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Design method and application effects of embedded-clapboard distributor on refrigerant distribution among multi-tubes of micro-channel heat exchangers.

Author(s) : WU G., YAN Z., ZHUANG D., DING G., CAO F., MENG J.

Type of article: IJR article

Summary

To solve the problem of non-uniform refrigerant distribution among multi-tubes of micro-channel heat exchangers (MCHXs), a novel embedded-clapboard distributor is presented in this study, in which the embedded clapboards have a spray hole to transform the irregular flow pattern of inlet refrigerant into a dispersed bubble flow, and to form a cyclic channel to maintain the regular layout of dispersed bubble flow. The design method for the distributor is illustrated, including the calculation method for the spray hole diameter deduced from the transition criteria of dispersed bubble flow at both the horizontal and the vertical installations, and the calculation method for the hydraulic diameter of cyclic channel deduced based on the Bernoulli Equation for the circulation of dispersed bubble flow. The validation of refrigerant distribution performance includes the comparison of two-phase flow pattern between the proposed distributor prototype and conventional distributor prototype manufactured with transparent material, and the test of distribution unevenness among the outlet tubes for these two types of distributor prototypes. The experimental results show that the embedded-clapboard distributor forms the regular dispersed bubble flow at all installation patterns, and the average unevenness of the proposed distributor at the vertical, the sloped and the horizontal installations is 42.5%, 45.9% and 41.4% lower than that of the conventional cylinder-type distributor, respectively.

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Pages: 420-433

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Details

  • Original title: Design method and application effects of embedded-clapboard distributor on refrigerant distribution among multi-tubes of micro-channel heat exchangers.
  • Record ID : 30027817
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 119
  • Publication date: 2020/11
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.07.019
  • Document available for consultation in the library of the IIR headquarters only.

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