Energy savings of 40 per cent were achieved after Westin Drives engineers installed new pumps in a sports stadium swimming pool.
The stadium company wished to replace the recirculating pumps for its main pool and invited Westin Drives to tender for the work.
The pumps were reaching the end of their life, the casings rusted almost to the point of cracking. Our technical services engineers suggested replacing the old star delta starters with an energy-saving variable speed drive panel. A 33% energy saving was calculated, giving a pay-back period of 14 months on the new panel.
The proposal was accepted and we were pleased to be given the job against stiff competition from other companies.
The old system consisted of three pumps, day (100% flow), night (75% flow) and an emergency spare (50% flow), which had never been used. Westin suggested replacing the old 75% and 50% pumps with variable speed 100% KSB pumps, controlled by the existing BMS. This meant either pump could be used as an emergency spare.
The same coverage was therefore achieved with only two pumps, meaning the job could be done while leaving the old 100% pump running and minimising downtime.
LENZE i550 inverters were used, set up for using their VFC Eco mode, maximising energy efficiency and minimising running temperature of the motors. The system was installed with no issues except that the old 50% isolator failed because of rusting and was replaced.
The new system was running within five working days, with energy savings of approximately 40% achieved.