Shung-Wen Kang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Meng-Chang Tsai1, Chih-Sheng Hsieh1 and Jian-You Chen1
1Department of Mechanical and Electro-Mechanical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
Received: June 17, 2008 Accepted: November 23, 2009 Publication Date: September 1, 2010
Experimental investigations were performed on a loop thermosyphon, consisting of a condensation section and an evaporation section. The evaporator chamber used in this study has an inside diameter of 25 mm and a height of 25 mm. Three evaporators, without wick structure and with 1 mm and 4 mm thickness wick structures were examined in the test. The experiments were conducted under the condition of 20 °C, 30 °C, 40 °C and 50 °C cooling water, for heating powers from 20 to 250W, working fluid fill ratios of 5 %, 10 %, 20 %, 30 %, 40 % and 50 %. The experiments used methanol and water as the working fluid. When the system reached the steady state, the temperature was recorded in order to evaluate the performance of the thermosyphon. Effect of cooling water temperatures, fluid fill ratio and evaporator type were studied. Finally, the results show that the wick structure can enhance the heat transfer effects directly. The working fluid water can support a large heating range.
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