Fundamentals of calculating the ventilation system
The calculation of the ventilation of pools includes the determination of the flow of air masses. Air exchange is determined from tables using known temperature and water area.
When calculating the ventilation system, the following parameters are taken into account:
- water area;
- the area of the entire room;
- track area;
- outdoor air temperature;
- temperature of the atmosphere in the room;
- water temperature;
- the number of people visiting the pool;
-
heat input;
- entry of moisture into the atmosphere.
The ventilation of the private pool is designed based on these data. For the summer period, more powerful equipment can be added to lower the temperature of the incoming atmosphere, and, conversely, to heat up in the winter.
The ventilation of the pools is calculated in such a way that the pressure in the living room is excessive relative to the entire room. This is done so that the air from the pool does not enter the residential part of the house.
Ways to reduce humidity in the pool room
Reducing air humidity can be carried out in two ways:
- condensation;
- assimilation.
Moisture condensation in the pool
Moisture Condensation Diagram
The air is forced through the dryer where it reaches its dew point temperature. Moisture condenses, after which the air is heated to the desired temperature and returned to the room.
Such installations are good for ventilating a pool in a cottage, where it is impossible to implement an inflow-blowing system. The design is equipped with a hygrostat, which starts the compressor when the humidity reaches a certain reading. As soon as the humidity drops, the hygrostat stops the compressor. The fan may continue to rotate.
Condensing type dryers are:
Wall-mounted, which are hung on the walls. They can be installed in a pre-finished room;
Wall hidden. All the equipment is hidden in the adjoining room, only the fence grate goes into the pool room. It is necessary to plan such a pool ventilation system in a private house at the construction stage;
Stationary. These are powerful installations that require a special room. They can be included in the supply and exhaust ventilation system for the swimming pool of the sports complex. The stationary dehumidifier allows mixing 1/5 of the air volume. Air supply and exhaust are provided by a system of air channels. Having equipped the system with a duct heater, we get full ventilation.
Assimilation of moisture in the pool
Scheme of moisture assimilation
Supply and exhaust systems work according to this principle, using the property of air to absorb water vapor. With approximate calculations, a 5-fold air exchange per hour is laid.
Often, in temperate latitudes, only ventilation is enough to maintain the necessary microclimate in a small private pool. But when calculating the ventilation of the pools of sports or entertainment complexes, a dehumidifier is indispensable. Especially if they are located in places with a hot climate.
The second significant drawback is that the supply air must be heated. This is especially noticeable in the cold season, when a maximum of electricity is spent on heating.
Combined Pool Dehumidification Method
Combined dehumidification system
Optimal type of dehumidification and ventilation installation for pools with intensive use and large areas. Experts recommend using both a dehumidifier and forced ventilation. Systems can be independent, not connected in any way, or form a common microclimate maintenance system.
This is expensive equipment that justifies itself only in pools with an area of at least 50 square meters. meters.
Organization of supply and exhaust ventilation of the pool room
And now, finally, we come to the realization of the need to equip all the same supply and exhaust ventilation of pools. Supply and exhaust ventilation can also be organized in different ways - these can be two separate ventilation units (supply and exhaust), for example VEZA VEROSA, each of which performs its own work. However, it would be most expedient to combine both of these installations into one and thereby save on installation space. VEZA product range includes specialized units for ventilation of AKVARIS swimming pools. These installations, along with providing a comfortable microclimate in the pool, also allow you to significantly save on heating the supply air, due to such built-in equipment as recuperators, heat pumps.
The use of a supply and exhaust unit gives the customer the opportunity to get full air exchange in the pool room
It is very important to observe a negative imbalance in the room when setting up the operation of the installation. This means that the amount of air removed from the pool room should be slightly greater than the amount of air supplied to the same room.
Existing standards (SP 31-113-2004) tell us that the volume of exhaust air should be greater than the supply air by no more than half the ventilated volume of the room (0.5 times)
Next, you should also pay attention to the speed of the air. So, in order to avoid discomfort, drafts and intensification of moisture evaporation, in the bathing area and above the water surface, the air speed should be at the level of 0.15 ÷ 0.20 m / s
To prevent aerodynamic noise from the air at the outlet of the air distribution grilles, an airflow velocity of the order of 2÷3 m/s should be observed.
Ventilation requirements for indoor pools
It can be said that a mechanical ventilation rate of 1 ACH (one complete change of air per hour) in a pool will be sufficient to maintain a reasonable level of relative humidity when the room is not regularly used. In heavily used pools, the air exchange system must be able to supply 2 ACH to maintain good air quality.
Ventilation requirements for indoor pools
When calculating optimal ventilation, it is taken into account that the evaporation rate is enhanced by factors:
- Large water surface. Therefore, covering the pool with a material that prevents the evaporation of water leads to a decrease in the amount of evaporated water;
- High water temperature;
- Low air temperature;
- Low relative air humidity;
- Intensive air movement over the pool area.
