Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5017327 | International Journal of Refrigeration | 2017 | 34 Pages |
Abstract
This study presents an experimental investigation of the heat transfer occurring during reflux condensation of refrigerant R134a in an inclined micro-fin tube (0.008âm OD, 0.5âm length). The experiments were carried out at a system pressure of 0.74âMPa 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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Engineering
Mechanical Engineering
Authors
S. Yildiz, G. Duymaz, F. Ziegler, H. Auracher,