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Heat transfer during reflux condensation of R134a inside a micro-fin tube with different tube inclinations.

Author(s) : YILDIZ S., DUYMAZ G., ZIEGLER F., et al.

Type of article: Article, IJR article

Summary

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.

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Pages: 423-432

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Details

  • Original title: Heat transfer during reflux condensation of R134a inside a micro-fin tube with different tube inclinations.
  • Record ID : 30020123
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 74
  • Publication date: 2017/02

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