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Characteristics of heat transfer on a microchannel flat tube applied to air-to-refrigerant heat exchangers of air conditioners using R32.

Number: pap. n. 963

Author(s) : ZHENG C. Y., HIROKAWA T., KAJI R., et al.

Summary

Recently, air-to-refrigerant micro-channel heat exchangers have been applied to air-conditioners for their high heat-transfer performance with low air-side pressure drop. Some papers have presented the experimental data on microchannel flat tube applied to such heat exchangers. Among these papers, however, uniform heat load is applied to the test tube unlike a real situation. In the real use, heat load becomes un-uniform along air flow direction as air temperature changes during heat exchange. In this paper, the effect of un-uniform heat load on heat transfer is experimentally investigated. Measurements were carried out by heating microchannel flat tube flowing R32 horizontally. Un-uniform heating is achieved by two each heating blocks with different temperature attached to the test tube from top and bottom. It is found that un-uniform heat load degrades heat transfer comparing to uniform load and it becomes clear that understanding detail phenomena are necessary to predict heat exchanger accurately.

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Pages: 8

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Details

  • Original title: Characteristics of heat transfer on a microchannel flat tube applied to air-to-refrigerant heat exchangers of air conditioners using R32.
  • Record ID : 30026684
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0963
  • Notes:

    Keynote


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