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Heat transfer coefficient and pressure drop during evaporation of R1234yf, R134a and R22 in horizontal circular small tubes.

Number: pap. n. 2

Author(s) : CHIEN N. B., OH J. T., SAITO K., et al.

Summary

Experimental data of heat transfer coefficient and pressure drop during evaporation of R1234yf, R134a and R22 in horizontal circular small tubes were compared. The local heat transfer coefficient and pressure drop were obtained for heat fluxes ranging from 10–35 kW/m2, mass fluxes ranging from 100–650 kg/m2.s, saturation temperatures of 5, 10 and 15?, and quality up to 1.0. The test section was made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm, lengths of 1000, 2000 and 3000 mm. Effects of heat flux, inner tube diameter and saturation temperature on heat transfer coefficient are reported in this study. Nucleate boiling heat transfer contribution was predominant, especially at low quality region, and laminar flow appeared in the evaporative small tubes. The experimental results were compared against four existing heat transfer coefficient and new correlation of heat transfer coefficient and pressure drop are developed with good prediction.

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Pages: 10 p.

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Details

  • Original title: Heat transfer coefficient and pressure drop during evaporation of R1234yf, R134a and R22 in horizontal circular small tubes.
  • Record ID : 30006394
  • Languages: English
  • Source: RCR 2012. 3rd IIR Workshop on Refrigerant Charge Reduction in Refrigerating Systems: Valencia, Spain, October 25-26, 2012.
  • Publication date: 2012/10/25

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