Supply and exhaust ventilation equipment for cottage pools. Ventilation units for swimming pools

Air parameters

The ventilation system must maintain certain air parameters in the pool room:

• Temperature. Not only the comfort of people depends on it, but also the rate of evaporation of moisture from the surface of the water. Therefore, the air temperature should be slightly (1-2°C) higher than the water temperature (if the water is warmer than the air, then the evaporation of moisture increases significantly). For private pools, the recommended air and water temperatures are 30°C and 28°C, respectively. To heat the supply air to a given temperature in inexpensive direct-flow systems, water or electric heaters are used. In supply and exhaust units, to save energy, in addition to the air heater, heat recuperators can be installed, usually based on plate recuperators and heat pumps (recuperators heat the supply air using the heat of the exhaust air). If the outside air temperature can exceed the indoor air temperature for a long time, then it is necessary to use a ventilation system with a cooling function.
• Humidity. This is one of the most important air parameters, which affects the safety of the finishing and structural elements of the pool room. If air humidity exceeds a safe level for a long time, structural elements may become unusable - covered with rust and mold due to the formation of condensation. Therefore, during non-working hours, to reduce evaporation from the water surface, it is recommended to cover the surface of the pool with film. Note that it is necessary to monitor and manage relative, not absolute humidity (moisture content). Relative humidity at constant moisture content strongly depends on temperature, so a decrease in temperature by 1°C leads to an increase in humidity by 3.5%. To reduce air humidity, two methods are used:
  • Assimilation of moisture by outside air, that is, supplying outside air with a low moisture content to the room and removing humid air from the room. This method works well in winter when the moisture content of the outside air is low. In summer in central Russia, assimilation of moisture by outside air is also possible, but it should be borne in mind that in hot and rainy weather, the moisture content of outside air may be higher than that of inside air, and then this method will not work.
  • Condensation drying on the surface of the evaporator. They work on this principle. The dehumidifier can be made as a separate unit or built into the ventilation unit. Note that the name dehumidifier for this unit is not entirely accurate. A more general name would be more correct: refrigeration machine or a refrigeration circuit, since this unit not only reduces air humidity, but also transfers heat from the exhaust air to the supply air (heat pump), and when the direction of movement of the refrigerant changes, it can cool the supply air.
  The humidity in the pool room should be maintained at 40-65%, while in the warm season a higher level of humidity is allowed, since there are no cold surfaces in the room on which moisture condensation is possible. Based on this, the recommended values ​​for relative air humidity are: up to 55% in summer, up to 45% in winter.
• Fresh air quantity. The minimum volume of fresh air supplied is determined by sanitary standards (80 m³/h per person) and the need to assimilate moisture from the air (in the absence of a condensation dehumidifier). In summer, the volume of supplied air is usually higher than in winter, since during the warm period the difference in moisture content between indoor and outdoor air is lower.
• The ratio of supply and exhaust air. It is recommended to maintain a slight vacuum in the pool room (the air flow of the exhaust system should be 10-15% higher than that of the supply system). This prevents moist air and odors from the pool from spreading to other rooms.
• Air mobility. Unlike residential premises, where ventilation can be turned off for some time, in the pool room constant air movement must be ensured based on a 6-fold air exchange. This is due to the fact that in still air, even with normal average humidity, stagnant zones form near cold surfaces, where the temperature drops below the dew point and condensation occurs. To avoid this, the air must be constantly mixed. In winter, such an amount of outside air is usually not required to assimilate moisture, so to ensure the necessary mobility, a ventilation unit with a mixing chamber is used (in which outside and inside air are mixed in a given proportion and supplied to the room). We also note that when choosing the location of the air distributors, it is necessary to take into account that the air flow should pass along cold surfaces (usually vertically along the windows), but there should be no drafts in the swimming area, since this not only creates discomfort for pool visitors, but also significantly enhances moisture evaporation.

More details about the parameters of the air environment and the rules for designing ventilation systems in a swimming pool can be found in the already mentioned recommendations of ABOK 7.5-2012.

