Background

There are six fresh water cooled chillers producing over 3400TR cooling power in a commercial building.

Ordinary chemicals such as biocide, scale and corrosion inhibitor are used in the condensing water. Due to the limitation of chemicals and constraint of treatment program, mineral scale deposit and development of biofilm led to necessity of annual tube cleaning to restore the energy efficiency.

In order to improve the COP of the chiller plant, AquaKLEAR is installed. The condenser tubes were inspected and the condition is shown in picture 1 before switching on the AquaKLEAR.

Result

After one year of operation, the data logged by the existing BMS shows there is an 11.0% improvement in energy efficiency of chillers is detected when COP of chiller is compared under a similar working condition such as cooling load, chilled water supply temperature, condensing water supply temperature and the time since tube cleaning.

The investment is paid back in 24 months. The water quality is also improved due to the bacteria killing function of AquaKLEAR possessed.