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A study on the performance of the airside heat exchanger under frosting in an air-source heat pump water heater/chiller unit.

Author(s) : YAO Y., JIANG Y., DENG S., et al.

Type of article: Article

Summary

Air-source heat pump water heater/chiller (ASHPWHC) units, a cooling and heating source for buildings, are becoming increasingly popular. However, when such a unit is operated as a heating source under low ambient temperature conditions in winter, the formation of frost on the surface of its airside heat exchanger becomes problematic, leading to the degradation of the heat exchanger's performance or even the shutdown of a unit. Therefore it is necessary to have detailed knowledge of the operational characteristics of the airside heat exchanger in an ASHPWHC unit under frosting conditions in order to optimise its structural layout, thus increasing its energy efficiency and operational reliability. The article first reports on the development of a distributed mathematical model of the airside heat exchanger under frosting conditions in an ASHPWHC unit. The model, as firstly seen in the open literature, consists of a frosting sub-model and a heat exchanger sub-model. This is followed by an evaluation of the operational characteristics of the airside heat exchanger under frosting conditions in an ASHPWHC unit using the model developed. In addition, the impact of frosting on the operational performance of an ASHPWHC unit was also evaluated. Discussion on optimising the structural layout of finned tubes used in an airside heat exchangers and improving defrosting control measures is also included in the analysis of the simulated results.

Details

  • Original title: A study on the performance of the airside heat exchanger under frosting in an air-source heat pump water heater/chiller unit.
  • Record ID : 2005-0974
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 17-18
  • Publication date: 2004/08

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