摘要

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.