Application Swimming pools

Even with the best possible water treatment in swimming pools, nuisance byproducts are almost always released from the water surface. Removing these byproducts by ventilation with sufficient fresh outside air is necessary to achieve healthy air quality. New laws and regulations set tough requirements for air quality. This requires annual measurement of the amount of trichloramine in the air at the most critical location. Proper air distribution and flushing in the swimming hall are also necessary for good air quality.

To create a comfortable climate in the swimming hall, the air temperature in combination with the Relative Humidity is an important factor. A room air condition that is too dry (low RH) feels "cold" to the swimmer. This is because the moisture present on the swimmer's skin evaporates too quickly, drawing heat from the body. In contrast, a room air condition that is too humid (high RH) is experienced as stuffy and hot, because evaporation is too slow and the body is then less able to be cooled by sweating.

 

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Ventilation requirements with fresh outside air

When people talk about ventilation requirements in swimming pools, they often discuss terms such as circulation rate and ventilation rate. The circulation rate is the number of times per hour the room is flushed with air. This should match the chosen air distribution system (air supply grilles) that has a minimum and maximum flow rate. If the air volume over the diffusers is too low, the throw becomes too small and the flushing of the room insufficient. If the air volume over the diffusers is too high, the air velocities in the swimming hall become too high (draft risk) and noise complaints may occur. Ventilation rate is the number of times per hour that the room is flushed with fresh outside air.

Humidity

For a given use of the pool water and a given water quality, the air quality depends on the amount of outside air and any play elements in use such as slides, waterfalls, rapids and hot tubs. This outdoor air is also used to control humidity at approximately 50%. There are two main reasons for controlling humidity:

the comfort of staff and users
preventing condensation and corrosion damage to the building and installations

Evaporation of pool water releases moisture into the room air. This causes the relative humidity to rise if the amount of ventilation air is not sufficient. To maintain the relative humidity at the desired level, the room must be ventilated with drier outside air. The difference between the absolute moisture content (g water vapor per kg of air) in the outside air and the inside air determines the amount of outside air needed at that time. All moisture evaporating from the bathwater basin must therefore be removed by ventilation.

Amount of water vapor

The amount of moisture that evaporates from the bath depends on the occupancy of the bath, the water temperature and air conditions, the water surface and the intensity with which water and air come into contact (slide, waterfall or bubble bath). Thus, at the given design conditions and equal occupancy of the bath, the amount of water vapor to be discharged is always a constant.

Among other things, this quantity can be calculated using the methodology from the German VDI 2089 Guideline. This guideline (not a standard) was created by the Verein Deutscher Ingenieure. It allows you to calculate how much water vapor you need to remove by ventilating with the in absolute sense drier outside air and thus regulating the humidity in the swimming hall. The capacity of air conditioning systems is determined in this way. There are also other calculation methods available such as ASHRAE but the VDI 2089 is often used.

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