Condensation of refrigerants in a multiport tube with rectangular minichannels

Daisuke Jige, Norihiro Inoue, Shigeru Koyama

    Research output: Contribution to journalArticlepeer-review

    91 Citations (Scopus)


    This study investigated the condensation heat transfer and pressure drop characteristics of refrigerants R134a, R32, R1234ze(E), and R410A in a horizontal multiport tube with rectangular minichannels, in the mass velocity range of 100-400 kg m-2 s-1 and saturation temperature set at 40 and 60 °C. The effect of mass velocity, vapor quality, saturation temperature, refrigerant properties, and hydraulic diameter of rectangular channels on condensation characteristics is clarified. A new correlation is proposed for predicting the frictional pressure drop for condensation flow in minichannels. A heat transfer model for condensation heat transfer in rectangular minichannels is developed considering the flow patterns and effects of vapor shear stress and surface tension. Then, based on this model, a new heat transfer correlation is proposed. The proposed correlations successfully predict the experimental frictional pressure drop and heat transfer coefficients of the test refrigerants in horizontal rectangular minichannels.

    Original languageEnglish
    Pages (from-to)202-213
    Number of pages12
    JournalInternational Journal of Refrigeration
    Publication statusPublished - Jul 1 2016

    All Science Journal Classification (ASJC) codes

    • Building and Construction
    • Mechanical Engineering


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