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Comparison of energy supplies and consumptions in heat pump systems using finned tube and microchannel heat exchangers during defrosting.

Author(s) : XIONG T., YING Y., HAN B., YAN G., YU J.

Type of article: IJR article

Summary

The frosting behavior of microchannel heat exchangers (MCHXs) has been studied extensively, but little is known about their defrosting performance in heat pump systems based on heat transfer characteristics analysis. In this study, the defrosting performance of heat pump systems using MCHX and finned tube heat exchanger (FTHX) was studied experimentally. Three types of energy supplies and four types of energy consumptions were calculated and quantitatively analyzed during defrosting processes. Although the indoor fan was turned off, the indoor air source provided more than 60% of the energy in both heat exchanger heat pump systems. The defrosting time and the energy consumption of FTHX heat pump system were 59.6% and 55.1% less than those of MCHX heat pump system, respectively, even though its frosting mass was 17.2% more. In contrast, the retained water mass and the vaporized water mass on the MCHX were 99.7% and 123.1% higher than those of FTHX, respectively. This is mainly due to the poor drainage performance of MCHX, which increases the melted frost contact time on the heat exchanger surface and therefore prolonging the defrosting time. Therefore, the defrosting efficiency of the MCHX heat pump system was 22.9% lower than that of the FTHX heat pump system. The contribution of this study is that the defrosting energy supplies and consumptions were quantitatively studied, and the reason of low defrosting efficiency of MCHX was analyzed.

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Pages: 222-232

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Details

  • Original title: Comparison of energy supplies and consumptions in heat pump systems using finned tube and microchannel heat exchangers during defrosting.
  • Record ID : 30029234
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 132
  • Publication date: 2021/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.09.003
  • Document available for consultation in the library of the IIR headquarters only.

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