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International journal of refrigeration = Revbue internationale du froid v.74, 2017년, pp.425 - 434   SCI SCIE
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Transfert de chaleur lors de la condensation de reflux du R134a A l'intErieur d'un tube A micro-ailettes avec diffErentes inclinaisons de tube
Heat transfer during reflux condensation of R134a inside a micro-fin tube with different tube inclinations

Yildiz, S. (Faculty of Mechanical Engineering, Yildiz Technical University, Istanbul 34349, Turkey ) ; Duymaz, G. (FNSS Savunma Sistemleri A.Ş., Oğulbey Mahallesi, Kumludere Caddesi No:11, Gölbaşı, Ankara 06830, Turkey ) ; Ziegler, F. (Institut fuer Energietechnik, Technische Universitaet Berlin, KT2, Marchstraße 18, Berlin D-10587, Germany ) ; Auracher, H. (Institut fuer Energietechnik, Technische Universitaet Berlin, KT2, Marchstraße 18, Berlin D-10587, Germany ) ;
  • 초록  

    Abstract This study presents an experimental investigation of the heat transfer occurring during reflux condensation of refrigerant R134a in an inclined micro-fin tube (0.008 m OD, 0.5 m length). The experiments were carried out at a system pressure of 0.74 MPa and at inclination angles of 30°, 38°, 45°, 60° and 90° from the horizontal. The experiments indicated that the inclination angle has a significant effect on heat transfer during reflux condensation. The maximum reflux heat transfer coefficient was found at 30° inclination angle. At this arrangement, the heat transfer increased by a factor of 2.45 compared to the vertical case. A comparison with previous studies suggests that the heat transfer in a micro-fin tube is 2.2 times better than that in a plain tube, and 1.34 times better than that in a plain rectangular channel both at 30° inclination. Highlights Heat transfer during reflux condensation inside an inclined micro-fin tube is studied. The highest heat transfer rate is obtained at 30° from the horizontal. Heat transfer at 30° inclination is 2.45 times better compared to vertical orientation. Heat transfer in a micro-fin tube is 120% higher than in a plain tube at 30° from the horizontal. Heat transfer is 34% higher in a micro-fin tube than in a rectangular channel at 30° from the horizontal.


  • 주제어

    Reflux condensation .   R134a .   Heat transfer .   Micro-fin tube .   Inclined tube .   Condensation de reflux .   R134a .   Transfert de chaleur .   Tube à micro-ailettes .   Tube incliné.  

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