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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.2015007637
pages 527-541

PERFORMANCE TESTS OF DEFROSTING PLATES DESIGNED WITH A PULSATING HEAT PIPE (PHP) AS THE HEAT CARRIER

Chen-I Chao
Engineering and System Science, National Tsing Hua University, Hsinchu City, Taiwan
Wei-Keng Lin
Department of Engineering and System Science, National Tsing-Hua University, Hsinchu City, Taiwan
Ting-Yu Hsiung
Department of Engineering & System Science, Tsing-Hua University, Taiwan
K. C. Liaw
Tairone Energy Saving Tech. Co., LTD, Taiwan
Mengtan Wang
ASIA Industries LTD, Taiwan
Ying Chi Yeh
ASIA Industries LTD, Taiwan
Huang-Chin Sheng
Industrial Technology Research Institute, Taiwan
Shou-I Chen
Industrial Technology Research Institute, Taiwan
Shao-Wen Chen
Institute of Nuclear Engineering and Science and Department of Engineering and System Science, National Tsing Hua University, 101, Sect.2, Kuang Fu Road, Hsinchu, Taiwan 30013, R.O.C.

ABSTRACT

Defrosting plates are among the heat pipe application products currently available on the market. Traditional defrosting plates are made by flattening and bending the heat pipes, which are then tightly sealed between two aluminum plates. A solder paste is then used for adhesion and sealing to increase heat conduction. Heat conduction and the evenness of temperature distribution can also be affected by heat pipes of different geometric shapes as well as by different distributions of heat pipes within the aluminum plates. This study adopted a design using pulsating heat pipes (PHPs) to substitute for the design using traditional heat pipes. The present study processed a closed loop using aluminum plates (length 320 mm, width 200 mm, and depth 6 mm) for the development of defrosting plate products. The working fluid used was CH3OH. Several defrosting plates were manufactured according to their differing numbers of turns of the loop. This experiment was divided into two parts: the ice melting observation experiment, in which ice cubes were melted to observe their melting rate, and the thermal resistance measurement experiment of the heated defrosting plate. The differences in different flow channels and filling ratio at 65%, 75%, and 85%, and melting times and total thermal resistance, spreading thermal resistance, and axial thermal resistance were compared. The results showed that the majority of curved loops in geometric shapes are centralized at the center of the defrosting plate. At a working fluid of 85%, the filling ratio showed better performance.


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