Swimming pool – Montreuil
Study of aerodynamic and condensation phenomena in a swimming pool
This study is carried out for the pool areas of a swimming pool. The CFD model studied incorporates the air volumes of the pool hall and the walls in contact with the outside.
Swimming pool - Montreuil
Year
2023
Customer
NC
Location
France
Typology
Climate Engineering
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Study of air diffusion in a swimming pool undergoing renovation
Condensation in swimming pools is a natural phenomenon that occurs when warm, humid air comes into contact with a cold surface. When the moisture combines with the warm air, it cools, causing a drop in temperature that leads to condensation. The walls, partitions, and surfaces of swimming pools are generally cooler than the surrounding air, allowing them to cool the humid air and cause condensation.
This space is characterized by a warm and humid environment (around 27°C-28°C and 60-65% RH), with water evaporation and condensation phenomena influencing heat transfer and occupant comfort.
Infrared camera inspection of the swimming pool
Our experienced EOLIOS engineers conducted a preliminary on-site audit before carrying out a CFD study of the entire building in order to highlight the various problems the site is experiencing.
3D modeling of the existing structure
Modeling of real air diffusion systems using CFD
Initial CFD simulations of external airflow have highlighted several interesting phenomena that could increase wind power potential . Restricting the cross-section of the wind passage behind the building creates a Venturi effect , thus increasing the local wind speed.
Following this study, Eolios was able to propose different designs while respecting the various architectural challenges. These findings led to in-depth work with the design teams to maximize and capitalize on this local speed increase .
Principle of blowing in the pool hall
The air temperature control of the swimming pool is ensured by the HVAC (heating, ventilation and air conditioning) system .
The distribution of flow rates is carried out according to the DOE HVAC, identifying each supply point individually and associating it with a diffusion flow rate.
In our study, we assume that the supply nozzles have been balanced. In this context, the flow rate is fixed individually from each supply nozzle, and the air transfer ducts are not included in the model (except for the consideration of the air mask within the air volume).
Precise integration of broadcasting systems
Most of the air is supplied via floor grilles along the curtain walls. All existing supply points are maintained and integrated into the CFD study model.
Air is distributed via supply grilles along the curtain walls.
Most of the air is blown in via floor grilles along the curtain walls. All existing blowing points are maintained and integrated into the CFD study model . Complex to understand, it represents air movements throughout the dock hall.
The following current tube distribution allows us to understand the air movements taking place from the diffusion grilles of the facades .
Principle of blowing in the pool hall
Study of the average age of air
In our various studies, EOLIOS engineers have created different scenarios in order to guarantee and promote different solutions that meet the client’s needs.
In this study excerpt, we have integrated a total additional diffusion of 20,000 m3/h, i.e. two diffusing ducts under roofs (10,000 m3/h unit).
This extract will deal with the example involving the addition of directional nozzles .
Study of the average age of air
The average age of the air is the characteristic average time that the air spends in the volume considered between the moment it is supplied by the diffusion systems and the moment it is taken back by the air extraction systems.
Surface condensation analysis
Convective heat exchange through walls is linked to the surface air velocity, which drives heat exchange. Indeed, the surface temperature of a wall with air circulation will be closer to the room’s internal temperature than that of a wall with very little air circulation in a dead zone , whose temperature will tend towards the outside temperature .
For both facades, an air layer warms the glazing surface along the wall; this is linked to diffusion via air banks to directly treat the facade.
The diffusion system appears designed to combat the effects of cold walls and the formation of condensation on facades. However, in winter conditions, for temperatures< At 5°C, traces of condensation may appear in the roof area. Therefore, for facades, the diffusion ensures that , even at -7°C outside temperatures , a strip at eye level is always effectively treated.
Engineers have determined that the areas most prone to condensation are those where the surface layer is poorly circulated and in contact with a lightly insulated wall. These areas typically appear behind ventilation barriers (beams, posts, studs, etc.). At an outside temperature of -7°C, the roof reveals large areas conducive to condensation.
Video summary of the study
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