Background

There are four fresh water cooled chillers producing 1200TR cooling capacity to a high technology building.

Ordinary chemicals such as biocide, scale and corrosion inhibitor are used in the condensing water. Ozonation was also used to increase the disinfection power. Mineral scale deposit and biofilm were coated on the tubes which required annual tube cleaning to restore the cooling power.

Ozonator demanded high maintenance cost and shut down occasionally due to unavailable ozone element.

In order to improve the energy efficiency of chillers and heat pumps and maintain the disinfection power when ozonator is down, AquaKLEAR is installed.

Moreover the ozonation system including the ozonator, air dryer, air compressor, water pump were shut down on the day when AquaKLEAR was switched on.

Result

After two months of operation without pre-cleaning of the condenser, the energy efficiency of chiller is improved by 9.7% when COP is compared under similar working condition such as cooling load, condensing water supply temperature, chilled water supply temperature and the time since tube cleaning.