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An improved method for analyzing a fin and tube evaporator containing a zeotropic mixture refrigerant with air mal-distribution.

Author(s) : LEE J., KWON Y. C., KIM M. H.

Type of article: Article, IJR article

Summary

A new programme was developed to analyse the heat transfer characteristics of fin and tube evaporators that use a zeotropic mixture refrigerant, R407C, as the working fluid. The calculation algorithm is based on EVSIM (NIST), but a tube is segmented into several sections to provide a base unit for the calculations in this study. Therefore, two-dimensional air maldistribution in the tube-length (horizontal) and vertical directions of the evaporator can be considered. The temperature gradient in the flow direction is traced using a discrete pattern to simulate the continuous variation found in actual evaporators. To validate the simulation results, 45 test cases in a real evaporator were performed with two different refrigerant flow path configurations using R22 and R407C refrigerants. The deviation between the simulations and test data was a maximum of 5.4%, and the trends were similar. The local heat transfer predictions were verified by comparing the numerical and test wall temperatures along the refrigerant flow path. Local temperature difference and the heat transfer contributions from each row are also analysed along refrigerant flow path. Furthermore, the impact of air maldistribution is studied with four different types of two-dimensional velocity profiles and the significant difference in heat transfer is analysed. The programme developed in this study will be a useful tool to know all of information related with heat and mass transfer at any local point and can be used for improving the efficiency of zeotropic mixture refrigerant evaporators.

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Pages: 707-720

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Details

  • Original title: An improved method for analyzing a fin and tube evaporator containing a zeotropic mixture refrigerant with air mal-distribution.
  • Record ID : 2004-0060
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 6
  • Publication date: 2003/09

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