Abstract
Heat pipe used in electronic component cooling mechanisms become popular increasingly, such as the traditional heat pipes, loop heat pipe, pulsating heat pipe, etc. This study is the use of a pulsating heat pipe excellent features to produce high performance products. Pulsating heat pipe is a new type of cooling technology, it has arbitrary length and continuous by using of the capillary loops and bends enough into many different shapes, mainly by the gas-liquid two-phase actuation principle. It can be effectively conducted heat source from the high temperature to the low temperature area, which is a highly efficient energy the heat transfer device. Due to pulsating heat pipe is simple structure can be arbitrarily curved excellent features, it has been found to be widely used, that beyond the traditional heat pipe and has excellent heat transfer characteristics. According the advantages by using the above properties, we can develop the principle of application to use in defrosting plate for the fresh meat or frozen food. We choice Aluminum plate which has low thermal resistance and high performance in thermal conduction, then using CNC machining to carve the fluid loop channel of pulsating heat pipe for the two-phase working zone, and the filling working fluid is methanol. Discuss the different geometry、 filling rate of defrosting plate to find out the excellent specifications and fastest defrosting ice melt time, the experiment also the use of UV irradiation TiO2 photocatalyst, the resulting hydrophilic properties, it can easily make the ice-melting water to spread around in the plate, trying to increase the water covered in defrosting plate area. The experiment proved the both type 1001-plate that having the large number of loop and the filling rate in 85%, which has better performance in ice-melting (the rate is 0.0612 [g / s]) of the ice dissolution rate, In addition to the type 1001-plate also has the lowest in total thermal resistance (0.039[oC/W] ) than Aluminum plate under the condition in FR-85% and 9W. The coated TiO2 on defrosting plate in ice-melting time is faster than uncoated defrosting plate about 30 seconds. It show the proof about after the photocatalytic plate surface can be better in defrosting performance due to the hydrophilic properties. In the other hand, in UV LED inhibiting biological growth in experimental exposure dose at about 11.61 (J/day), which is about 2.5W of daily exposure to UV LED 45 minutes to reach significant inhibitory effect.