Condensation Heat Transfer of HFC and HFO Refrigerants in a Horizontal Single Rectangular Mini-channel

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  • MATSUMOTO Takashi
    Department of Mechanical Engineering, Graduate School, Kyushu University Advanced Technology R&D Center, Mitsubishi Electric Corporation
  • ARATA Yohei
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • KUTSUNOYA Kai
    Department of Mechanical Engineering, Graduate School, Kyushu University
  • MIYATA Kazushi
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University
  • HAMAMOTO Yoshinori
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University
  • MORI Hideo
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University

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Other Title
  • 水平単一矩形ミニチャンネルにおけるHFC およびHFO 冷媒の凝縮熱伝達特性
  • スイヘイ タンイツ クケイ ミニチャンネル ニ オケル HFC オヨビ HFOレイバイ ノ ギョウシュク ネツ デンタツ トクセイ

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<p>In this study, to clarify the fundamental characteristics of condensation heat transfer of refrigerant in a horizontal rectangular mini-channel at low mass fluxes down to 40 kg/(m2ꞏs), experiments were performed using a single rectangular small tube with a hydraulic diameter of 1.02 mm. HFC134a, HFC32 and HFO1234ze(E) are used as test refrigerants. The range of refrigerant mass flux condition was 40-400 kg/(m2ꞏs), and that of heat flux was 2-8 kW/m2. From the present data, it was clarified that the condensation heat transfer coefficient at a low mass flux 100 kg/(m2ꞏs) or less was noticeably high value compared with that at relatively high mass flux conditions. Besides, this tendency was different from that was seen in experimental studies using multiport tubes and tendency predicted by existing correlations applied by extension to the low mass flux condition.</p>

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