Evaporation heat transfer and pressure drop of low GWP R-404A alternative refrigerants in a multiport tube

Cheol Hwan Kim, Nae Hyun Kim*

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Considering the phase out of the hydrofluorocarbons (HFCs), the search for an alternative refrigerants is of an urgent issue. In this study, four R-404A alternative refrigerants (R-448A, R-449A, R-455A, R-454C) were tested in a multiport tube having 1.61 mm hydraulic diameter. The tests were conducted changing the mass flux from 200 to 400 kg/m2s, heat flux from 2.8 to 6.5 kW/m2 at the saturation temperature of 15 °C. The results showed that the heat transfer coefficients of R-404A were higher than those of the alternative refrigerants. However, the pressure drops of R-404A were smaller than those of those of the alternative ones. Possible explanations are provided based on the thermophysical properties and the temperature glides amongst refrigerants. At a low heat flux, the heat transfer coefficient increased as the mass flux or vapour quality increased. At a high heat flux, however, the heat transfer coefficient was relatively independent of the mass flux or vapour quality. This suggested that both the nucleate boiling and the convective heat transfer contributed to the heat transfer in the present multiport tube. Comparison with the existing correlations revealed that the mixture correlation of Shah [53] reasonably predicted the heat transfer coefficients with the RMSE of 0.16, although the trends between the data and the predictions were somewhat different. The pressure drop data were reasonbly predicted by several mini-channel correlations with the RMSE of 0.16.

本文言語English
論文番号122386
ジャーナルInternational Journal of Heat and Mass Transfer
184
DOI
出版ステータスPublished - 2022 3月
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学
  • 流体および伝熱

フィンガープリント

「Evaporation heat transfer and pressure drop of low GWP R-404A alternative refrigerants in a multiport tube」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル