As part of a Government project to improve energy efficiency and cost-savings at Noble's Hospital in Braddan on the Isle of Man, the hospital had a requirement to replace the existing pumps at the site which were installed when the building was constructed in 2003.
After initial trials to demonstrate its energy-efficient alternatives, Wilo supplied a number of its DL-E and BL pump models.
Wilo was able to illustrate the significant savings which the hospital could achieve by replacing its existing pumps with energy-efficient Wilo alternatives. These were mainly DL-E products, which come with integrated inverters for variable speed. The new pumps were supplied in stages as part of gradual replacement programme, with the DL-E models installed at the various sub-heat stations across the site. Each sub-heat station has a pump for constant temperature and one for variable temperature requirements.
A single BL pump with Danfoss inverter was also provided during the trial stage, which was fitted to the primary chilled water circuit. Following the successful trial, a further seven of these are planned to be installed on the chilled water circuits, which are supplied by two 400kW water chillers and an ICE storage unit.
As an example of the savings that have been achieved on the site, the BL pump installed on the chilled water system is so far delivering £11,000 per annum in savings when compared to its fixed speed predecessor, based on £0.14 per kWh.