Mendip District Council reduce leisure center energy consumption by 50%

Increases in utility costs have had a great impact on leisure centres across the country. Avalon Leisure operate several facilities for Mendip District Council and are responsible for identifying solutions to improve energy efficiency.

Following initial discussions, Avalon Leisure requested Excalibur undertake a survey to investigate the potential to improve the energy efficiency of their pumps, fans and boilers.

The survey showed that opportunities existed to make significant reductions in energy consumption at Strode Pool in Street, Frome and Wells Leisure Centres.

Mendip District Council agreed to cover the cost of implementation and Excalibur were contracted to complete the project.

All of the swimming pool circulating pumps were using throttling valves to achieve the required flow rates. Excalibur proposed installing inverters to these pumps, allowing the valves to be opened and motor speed reduced to achieve the correct flow rates.

As you would expect, pool occupation varies considerably, the introduction of intelligent control to the motors made it possible to match pump flow rates to pool occupation. These modifications reduced the electrical consumption of all swimming pool circulation pumps by 50%.

The Main Pool Hall supply and extract fans received the same treatment, this realised a similar reduction in fan electrical consumption, while lower extract rates significantly reduced the gas consumption required to heat make up air.

To provide security of operation all of the inverters were mounted in bespoke panels which incorporate an auto bypass, this returns the pump to its’ previous control should the inverter go to a fault position, ensuring no single point of failure has been introduced. Switching was also provided to allow full speed pump operation during backwash of swimming pool filters.

The boilers represented the other major opportunity to reduce energy consumption. It was proposed to install Excalibur Stepmaster boiler sequence control – the conventional existing control was operating a constant flow temperature irrespective of the load in the building. The Stepmaster provides a variable control, reducing flow temperature during periods of low demand and reducing gas consumption by a further 15%.

Download Avalon Leisure Centre Case Study