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Performance analysis and improvement of air-to-water chillers for application in a wide ambient temperature range.

Author(s) : DING G., FU L.

Type of article: Article

Summary

Some air-to-water chillers can work well in summer but encounter problems in low temperature ambiences. When the ambient temperature decreases below a certain level, the cooling capacity of the chiller drops rapidly or in severe situations the compressor stops running. In order to expand the applicable conditions, the performance variation of an air-to-water chiller in a wide range of ambient temperatures was analysed based on simulation, and a new type of air-to-water chiller is presented, in which an auxiliary capillary tube is installed parallel to the thermostatic expansion valve and a variable number of condenser fans is used. A suitable chiller control strategy is proposed, and the performance of the chiller across an assorted range of ambient temperatures is also predicted. The operation of the capillary tube and the cooling fans were found to be a function of the coolant temperatures and the chiller operation has been tested for a period of more than a year.

Details

  • Original title: Performance analysis and improvement of air-to-water chillers for application in a wide ambient temperature range.
  • Record ID : 2005-1823
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 25 - n. 1
  • Publication date: 2005/01

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