Pool dehumidification

Airpool +

Heated indoor pools are prone to the phenomenon of evaporation, whereby the pool water evaporated increases the humidity of the air. It is therefore essential to use dehumidifiers that treat the air and control its properties to keep it in top condition

Humidity-saturated air

The density of humid air is lower than that of dry air under the same pressure and temperature conditions. Cold air is denser than dry air, so in a place where no air flows cold, dry air will sink to the bottom and warm, humid air will rise to the top.


Air conditioning in premises with very high ceilings, i.e., more than 4 metres high, must be thought about carefully to favour or counter the accumulation of warm air that rises to the top. If there is only a heating system, the stratification must be displaced – either by diffusing or mixing it, which tends to make temperatures at the upper level even – by using diffusers with a built-in fan that draw in warm air and then expel it or by distributing the air through secondary piping whose function is to direct the main air flow in an occupied space.


When moist air comes into contact with a colder surface, it cools, reaches saturation point (100% humidity) and condenses the moisture. This can be avoided through insulation or by letting warm, dry air flow into such areas.

Airpool +

The high-performance Airpool+ dehumidifier is used for the dehumidification of indoor pools.
Made using innovative technology, it includes a new distribution of the cooling circuit’s components and a high-performance recuperator, which together make considerable energy savings in comparison with the conventional technologies that can be found in the market.

Users can set the times the unit works. In night-time mode, conditions are less restrictive as there is nobody in the pool, so settings are read to dehumidify it but not to regulate air quality.

The unit also comes with a free cooling system, which is able to renew air so that users breathe in the best quality of air possible and to take advantage of outdoor conditions for dehumidifying, thus reducing the unit’s consumption. This free cooling system regulates itself according to relative outdoor and indoor humidity, and the default value.

The unit has a hot water battery and its three-way valve is regulated depending on the return temperature to make up for heat losses from a pool.

Operating modes

The Airpool + dehumidifier adjusts the conditions of an indoor pool to those desired by the user in its two operating modes: daytime (peak time) and night-time. The regulation and recovery of heat in these two operating times make this dehumidifier a high-performance unit.

Mode 1. Recirculation

This operating mode is for night-time only. The return flow rate fulfils all night-time default conditions required, so the cooling cycle does not have to be switched on and all of the water is recirculated. Users can set the fan speed to keep power consumption and noise down to a minimum.

Mode 2. Alpha cycle

The return conditions measured show that the pool should be dehumidified, so the cooling cycle starts up without any outdoor air being fed into it. This operating mode can only be run at night-time.

As is the case of mode 1, the heater will only start up if the desired return temperature behind the condenser unit has not been reached..

Modo 3. Outdoor air

In this operating mode, the unit is able to reach the desired return conditions thanks to the regulation of the weir flaps. As the flow rate of outdoor air very often results in energy savings, outdoor conditions help bring down the humidity in the pool area and just a small inflow of heat can be enough to reach the desired temperature if the set return temperature has not been reached.

Mode 4. Alpha cycle + Outdoor air

This operating should be used when the inflow of outdoor air is unable to reach the desired conditions. This does not mean that the weir flaps on the free cooling system close to keep the flow rate to a minimum, as the regulation system used ensures that the flaps open to the optimum position to make the most of the outdoor air.

The unit will run in mode 4 when the inflow of outdoor air is unable to reach the desired conditions. The unit will ensure there is the minimum inflow of outdoor air to run properly.

Mode 5. Cooling

Without exterior condenser or water condenser. The unit’s free cooling system will endeavour to reach the conditions selected by the user as well as keeping to indoor air quality (IAQ) standards. The by-pass valve on the recuperator is used to make the most of outdoor conditions.

With exterior condenser. This optional feature is recommended for facilities in areas with high humidity and high temperatures. It expels excess heat outdoors and feeds cool, dry air into the pool.
As this feature is built into the unit, no additional installation is required.

With water condenser. When temperatures in a pool facility rise above the default temperature, warm air will no longer be fed into it. However, it may still be necessary to dehumidify the air, but as the outdoor air cannot be used to do so the cooling cycle will start to run and instead of condensing the air, both the air and water will be condensed.