With more than 300,000 visitors flocking to a popular swimming pool every year, the managers of a busy Hertfordshire leisure complex were working overtime to maintain acceptable poolside conditions.
A total loss ventilation system was ejecting air from the Lee Valley Leisure Centre in Broxbourne, at the rate of eight air changes per hour.
Faced with escalating energy bills, the centre operators called in Calorex Heat Pumps, who recommended a heat recovery and dehumidification system to provide a one-stop environmental control solution.
The pool complex was refurbished four years ago when a Calorex HRD unit was installed. The machine, located in a basement plant room, continues to maintain optimum pool air conditions while providing the majority of the pool water and air heating by virtue of heat recovery from the dehumidification process.
An energy-efficient HRD heat pump system will remove moisture from the atmosphere, collect its latent energy and re-use it to assist water and air heating, creating a self-perpetuating heat cycle that ensures energy costs are kept to a minimum.
Furthermore, a heat pump heat recovery unit will introduce sufficient fresh air input to maintain the optimum condition for bathers and spectators alike while ensuring that humidity levels are kept low enough to safeguard the building and fabric from moisture and damage.
During this process, outgoing exhaust air will be stripped of both latent and sensible energy that is recovered to the fresh air stream via the heat recovery process
During warm weather, this process will reverse by rejecting unwanted energy to outside and cooling incoming fresh air to maintain comfortable air temperatures within the pool hall.
Only a heat recovery circuit that contains a refrigeration circuit can recover such large quantities of latent energy and provide a true air conditioning effect during warm weather.
Heat pump technology drastically cuts down the cost of running a pool as it permits a high âcoefficient of performance?(COP) to be attained. An overall figure of 3.5:1 is realistic. This means effectively, for each one kW of electrical energy used, we can expect to recover 3.5kW of heat energy, thus generating major savings in CO2 emmisions.