Condensation heat transfer characteristics of R245fa in a shell and plate heat exchanger for high-temperature heat pumps

Junyub Lim, Kang Sub Song, Dongwoo Kim, Dong Chan Lee, Yong Chan Kim

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this study, the condensation heat transfer characteristics of R245fa in a shell and plate heat exchanger (SPHE) are measured and analyzed by varying the mean vapor quality from 0.16 to 0.86, mass flux from 16.0 to 45.0 kg m−2 s−1, heat flux from 1.3 to 9.0 kW m−2, and saturation temperature from 90 to 120 °C for high-temperature heat pumps (HTHPs). The condensation heat transfer coefficient and frictional pressure drop are shown to increase with increasing mean vapor quality and mass flux and with decreasing saturation temperature. The condensation heat transfer coefficient of R245fa in SPHE is on average 5.9% lower than that in the brazed plate heat exchanger (BPHE) with a similar effective heat transfer area. However, the average two-phase frictional pressure drop of R245fa in SPHE is 16.7% lower than that in BPHE. Empirical correlations for the condensation heat transfer coefficient and two-phase frictional pressure drop in SPHE are developed with mean absolute errors of 8.2% and 9.4%, respectively.

Original languageEnglish
Pages (from-to)730-739
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume127
DOIs
Publication statusPublished - 2018 Dec 1

Keywords

  • Condensation heat transfer coefficient
  • High-temperature heat pumps
  • R245fa
  • Shell and plate heat exchanger
  • Two-phase frictional pressure drop

ASJC Scopus subject areas

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

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