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Comparative experimental study on flow boiling heat transfer characteristics of pure and mixed refrigerants.

Author(s) : KUNDU A., KUMAR R., GUPTA A.

Type of article: Article, IJR article

Summary

An experimental study is carried out to investigate the characteristics of the flow boiling heat transfer for different fluid, namely, pure refrigerant (R134a), quasi-azeotropic mixture (R410A) and zeotropic mixture (R407C). The test section is a smooth horizontal tube (7.0 mm ID) uniformly heated by the resistance heating effect. The flow boiling characteristics of the refrigerants are evaluated varying: (i) the refrigerant mass velocities within the range 100–400 kgm-2s-1; (ii) the heat fluxes within 3.0–10.0 kWm-2; (iii) the inlet temperatures to the evaporator within 5°C-9°C. In this study, the effect on the heat transfer coefficient and two-phase pressure drop of vapor quality, mass velocity, imposed heat flux and fluid thermo-physical properties are examined in detail. Moreover, an assessment of predictive methods is provided for local heat transfer coefficients; also a direct comparison of flow regimes visualizations for refrigerants with a flow pattern map available in the literature is presented.

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Pages: 136-147

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Details

  • Original title: Comparative experimental study on flow boiling heat transfer characteristics of pure and mixed refrigerants.
  • Record ID : 30011954
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 45
  • Publication date: 2014/09

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