Choosing a pool ventilation system

To ventilate a swimming pool, you can successfully use ventilation units of various configurations, the cost of which can vary several times. The simplest and most inexpensive option is a conventional supply unit and an exhaust fan synchronized with it in rotation speed. Humidity is reduced by an autonomous dehumidifier (in summer, moisture assimilation by outside air is not always possible). The disadvantage of such a system is high energy consumption, for example, for a pool with a water surface area of ​​20 m², an air flow of 600-800 m³/h will be required, which will mean consumption of about 13 kWh in winter. Modern specialized air handling units can reduce energy consumption several times, but such a ventilation system will be more expensive. Energy saving is ensured not only by multi-stage recuperation systems (several cascades of a plate recuperator + heat pump / dehumidifier), but also by flexible system settings depending on the outside air parameters and the selected operating mode. Even with relatively low gas and electricity tariffs, the cost of ownership (initial costs + operation) of a modern supply and exhaust ventilation system will most likely be lower than an inexpensive direct-flow system. Note that the cost of the ventilation unit may increase due to additional functions, such as cooling the air or heating the pool water with excess heat generated when the refrigeration machine operates in dehumidification mode.

Can conventional ventilation units be used to ventilate a swimming pool? If this is a supply system into which only outside air enters, then there is not much difference. However, air handling units and air handling units with a mixing chamber must have anti-corrosion protection for heat exchangers, since the transportation of warm and humid air can lead to corrosion of untreated metal surfaces. So, for example, a plate heat exchanger must be made of an inert material such as polypropylene, but if a traditional aluminum heat exchanger is used, then it, like other heat exchangers (water heater, evaporator, condenser) must have special anti-corrosion protection.

Operating modes of the ventilation unit

In modern specialized air handling units with a digital automation system, all operating modes are configured once during commissioning. The user does not need to change anything in the system settings in the future: to control it, he will only need to switch the operating and standby modes of operation (this can be done either from the remote control or using a regular switch for these purposes).

If a ventilation unit with a simplified automation system or a model not intended for these purposes is used to ventilate the pool, then the user will have to independently control the fan speed and operating mode of the heater, set the air humidity depending on the season, and change other settings. And such a ventilation system, due to non-optimal settings, most likely will not allow maintaining a comfortable microclimate with the lowest possible energy consumption.

Specialized models of air handling units for swimming pools operate in two main modes:

• Work mode(may also be called Day Mode). In this mode, the ventilation unit operates during the operation of the pool, when there are people in the room, while a specified amount of outside air is constantly supplied to the room (not lower than the sanitary standard). Dehumidification can be carried out both by assimilation of moisture with outside air, and by a combined method (assimilation + condensation dehumidification of air). In the second case, energy consumption will be lower.
• Standby mode(may also be called Night mode). In this mode, the ventilation unit operates when there are no people in the room. Outside air is not supplied to the room, the ventilation unit operates in recirculation mode (this allows you to save energy without wasting it on heating the outside air). At the same time, the automation constantly monitors air humidity and, when it rises above a predetermined level, turns on the refrigeration circuit compressor for condensation dehumidification (if the ventilation unit has a dehumidifier), or supplies outside air to assimilate moisture (if there is no dehumidifier). The ventilation unit can have a customizable ventilation mode in Standby mode - once a day, fresh air is briefly supplied to the room so that unpleasant odors do not accumulate there.

Some models have emergency mode work. If a malfunction of the built-in or stand-alone dehumidifier occurs and the air humidity rises above a critical level, the supply of outside air is increased to assimilate the moisture.

You can find out more about each operating mode and equipment features in the documentation on the manufacturers’ websites.

Options for technical solutions for pool ventilation

Above, we have already briefly discussed the differences between conventional ventilation units and specialized models designed for organizing pool ventilation. Now we will take a closer look at the technical solutions used in practice based on various equipment.

1. Supply and exhaust unit, autonomous air dryer.

This is one of the simplest and most inexpensive options. Supply and exhaust systems maintain the required fresh air flow in the room according to sanitary standards, and also provide the required vacuum. Air humidity is maintained by a separate (autonomous) wall-mounted dehumidifier, which also creates the necessary air mobility: the dehumidifier fan runs continuously, and the compressor is turned on by command from the hygrostat when the air humidity exceeds a set value. In Standby mode, ventilation is not needed and should be turned off to save energy.

If in the region where the pool is located, the outdoor air temperature can exceed the indoor air temperature for a long time, then you will need to use an air-intake unit with a freon cooler, working in conjunction with the KKB.

