Journal of Applied Science and Engineering

Published by Tamkang University Press


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Meng-Chang Tsai1, Shung-Wen Kang This email address is being protected from spambots. You need JavaScript enabled to view it.2, Heng-Yi Li1 and Wen-Fa Tsai1

1Institute of Nuclear Energy Research, Taoyuan, Taiwan 325, R.O.C.
2Department of Mechanical and Electro-Mechanical Engineering, Tamkang University. Tamsui, Taiwan 251, R.O.C.


Received: March 20, 2015
Accepted: July 9, 2015
Publication Date: September 1, 2015

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A prototype two-phase reverse-loop thermosyphon (RLT) was fabricated to transport thermal energy downwards to a thermal storage tank. The effect the filling ratio exerted on the thermal performance of the RTL was investigated by conducting experiments that were performed by a range between 47% and 63%. The prototype device comprised an evaporator, a condenser, a reservoir (preheater), and pipes connecting each of the components. The heat transport height was 1500 mm from the evaporator to the bottom of the condenser. Methanol with a concentration of 95% was used as the working fluid. The temperature distribution, temperature difference between the evaporator and condenser, and thermal resistance of the thermosyphon were measured. In addition, a cyclic case, in which the power in coils was alternately switched on and off according to a square wave function was studied. The results indicated that the maximal thermal performance of the RLT occurred when the filling ratio was 60% and the input power was 660 W.

Keywords: Reverse-loop, Thermosyphon, Heat Transfer Downward, Cyclic Operation


  1. [1] Kang, S. W., Tsai, M. C., Hsieh, C. S. and Chen, J. Y., “Thermal Performance of a Loop Thermosyphon,” Tamkang Journal of Science and Engineering, Vol. 13, No. 3, pp. 281-288 (2010). doi: 10.6180/jase.2010.13. 3.07
  2. [2] Franco, A. and Filippeschi, S., “Closed Loop Two-Phase Thermosyphon of Small Dimensions a Review of the Experimental Results,” Microgravity Science and Technology, Vol. 24, pp. 165-179 (2012). doi: 10.1007/ s12217-011-9281-6
  3. [3] Koito, Y., Ahamed, M. S., Harada, S. and Imura, H., “Operational Characteristics of a Top-Heat-Type Long Heat Transport Loop through a Heat Exchanger,” Applied Thermal Engineering, Vol. 29, No. 23, pp. 259 264 (2009). doi: 10.1016/j.applthermaleng.2008.02.024
  4. [4] Dobriansky, Y. and Yohanis, Y. G., “Cyclical Reverse Thermosiphon,” Archives of Thermodynamics, Vol. 31, No. 1, pp. 332 (2010). doi: 10.2478/v10173-010- 0001-1
  5. [5] Dobriansky, Y., “Concepts of Self-acting Circulation Loops for Downward Heat Transfer (Reverse Thermosiphons),” Energy Conversion and Management, Vol. 52, pp. 414425 (2011). doi: 10.1016/j.enconman.2010. 06.073