An Experimental Investigation of R600a Condensation in a Multiport Microchannel

Burak Çoban*, Lütfullah Kuddusi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study aims to provide condensation heat transfer coefficients of R600a (isobutane) refrigerant under mass fluxes between 50 and 98 kg/m2·s at saturation temperatures of 35 °C, 40 °C and 45 °C. Additionally, experiments are conducted with varying inlet vapour quality to understand its effect on the condensation heat transfer measurement. An aluminium multiport microchannel with a hydraulic diameter ((Formula presented.)) of 0.399 mm is used, where a plexiglass cover is mounted on the top of the microchannels to observe the flow conditions. A 1D heat transfer through the aluminium block is assumed, and heat flux through the refrigerant to the coolant is measured to obtain condensation heat transfer coefficients of R600a. The results showed that decreasing saturation temperature and increasing vapour quality increase the condensation heat transfer coefficient. Increasing refrigerant mass flux increases the heat transfer coefficient up to a specific mass flux. It is observed that the effect of inlet vapour quality becomes significant as introduced quality decreases due to increasing fluctuation.

Original languageEnglish
Article number618
Issue number5
Publication statusPublished - May 2024

Bibliographical note

Publisher Copyright:
© 2024 by the authors.


  • condensation
  • heat transfer coefficient
  • microchannel
  • multiport
  • R600a
  • refrigeration


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