Evaporation heat transfer and pressure drop of the interim (R-448A, R-449A) and long term (R-455A, R-454C) low GWP R-404A alternative refrigerants in a smooth tube

Cheol Hwan Kim, Nae Hyun Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Due to the global warming issue, R-404A phases out, and new alternative refrigerants are emerging. In this study, four R-404A alternative refrigerants - two interim refrigerants (R-448A, R-449A) and two long term refrigerants (R-455A, R-454C) - including R-404A were tested in a 5.6 mm inner diameter tube under evaporation condition. The test range included the mass flux from 90 to 300 kg/m2s, heat flux from 5 to 15 kW/m2, and vapor quality from 0.2 to 0.8. The saturation temperature was 10 °C. The results showed that, at a low mass flux, the heat transfer coefficients of R-404A were higher than those of the alternative refrigerants. At a high mass flux and high quality, on the other hand, the reverse was true - the heat transfer coefficients of R-404A were lower than those of the alternative refrigerants. The pressure drops of the alternative refrigerants were larger than those of R-404A. Finally, the data are compared with the predictions by existing correlations.

Original languageEnglish
Article number121903
JournalInternational Journal of Heat and Mass Transfer
Volume181
DOIs
Publication statusPublished - 2021 Dec
Externally publishedYes

Keywords

  • Evaporation heat transfer
  • Low GWP
  • Pressure drop
  • R-404 alternative refrigerant
  • R-448A
  • R-449A
  • R-454C
  • R-455A

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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