Boiling Heat Transfer and Pressure Drop of R410A Inside Horizontal Circular Tube Inserting a Twisted-Tape

DOI
  • UZUHASHI Hideo
    Present address: UNBEC Former: Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences (Doctor's course), University of Yamanashi
  • TSUNODA Hiroyuki
    Graduate School of Interdisciplinary Research, University of Yamanashi
  • KAWAI Toshiyuki
    Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences (Master's course), University of Yamanashi
  • TORIKAI Eiko
    Graduate School of Interdisciplinary Research, University of Yamanashi
  • ICHIMIYA Koichi
    Graduate School of Interdisciplinary Research, University of Yamanashi

Bibliographic Information

Other Title
  • ねじりテープ挿入水平円管内におけるR410A の沸騰熱伝達と圧力損失

Abstract

<p> This paper aims to investigate the effect of a twisted-tape insert on heat transfer enhancement in the evaporator of air conditioner. A mixed refrigerant R410A was used in this experiment. Two types of evaporation tubes with different inner diameters, 17.05 mm and 7.93 mm, were prepared at the test section. Experiments were conducted over a wide range of mass velocities from 77 to 613 kg/m2s. In addition, several types of twisted tapes with different twist pitches were made for each tube. The pressure drop and heat transfer coefficient of the test section were measured by changing the refrigerant quality for the smooth tube and the tape-inserted tube. Furthermore, the refrigerant flow patterns were visualized upstream and downstream of the test section. It was found that the increase in pressure drop due to the twisted-tape insert was more pronounced when the flow pattern was a stratified-wavy. While the heat transfer coefficient of the tape-inserted tube was almost the same as that of the smooth tube when the flow pattern was annular, the increase in the heat transfer coefficient due to the tape insertion was clearly observed as the pattern shifted to a mist flow.</p>

Journal

Details 詳細情報について

  • CRID
    1390576118538952448
  • DOI
    10.11322/tjsrae.21-22
  • ISSN
    2185789X
    13444905
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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