Two-phase flow boiling heat transfer of R-22 and R-410A in horizontal microchannels

M. Rifaldi, Agus Sunjarianto Pamitran, Kwang Il Choi, Jong Taek Oh, Pega Hrnjak

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Two-phase flow boiling heat transfer characteristics of R-22 and R-410A in horizontal small tubes was observed in this study. Heat flux over range of 10 to 40 kW m-2 was conducted to the test sections, which were made of stainless steel tube with inner tube diameters of 0.3, 0.5, 1.5 and 3.0 mm, and lengths of 0.27, 0.33, 1.5 and 3.0 m, respectively, to obtain the local heat transfer coefficients. Mass flux ran under range of 70 to 600 kg m-2 s-1, saturation temperature under range of 2 to 12°C, and quality under up to 1.0. The section was heated uniformly by applying an electric current to the tube directly. The effects of mass flux, heat flux, inner tube diameter and saturation temperature on heat transfer coefficient were presented. The heat transfer coefficients of the present study were compared using several existing heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model for refrigerants in small tubes, with considering the laminar flow, was developed.

Original languageEnglish
Title of host publication4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
PublisherNational Taipei University of Technology
Pages196-201
Number of pages6
ISBN (Print)9868509610, 9789868509610
Publication statusPublished - 1 Jan 2009
Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei, Taiwan, Province of China
Duration: 20 May 200922 May 2009

Publication series

Name4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

Conference

Conference4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
CountryTaiwan, Province of China
CityTaipei
Period20/05/0922/05/09

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