The advantage of the considered option is only the possibility of using common non-specialized equipment. It has many disadvantages:

• Inconvenient control: you need to set parameters on two independent systems (ventilation and dehumidifier).
• A wall-mounted dehumidifier located in a pool room detracts from the design of the room and makes a lot of noise when the compressor is running.
• There are problems with organizing uniform air distribution throughout the pool room, because air mobility is ensured by a flow coming from one point (a wall-mounted dehumidifier does not allow connecting air ducts to it to distribute the air flow).
• High energy consumption due to lack of heat recovery.

It should be noted that before the advent of wall-mounted dehumidifiers, humidity reduction was carried out only through the assimilation of moisture by the outside air: in swimming pools, the system described here was used, only without a dehumidifier. A serious drawback of such a system was the need to ensure air mobility with supply air, which led to colossal energy losses during the cold season. If you reduce the performance of the air handling unit to the sanitary standard, then there is a high risk of condensation appearing on the windows and in the corners of the room where the air is poorly mixed. Below, in the table with the results of energy consumption calculations, the option without a dehumidifier is shown as number 0 to demonstrate the economic infeasibility of such a solution.

Is it possible to do without an expensive dehumidifier if climatic conditions allow moisture to be assimilated by the supply air? Yes, for this it is enough to use an air supply unit with a mixing chamber, as in the following option.

2. Supply unit with mixing chamber, exhaust unit, autonomous air dryer.

If you equip the supply unit with a mixing chamber, where outside and recirculated air will be mixed in a given proportion, then the required air mobility can be ensured by the ventilation system, and a dehumidifier will only be needed to reduce air humidity in the summer, when the moisture content of outside air becomes too high. This way we got rid of the problem with uniform air distribution: a mixture of supply and recirculation air is supplied through distributors located throughout the room.

If in the region where the pool is located there are no periods (or they are very short) when the high moisture content of the outside air does not allow reducing air humidity by assimilation, then a dehumidifier may not be installed. This will significantly reduce the overall cost of the system. And on those days when it is too hot and humid outside, you simply should not use the pool (the surface of the water should be covered with a film to reduce moisture evaporation).

3. Duct air dryer with a mixture of outside air, exhaust unit.

The reason for most of the shortcomings of the first two options was the use of a stand-alone dehumidifier. If instead you install a duct dehumidifier with a heater and the possibility of mixing in outside air, then you can dispense with the supply unit: all processing of the supply air will take place in the duct dehumidifier. This option can already be recommended for use in small private pools, since the cost is approximately the same as the first two options, but it does not have all their disadvantages, except for high energy consumption, which remains exactly the same. Indeed, the entire system is controlled from one remote control, and noise from the equipment will not be heard if the dehumidifier is located in a separate room.

4. PVU with dehumidifier/heat pump.

If we combine the duct dehumidifier from the previous version with an exhaust unit, we will get a supply and exhaust unit with a dehumidifier that can work as a heat pump, giving approximately a 3-fold gain in energy consumption. This opportunity arises when the dryer condenser is placed in the exhaust duct, and the evaporator in the supply duct. The flow of warm air heats the condenser, the compressor transfers the heat to the evaporator, which heats the supply air. In this case, dehumidification still works: when moist air is cooled, moisture condenses on the evaporator (you can read more about the operation of the refrigeration machine in the section)

Another important advantage is the use of one unit to treat both supply and exhaust flow. This not only makes it easier to balance the speeds of the supply and exhaust fans to maintain the required vacuum, but also allows you to flexibly change the operating modes of all components to achieve maximum comfort and energy efficiency. The PVU usually implements the possibility of scenario control, when operating modes are switched by a timer; ventilation, cascade control and other modes are supported. In addition, it is optionally possible to use a refrigeration machine to cool the supply air.

5. PSU with recuperator and dehumidifier/heat pump.

The previous option is almost ideal, but to heat the air, a heat pump is used, which requires electricity to operate. And in most regions of Russia, heating with gas is several times more profitable than heating with electricity. If to obtain a certain amount of heat when using a gas boiler you need to pay 3-4 times less than when using an electric heater, then the advantage of the heat pump is lost and it becomes more economical to heat the air with a water heater (the heat pump produces 2 to 5 times more heat, than consumes electricity, the exact value depends on the equipment used and the outside temperature - the lower it is, the lower the COP). In this case, we recommend using a PVU with a plate recuperator, which saves heat and does not consume electricity. And the dehumidifier compressor turns on only when it is necessary to reduce the humidity of the air or cool it.

Note that if the pool is located in a region with a cold climate, where in the summer it is possible to effectively dry the air by assimilating moisture, then the dehumidifier becomes unnecessary and can be abandoned to reduce the cost of the system. Then it would be optimal to use a specialized PVU with a plate recuperator without a dryer.

