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Characteristics of condensing and evaporating heat transfer using hydrocarbon refrigerants.

Author(s) : LEE H. S., YOON J. I., KIM J. D., et al.

Type of article: Article

Summary

This paper discusses the heat transfer characteristics of R290 (propane), R600a (isobutane) and R1270 (propylene) as anenvironment-friendly refrigerant and R22 as a HCFCs refrigerant for condensing and evaporating. An experiment was performed for a conventional vapour compression type heat pump system. The test section was a horizontal double-pipe heat exchanger. A tube diameter of 12.70 mm with 1.315 mm wall thickness was used for this experiment. The experimental results show that the local condensing heat transfer coefficients of hydrocarbon refrigerants were higher than those of R22. The average condensing heat transfer coefficient for R1270 was a maximum value and for R22 was a minimum value among the refrigerant tested. The experimental results of comparing the condensing heat transfer coefficients agreed satisfactorily to the referenced simulation data such as the Cavallini-Zecchin's correlation for all refrigerants. The local evaporating heat transfer coefficients of hydrocarbon refrigerants were higher to those of R22. The average evaporating heat transfer coefficient increased with the increase of mass velocity. The results show that the evaporating heat transfer coefficients in hydrocarbon refrigerants were higher than that of R22. The experimental results for all the refrigerants in general agreed with Kandlikar's correlation for the evaporating heat transfer. [Reprinted with permission from Elsevier. Copyright, 2005].

Details

  • Original title: Characteristics of condensing and evaporating heat transfer using hydrocarbon refrigerants.
  • Record ID : 2006-1641
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 26 - n. 10
  • Publication date: 2006/07

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