successfully established themselves in this market, moreover, they always give a long-term guarantee of trouble-free operation of the mechanism.
Some models are shown in the table below.

Model	Price, rub
Dantherm CDF 10	75 000
Timberk DH TIM 20 E2W^	7 000
Ballu BDH-35L	12 000
Ballu BDM-30L	14 000
Ballu BDH-25L	11 000

A video review of the Ballu BDH 30L is shown below.

As you can see, the prices for the devices are quite affordable. Basically, they depend on the performance of the device, and that - on the volume of the serviced premises.It is from this factor that you need to proceed in the first place.

Calculation of moisture evaporation rate

For the correct selection of a drying system, it is necessary to calculate the intensity of moisture evaporation.

Calculations are carried out according to the formula regulated by the European standard VDI 2089.

For example, let's calculate the evaporation rate for a small pool with a water surface area of ​​30 m2.

Let's take the temperature of the water in the pool equal to +28ºС, the air temperature in the swimming room +29ºС, the value of the water vapor pressure in the room РB we will take 33.6 mbar. Assume that the fixed air humidity is 65%.

First you need to calculate *РL - the value of the partial pressure of evaporating moisture. To calculate it, we find the value of PL100 (with humidity parameters of 100%) according to the table of gradation of elasticity of saturated water vapor depending on the temperature of the water in the pool bowl. According to our conditions, this is 40.07 mbar, which must be multiplied by 0.65.

Table with average values ​​of air elasticity at a conditional humidity level of 100%:

PL100 (value at 100% humidity) × 0.65 (65%) = 40.07 × 0.65 = 26.05 mbar W = e × A × (PB - PL) = 15 × 30m2 × ( 33.6 mbar - 26.05 mbar) = 3397.5 g/h ≈ 3398 g/h = 3.398 kg/h.

With the data taken as a basis in the example, 0.11 kg of moisture will evaporate from 1 m2 of water surface in the pool.

This is a simplified scheme for calculating the intensity of evaporation of private and public pools, but if you wish, you can use another method using the Byazin-Krumme formula.

On average, in a room with a swimming pool with 1 sq.m. mirrors of water evaporates 150-250 gr. moisture per hour.The amount of evaporation depends on the difference between the temperature of water and air. In order to evaporate the minimum amount, the air should be warmer by no more than 1-2 °.

The easiest way to reduce evaporation by 1.5 times is a floating polymer coating. Additionally, it prevents the cooling of water and the ingress of debris. However, this option is only suitable for small pools and hot tubs.

Purpose of the device

Excess moisture results in the accumulation of condensate on the walls, ceiling, windows, and also contributes to the development of microbes, the appearance of mold and corrosion in enclosed spaces with an artificial reservoir. This phenomenon threatens with an uncomfortable environment for visitors, because the preservation of a waterlogged microclimate can cause people who are prone to cardiovascular diseases, asthma attacks or shortness of breath. In addition, there is a high probability of contracting various diseases due to the multiplication of harmful microorganisms in these places.

Excessive humidity leads to wear and tear of the equipment and the destruction of the decoration of the rooms, which will eventually require repairs to the building.

For these reasons, it is advisable to install dehumidifiers in rooms with a swimming pool. They provide control and maintenance of an optimal level of humidity, absorb condensate and give out dry and warm air.

Sometimes the question arises: why this task cannot be dealt with by applying air exchange or ventilation? Firstly, it is energy-consuming, and secondly, they will not be able to create favorable conditions in such premises, namely the optimal temperature of water (25-29°С), air (27-30°С) and humidity level (50-60 %).Therefore, it is better to take care of the dehumidifier even during the design of the pool.

You can get acquainted with the scope and features of the use of dehumidifiers from this video:

Features of choosing a dehumidifier for swimming pools

The performance of the dehumidifier is selected primarily depending on the area of ​​the water surface. For a small private pool up to 40–50 m² with a protective coating, the capabilities of one of the inexpensive units will suffice. If we are talking about large commercial facilities, then more powerful equipment is needed here. In this case, it is better to entrust the selection of a specific model of a dehumidifier for a pool to a professional. Here, in addition to the area, you also need to consider:

• the number of visitors and the type of their activity;
• water temperature;
• operating parameters of ventilation equipment.

The performance of dehumidifiers is measured in terms of the amount of moisture released from the air per hour.

The pool dehumidifier, depending on the model, can be installed next to the water, in an adjacent or remote room. If the unit is in sight, then it has a body with an attractive design.

Typical layouts

Systems for providing a favorable microclimate in a room with a pool are equipped in accordance with one of the standard schemes.

Option number 1

The easiest and cheapest way to reduce the level of humidity in the pool is to install monoblock wall or floor dehumidifiers in the amount of 2 to 5 pieces, depending on the actual evaporation area.

This solution is perfect for small rooms with a low intensity of visits.Where it is much easier and more reasonable to periodically ventilate than to install an expensive duct system (+)

Option number 2

A circuit operating on the principle of partial recirculation, i.e. with the intake of a fresh portion of air from the street, which is mixed with the dried and heated air mass captured in the pool.

It is used at facilities with a high degree of attendance, requiring a constant admixture of oxygen and the removal of carbon dioxide. To discharge excess air mass, an independent exhaust system is being built (+)

Option number 3

Channel systems installed in separate compartments are used. Dehumidifiers are combined with supply and exhaust ventilation, which guarantees full air exchange in the pool hall.

The installation performs several functions at the same time. It removes 50% of the exhaust air from the pool, captures a part equal to the remote portion on the street, mixes them and dehumidifies them to the required parameters (+)

Option number 4

The scheme uses wall-mounted built-in or simply mounted dehumidifiers, the operation of which is not associated with supply and exhaust ventilation. The dehumidifier turns on when the humidity level set by the owner of the pool is exceeded.

The air flow is supplied in the lower part of the room, almost at the level of the water table. Extraction of the air flow is carried out through the exhaust holes mounted in the ceiling (+)

Option number 5

The wall-mounted monoblock dehumidifier works in tandem with the supply and exhaust system, which performs partial dehumidification of the air mass in the pool.

The monobloc dehumidifier is only switched on if the ventilation circuit is unable to cope with the task of lowering the humidity level (+)

Focusing on the standard solutions proposed for consideration, you can choose the best option for arranging your own pool or improve one of the most suitable schemes according to specific technical conditions.