Cooling heat transfer characteristics of R744 - Experimental research on the cooling heat transfer and pressure drop in supercritical condition

Masafumi Katsuta, Naoyuki Miyachi, Takahiro Oshiro, Youhei Ohno

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This paper describes the cooling heat transfer and hydraulic characteristics of R744 refrigeration cycle. In this experiment, using R744 as the working refrigerant and the comparison is made between the experimental data and the proposed correlating equations to confirm the cycle simulation method. The main test section is a double tube heat exchanger of a stainless tube with ID of 3.0 mm and 300 mm in length, and the outside tube is used an acrylic tube. Throughout the experiments, it is recognized that heat transfer coefficient reaches its peak value at around the supercritical temperature, and pressure drop increases with rising refrigerant temperature and it increases dramatically at the supercritical condition. Moreover, when the mass flux becomes high, the heat transfer coefficient and the pressure drop increase while the influence of the heat flux is negligible. Finally, it is clear that both of heat and hydraulic characteristics are very sensitive about the effect of the lubricating oil.

    Original languageEnglish
    Title of host publication5th Asian Conference on Refrigeration and Air Conditioning, ACRA 2010 - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System
    PublisherJapan Society of Refrigeration and Air Conditioning Engineering (JSRAE)
    ISBN (Print)9781634391252
    Publication statusPublished - 2010
    Event5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010 - Tokyo
    Duration: 2010 Jun 72010 Jun 9

    Other

    Other5th Asian Conference on Refrigeration and Air Conditioning - Green Breeze from Asia: Frontiers of Refrigerants, Heat Transfer and System, ACRA 2010
    CityTokyo
    Period10/6/710/6/9

    Keywords

    • Gas Cooler
    • Heat Transfer
    • Lubricating Oil
    • Pressure Drop
    • R744
    • Supercritical Condition

    ASJC Scopus subject areas

    • Engineering(all)
    • Environmental Engineering

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