Thermal Gain Pool Covers Ref: Thermal 5mm
Closed cell polyethelene foam with a laminated top and embossed base. All covers are heat sealed. This pool cover is also great for spas. The cover simply floats on the water.We can make covers to suit you from spa sized to Olympic sized swimming pools. We can also supply and fit motorised systems.
Why We need Pool Covers in Public Swimming Pools The causes of energy losses in heated public swimming pools vary, so I will try and establish where the heat is lost and in what quantities. The heat lost through the wall of the pool is mainly incurred in the heating up period. Once the surrounding ground is heated then the loss through the walls are negligible, however if the pool has an abundance of ground water or high water table. The heat can be dissipated by the ground water and this can be considerable, but it can be corrected by placing an insulation material on the walls when in construction. Further losses occur when:- - Adding fresh water
- Back washing
- Hygenic reasons
- Evaporation
- Splashing during bathing
Non of which is avoidable - Radiation
- This the difference in air temperature and water temperature
It is here that the energy losses can be greatly reduced by an insulating cover - Convection
- This happens through the heat exchanged between the water surface and air passing over it.
Again this is greatly reduced by having an insulated cover By far the greatest loss is the result of evaporation of water at the surface, where air and water temperature and relative humidity are the decisive factors. The energy loss through evaporation amounts to 0.62 kwh per kilogram of evaporated water. Evaporation losses can avoided with the simple solution of installing a wvb (water vapour barrier). If this barrier also has some insulation included in its construction then you will see some dramatic benefits.. As shown in practice swimming pool covers can achieve significant energy savings. User experience indicates up to 70%. It must be pointed out that the benefits are dependant on the operator who must ensure that the pool is systematically covered outside of bathing hours. With the use of a pool cover saving evaporation you will also reduce your consumption of chemicals. Open Air Pool Up to 10kwh per M² water surface per day can be lost Inside Pool Up to 4 kwh M² water surface per day can be lost The charts show graphically how much you can save when you install a pool cover 
The energy gain from solar radiation is not taken into account Water temp 24°C Average air temp 15.6°C Average air humidity70% Average wind speed 1 ms-1 Average period of use 9 hours 
Water temp 27°C Average air temp 28°C Average air humidity 60% Average period of use 9 hours
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