Modelling of improved energy performance of air-cooled chillers with mist pre-cooling

F. W. Yu, K. T. Chan

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Air-cooled chillers are widely used to provide cooling energy and yet pragmatic and simple energy efficient measures for them are still lacking. This paper considers how their coefficient of performance (COP) can be improved by using mist to pre-cool ambient air entering the condensers. The benefit of this application rests on the decrease of compressor power resulting from the reduced condenser air temperature with insignificant consumption of water and pump power associated with the mist generation. Based on a simulation analysis of an air-cooled screw chiller operating under head pressure control, applying such mist pre-cooling enables the COP to increase by up to 7.7%. Precise control of mist generation rate and integration with floating condensing temperature control are the major challenges of using a mist system to maximize electricity savings. The results of this study will prompt low-energy operation of existing air-cooled chillers working for various climatic conditions.

Original languageEnglish
Pages (from-to)825-836
Number of pages12
JournalInternational Journal of Thermal Sciences
Issue number4
Publication statusPublished - Apr 2009


  • Air-cooled chiller
  • Coefficient of performance
  • Electricity consumption
  • Water mist


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