Specialized PVUs are usually equipped with all the necessary sensors to monitor the state of the environment, which allows them to maintain specified air parameters with maximum energy efficiency. As part of this review, we cannot talk in detail about all the capabilities of the PES for swimming pools, but this information is available in the documentation on the manufacturers’ websites.

Summary table with the advantages and disadvantages of various technical solutions

Calculation of energy consumption of various technical solutions

When describing all the options, we talked about energy efficiency - one of the most important indicators of a pool ventilation system. For clarity, we determined the energy consumption for each option in winter using the example of a small private pool with a water surface area of ​​14 m² and compiled this data into a table. We calculated the required power to heat the outside air to a given temperature, as well as the total power, which includes the power of the pool heating system (total power is determined by the temperature and humidity of the exhaust air). The difference between these two parameters is explained by the fact that the supplied air has practically zero moisture content, so first (inside the ventilation unit) energy is spent on heating dry air, and then on humidifying it in the process of evaporating water from the pool (energy comes from the water heating and heating system ). Note that ventilation usually operates in the mode of maintaining a given temperature at the outlet of the supply channel (calculations were carried out for this option). However, the ventilation system can perform the heating function and operate in the mode of maintaining the set temperature in the room (cascade control mode), then the power consumed for heating will be higher than indicated in the table, but the total power will not change. The table also shows the total power for standby mode when the pool is not in use.

So, the initial data:

• Air consumption to organize the required air mobility: 700 m³/h.
• Air flow according to sanitary standards (2 people): 160 m³/h.
• Required dryer capacity: 2 kg/h.
• Indoor air temperature and humidity: 30°C and 45%.
• Outdoor temperature and humidity (for Moscow): -28°C and 84%.
• The surface of the water is covered with a film when the pool is not in use.

Table with the results of calculating the required power for various technical solutions

Regions with cold and hot climates

In regions with very cold or hot and humid climates, additional options may be required to ensure efficient operation of the equipment:

• If the air temperature drops below -20°C for a long time, an additional preheater may be required.
• Where it is hot and humid in summer, for example in Sochi, options for cooling the supply air will be useful. For these purposes, various technical solutions can be used: a cooler with an external CCU, a dryer (refrigeration machine) with a remote condenser, and others.

Air handling unit
with heat pump (dehumidifier)

To ventilate pool rooms, both specialized equipment and conventional air handling units are used. In the second case, it is possible to significantly reduce the cost of the system, but operating a pool without a dehumidifier is risky, since the condensation that falls can damage the finishing of the room.

An inexpensive system can be assembled according to option No. 2: supply unit + mixing chamber, exhaust unit and, optionally, an autonomous air dryer. This system can be installed in stages: first install the ventilation system, and then, after the start of operation, decide whether a dehumidifier is needed. The supply unit can be of any type, but it is better to use a model with a built-in mixing chamber and an adjustable mixture of outside air, for example, Breezart Pool Mix. Choosing an autonomous dehumidifier is not difficult; popular brands include: DanVex, Dantherm, Cotes, Microwell.

If you are determined to use an air dehumidifier, then instead of the previous solution it is better to choose option No. 3 based on a duct dehumidifier - this will already be a specialized model with an admixture of outside air, intended for use in pool rooms. Duct dehumidifiers for swimming pools are produced Dantherm(CDP series), Calorex(Variheat series), Breezart(Pool DH series), Aerial and others.

When deciding to build a swimming pool, it is necessary to take into account all the factors that influence a comfortable stay in the room. To correctly calculate the pool ventilation systems, you will need to study all the equipment and structures in the complex. Namely: the area of ​​the mirror, the location of water treatment systems, door and window openings, the type of bowl (skimmer, overflow, etc.), the design of the room (wood, concrete, brick), the presence of adjacent rooms (bath, sauna, hammam, etc.), the presence of a basement for supplying fresh air, the presence of a drainage system, etc.

Proper calculation of the ventilation system, installation of the necessary equipment, adjustment of its functioning is an important factor influencing the creation of a comfortable microclimate in the room. Lack of attention to these details leads to unpleasant consequences.

An example of water treatment for an overflow pool

Pool microclimate

Pool ventilation is an extremely important factor in creating a microclimate that is comfortable for humans. The lack of a high-quality ventilation system leads to the rapid spread of fungus and mold, and the accumulation of a large number of microorganisms in the air leads to the occurrence of various diseases.

