Heat Transfer Performance During Condensation Inside Spiralled Micro-Fin Tubes
Author:
Bukasa Jean-Pierre M.1, Liebenberg Leon2, Meyer Josua P.3
Affiliation:
1. Department of Mechanical Engineering, Rand Afrikaans University, PO Box 524, Auckland Park 2006, Johannesburg, South Africa 2. Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa 3. Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 000, South Africa
Abstract
The effect of the spiral angle on the heat transfer performance in micro-fin tube condensers has not yet been clearly established because other geometric parameters affecting the heat transfer performance were simultaneously varied in previous studies. This paper reports on the influence of the spiral angle on the heat transfer during condensation inside spiralled micro-fin tubes having all other geometric parameters constant. Tests were conducted for condensation of R-22, R-134a, and R-407C inside a smooth (9.52 mm outer diameter) and three micro-fin tubes with approximately the same diameter, having spiral angles of 10 deg, 18 deg, and 37 deg, respectively. Experimental results indicated a heat transfer augmentation with spiral angle increase. A new semi-empirical predictive correlation was developed for practical design of spiralled micro-fin tubes. The proposed new correlation predicted the majority of experimental results of the present study within a deviation zone of ±20%.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference19 articles.
1. Schlager, L. M., Pate, M. B., and Bergles, A. E., 1990, “Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal 12.7 mm Microfin Tubes With Refrigerant 22,” ASME J. Heat Transfer, 112, pp. 1041–1047. 2. Yasuda, K., Ohizumi, K., Hori, M., and Kawamata, O., 1990, “Development of Condensing Thermofin-HEX-C Tube,” Hitachi Cable Rev., 9, pp. 27–30. 3. Chiang, R.
, 1993, “Heat Transfer and Pressure Drop During Evaporation and Condensation of Refrigerant R-22 in 7.5 mm Diameter Axial and Helical Grooved Tubes,” AIChE Symp. Ser., 295(89), pp. 205–210. 4. Tatsumi, A. K., Oizumi, K., Hayachi, M., and Itoh, M., 1982, “Application of Inner Grooves Tubes to Air Conditioners,” Hitachi Rev., 32(1), pp. 55–60. 5. Cavallini, A., Del Col, D., Doretti, L., Longo, G. A., and Rossetto, L., 2000, “Heat Transfer and Pressure Drop During Condensation of Refrigerants Inside Horizontal Enhanced Tubes,” Int. J. Refrig., 23, pp. 4–25.
Cited by
19 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|