Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser

Ebrahim Al-Hajri, Amir H. Shooshtari, Serguei Dessiatoun, Michael M. Ohadi

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m-2s-1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson-Chato correlation for heat transfer coefficient and Lockhart-Martinelli correlation for pressure drop for the range of parameters was investigated.

Original languageBritish English
Pages (from-to)588-600
Number of pages13
JournalInternational Journal of Refrigeration
Volume36
Issue number2
DOIs
StatePublished - 2013

Keywords

  • Condensation
  • Correlations
  • Experimentation
  • Heat transfer coefficient
  • Microchannels
  • Pressure drop

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