High humidity in an enclosed pool area leads to corrosion of metal structures, rotting of wooden structures, and destruction of finishes and walls by fungus.

The humidity in the pool room should be at the level of 50–60%; in this case, a moderate level of moisture evaporation from the surface of the water is achieved, which affects the comfort conditions in the room. At a given humidity and air temperature of 28-30 °C (characteristic temperature for swimming pool premises), dew will form at 16-21 °C. This is noticeably higher than for ordinary rooms, in which the air temperature is 24 °C, humidity is 50%, and the dew point is 13 °C. For swimming pool premises, excess moisture content in the air is considered normal.

• The water in the pool is within 24–28 °C.
• The air in the pool room should be 2–3 °C higher than the water temperature. When the air temperature drops, there is a risk of catching a cold. As humidity increases, you may feel stuffy. It is also not recommended to reduce the air temperature at night in order to save energy, as heat consumption increases.
• To avoid drafts, the recommended air speed should be in the range of 0.15–0.3 m/s.

All these and many other conditions are taken into account during the design, and solutions are proposed to reduce moisture condensation on the ceiling and walls. The complexity of the situation is that when people, for example, do not use the pool at night, the heat and humidity do not disappear. The pool cannot be “turned off” at night. The only way to reduce the amount of evaporation is to use water surface covers, but these devices are short-lived and rarely used.

When the humidity level reaches 80–90% at a temperature of 29–30 °C, there is a risk of exacerbation of chronic diseases and a sharp deterioration in well-being. Therefore, with a correctly calculated and designed ventilation scheme for a private pool, excess moisture is removed from the air, it is cleaned due to intensive air exchange, but does not dry out.

Air is dehumidified to the required parameters by dehumidifiers, according to moisture release parameters. Dehumidifiers can be monoblock and built into the ventilation system (at ).

An example of calculating the evaporation of water from a swimming pool per day

Initial data:

• Mirror size 4.2 × 14 m.
• room temperature +28 °C;
• pool water temperature +26 °C;
• relative humidity 60%.

1. The surface area of ​​the pool is 58.8 m².
2. The pool is used for swimming 1.5 hours a day.
3. The evaporation of water during swimming will be 270 grams/m²/hour x 58.8 m² x 1.5 hours = 23,814 grams.
4. Evaporation at rest for the remaining 22.5 hours will be 20 grams/m²/h x 58.8 m² x 22.5 hours = 26,460 grams.
5. Total per day: 23,814 grams + 26,460 grams /1,000 = 50.28 kilograms of water per day.

Ventilation design rules

The ventilation system installed in the pool must be autonomous and independent of the ventilation of the rest of the house. If the ventilation of a house must ensure the flow of fresh air and the removal of waste air masses, then the ventilation of swimming pools, in addition to these functions, must maintain the relative humidity of the atmosphere within the established standards.

A classic option for ventilating a swimming pool in a private house with a small mirror

When constructing a pool, the project is developed individually. The main requirement is to ensure the safety and comfortable stay of people indoors.

In order for swimming pool ventilation units to work effectively, it is necessary to design their installation taking into account:

• Size of the room.
• Number of people using the pool.
• The area of ​​the water surface of the pool.
• Air and water temperature requirements.
• The rate of evaporation of water, which depends on its temperature. The warmer the water, the faster it evaporates.

Taking into account these parameters, the appropriate supply and exhaust ventilation power for the pool is selected. If the equipment is chosen incorrectly, this will lead to an imbalance in air humidity and temperature. This will contribute to condensation settling and creating an unfavorable atmosphere for human health.

Pool ventilation diagram

The calculation of ventilation in the pool is carried out taking into account two features:

1. Heated moist air currents rush upward.
2. Condensation settles on all cool and damp surfaces.

Ventilation equipment can be installed in any convenient way: on the walls, on top of the pool, under its bowl or around it. Often, supply ventilation is located around the pool or on both sides so that the exhaust air rises faster to the hood.

The exhaust unit must operate so that the volume of air it removes is equal to the volume of supply air masses. Thanks to this functioning, there will be no drafts that disturb the comfortable microclimate. It is recommended to install supply ventilation under the windows; air is supplied from the basement through slotted floor grilles. This placement of ventilation ducts will prevent the formation of condensation on the glass. Exhaust ventilation ducts are mounted in the middle of the mirror under the ceiling where moisture and heat collect, not getting close to the inflow, so that the recirculation of air masses is more efficient.

