Thursday, 15 October 2015

Gibbons Engineering Group help clients across a multitude of sectors to reduce the load on chillers and increase the energy-efficiency of their air handling units (AHUs).

Gibbons Ultraviolet Solutions are the sole UK distributer for the CoilCare® system manufactured by BioZone Scientific International (BSI). This innovative product works by applying ultraviolet C (UVC) light (a powerful germicide) to cooling coils, which destroys the build-up of biofilm. In doing so, this restores the coil’s coefficient of heat transfer back to its as-new value. Our research suggests that the presence of biofilm can reduce the coefficient of the coil’s heat transfer by as much as 20%.

For chilled water supplied to the coil at, for example, 6°C, the water coming off the coil must be cooler for a contaminated coil with a lower coefficient of heat transfer (lower delta-T) than for a clean coil in order to remove the same amount of heat from the air.

The increase in delta-T is inversely proportional to the volume of chilled water required by the coil. Chiller manufacturers generally quote a kW per tonne of chilled water figure, so a 20 per cent increase in delta-T should result in a 17 per cent reduction in the chilled water cost.

The other benefits of CoilCare® include:
  •          Prevents contamination by airborne spores, bacteria, viruses that result      from biofilm
  •          Eliminates odours
  •          Increases air volume by around 10 per cent with the fan at a fixed    
         speed (summer and winter) or a 27 per cent reduction in fan power if
  •      the speed  is reduced
  •          Extends coil life
  •          Removes the need for coil cleaning maintenance
  •          Reduces or eliminates any low delta-T problems that may occur with          chillers
To discuss the advantages of installing the CoilCare® system in your AHU equipment, call Colin Hardman on 07940 544206 or email


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