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Convective boiling of pure and mixed refrigerants: an experimental study of the major parameters affecting heat transfer.

Author(s) : GRECO A.

Type of article: Article

Summary

An experimental study is carried out to investigate the characteristics of the evaporation heat transfer for different fluids. Namely, pure refrigerants fluids (R-22 and R-134a), azeotropic and quasi-azeotropic mixtures (R-404A, R-410A, R-507) and zeotropic mixtures (R-407C and R-417A). The test section is a smooth, horizontal, stainless steel tube (6 mm ID, 6 m length) uniformly heated by the Joule effect. The flow boiling characteristics of the refrigerant fluids are evaluated in 250 different operating conditions. Thus, a data-base of more than 2000 data points is produced. The experimental tests are carried out varying: (i) the refrigerant mass fluxes within the range 200-1100 kg/m2.s; (ii) the heat fluxes within the range 3.50-47.0 kW/m2; (iii) the evaporating pressures within the range 3.00-12.0 bar. In this study, the effect on measured heat transfer coefficient of vapour quality, mass flux, saturation temperature, imposed heat flux, thermo-physical properties are examined in detail. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Convective boiling of pure and mixed refrigerants: an experimental study of the major parameters affecting heat transfer.
  • Record ID : 2008-1222
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 51 - n. 3-4
  • Publication date: 2008/02

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