Example of a pool ventilation project

Ventilation calculation

To design the right ventilation system, professionals recommend dividing the installation process into several stages:

1. Selection of equipment and materials for installation of the ventilation system. At this stage, you should decide on the choice of a good specialist who will perform the work.
2. Creation of a working draft, design of a circuit for installation with the installation of the necessary technological holes.
3. Creation of as-built documentation, including drawings and instructions for installed equipment.

Determination of ventilation performance and air heater power depending on the surface area of ​​the pool

Here's an example of how to calculate pool ventilation:

• The initial data is taken from the temperature of the working area of ​​the room, the water in the pool bowl, the humidity level, the area of ​​the bowl, as well as the average daily temperature and air humidity.
• The air exchange is calculated for the number of people using the room. The air exchange rate is calculated using the formula: the evaporation rate is divided by the specific density of the air, which is multiplied by the difference in air humidity outside and inside the room. For 1 person it is 80 m³/h, therefore for 10 users this figure will be 800 m³/h.
• The supply air flow rate is determined to maintain the optimal humidity level (for example, in the initial data it is 60%). It is compared with the air exchange rate presented above. The larger of these values ​​is selected.
• The level of heat gain and loss is determined. Heat comes from lighting, swimmers inside the room, adjacent rooms (bath, sauna, hammam), the density of bypass paths, door and window openings. Heat loss occurs when the reservoir heats up.
• Then the amount of evaporation from the surface of the reservoir is calculated. The evaporation coefficient is determined.

Having calculated all the indicators, we can conclude how many degrees the incoming air should be cooled or heated in order to maintain a balance with the temperature inside the room.

Optimal humidity level

A comfortable level of air humidity in the pool should not exceed 65%. To reduce humidity to the optimal level, you can use a dehumidifier, forced-air ventilation, or both. Two methods are used to dry air: condensation and assimilation:

1. Condensation is a method in which air is passed through a dehumidifier where its temperature reaches its dew point. After moisture condenses, the air warms up and returns to the room. In this case, thermal insulation of all air ducts is necessary to prevent condensation from draining inside the room. Often, the pool ventilation in a cottage with such an installation is equipped with a hygrostat, which starts the compressor when the humidity reaches a certain level. When the humidity drops, the compressor automatically switches off. The fan continues to work. Condensation dehumidifiers come in three types: wall-mounted, concealed, and stationary. The latter type requires a separate room or is built into the supply and exhaust system.
2. The operation of supply and exhaust devices according to the principle of assimilation is based on the ability of air to absorb water vapor. The advantage of the assimilation method is that it effectively purifies the air, but there are two disadvantages. The first is related to dependence on the weather: with a high level of atmospheric humidity, the air entering the pool room does not absorb moisture. The second disadvantage is that the supply air must be heated.

The rate of water evaporation from the pool surface (liters/square meter per hour)

Experts consider the best option for maintaining the required level of humidity in the pool room to be a combined dehumidification method using forced installation and a dehumidifier. However, this method is effective only for small bowl volumes, and requires careful calculation, otherwise problems may arise in resolving the issue (equipment failure, inexperienced connection of the system, etc.).

Ways to maintain optimal air temperature

The air temperature in the pool should be higher than atmospheric. Heating systems are often used for this: the supply air is heated to a temperature that is maintained by the heating system using appropriate sensors, which increases the cost of the project. This method is best used as an additional method to the main heating system. The most effective way to maintain optimal air temperature in the pool is a supply and exhaust system with a heat recuperator. It takes heat from the exhaust air (35–40%) and transfers it to the cold supply air through filtered systems. It must be remembered that the heat of the return air is not enough, and in any case it is necessary to install additional heating (electric heater, water heater).

To summarize, it should be noted: to create a favorable microclimate inside the pool, it is necessary to carry out a complex process of calculations, design, and installation of ventilation systems. But the efficiency of the ventilation system is influenced by many factors, between which a certain balance must be maintained, corresponding to the standards of air exchange, optimal humidity levels, and air temperature.

This process requires a professional approach to the ventilation system for rooms with a swimming pool:

• The supply and exhaust ventilation rate is calculated based on specific individual conditions.
• The air dehumidifier is selected according to the parameters indicated above.
• The presence of a specialist is required.