ESG Pool Ventilation systems combine four methods of providing the lowest cost and the best conditions for bathers and staff.

1 ESG damper controlled fresh air ventilation makes it possible to maintain the relative humidity at 60% Rh, the appropriate set point, and in doing this, make big savings.  This is because the maximum provision of fresh air must be large enough to absorb the evaporation at maximum bathing load, as well as doing this with the most humid outside air, whereas typical conditions only require a small fraction of this maximum.  The ESG system also makes big additional savings by continuously adjusting the minimum level of fresh air provided in line with the changing level of pool occupation.  ESG is able to calculate the level of occupation from its control parameters and this method is more accurate than CO2  sensing. Our control system also saves around 95% of the fresh air with pool covers on.

2   Heat recovery with a plate heat exchanger typically averages more than 60% sensible energy saving, but increases the pressure drop on the fans, adding more than 50% to fan motor electricity costs.  The ESG damper controls system avoids more than 85% of this additional energy cost.

3   Variable fan speed control continuously varies the ventilation rate provided by our system, to meet changing levels of occupation and outside temperature.  This more than halves fan motor costs.  It does this by reducing the ventilation rate during periods of low occupation, see 1 and at night, with a pool cover in place.

Good air distribution is vital.  It helps to maintain healthy conditions for bathers and staff and at the same time ensure minimum use of fresh air.

4   Good air distribution ensures that circulating air efficiently picks up both the evaporation from the pool and the chloramines, by products of pool water dosing, that are heavier than air and tend to stay close to the water surface. Chloramines are a contributory factor in asthma.

See Case Studies.

5 The patented ESG pool hall and changing room ventilation unit combines the ventilation of both areas from a single air handling unit, while ensuring that soiled air from toilets and showers is exhausted to atmosphere without recirculation, patent GB 2430486.  Compared to two separate systems, it makes a substantial capital cost saving.  In addition, it also increases energy saving in two significant respects.  First it avoids providing fresh air twice for the same number of bathers.  Second, unsoiled air provided for the changing rooms, typically around 60%, can be re-circulated through the pool hall and contribute to its dehumidification requirements and increase savings.

ESG Pool provides the complete design and highest level of energy savings for the largest energy user in the Centre.

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