Evaporation heat transfer characteristics of R-245fa in a shell and plate heat exchanger for very-high-temperature heat pumps

Kang Sub Song, Sungho Yun, Dong Chan Lee, Kibong Kim, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A shell and plate heat exchanger (SPHE) has been introduced for use in very-high-temperature heat pumps (VHTHPs). However, studies on the evaporation heat transfer characteristics of refrigerants in SPHEs for use in VHTHPs are very limited. In this study, the evaporation heat transfer characteristics of R-245fa in the SPHE are measured and analyzed by varying the saturation temperature, mass flux, heat flux, mean vapor quality, and fluid direction. Experiments are conducted under high temperatures of 60−80 °C for VHTHP applications. The evaporation heat transfer coefficient increases as the mass flux and mean vapor quality increase, whereas it decreases as the heat flux increases. The two-phase frictional pressure drop increases as the mass flux and mean vapor quality increase. The heat transfer performance of the upward flow in the SPHE is better than that of the downward flow. In addition, empirical correlations of the Nusselt number and two-phase friction factor of R-245fa in the SPHE are derived.

Original languageEnglish
Article number119408
JournalInternational Journal of Heat and Mass Transfer
Volume151
DOIs
Publication statusPublished - 2020 Apr

Keywords

  • Evaporation heat transfer
  • R-245fa
  • Shell and plate heat exchanger
  • Two-phase pressure drop
  • Very-high-temperature heat pump

ASJC Scopus subject areas

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

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