| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 94 === With the progress of semiconductor technology, the computer performance is promoted rapidly, but it's also becoming serious in the heat-dissipation problem. In order to solve this problem, this work studied the water-cooling system, which is expected to be helpful to the heat-dissipation of computer.
This thesis is partitioned into four subjects: (1) the influence comparison of different controlled parameters in a water-cooling system, (2) the comparison of thermal performance of air, heat-pipe and water cooling systems, (3) the comparison of thermal performance of water- and air-cooling systems in a personal computer, (4) the parameter design of water-cooling system and the related variation of thermal performance.
According to the analysis results, the influence sequence of controlled parameters on thermal performance is fan speed > amount of water in the tank > internal diameter of tube > length of tube > k value of thermal compound > ambient temperature, and the effects of coolant type and the height drop of tube could be ignored.
The analysis results can be applied to the real computers. Since the power-line-supported notebook uses very small space to design a cooling system, the varying ranges of controlled parameters will be limited. However, according to the analysis results, the thermal resistance of the cooling system could be lower than that of a CPU-frequency-decelerated desktop computer by increasing the fan speed. Besides, a battery-supplied notebook would save power by slowing down the fan speed, but its' steady CPU temperature could be lower than that of a power-line-supplied notebook by slowing down the CPU frequency.
It's also verified in the study that the sequence of thermal performance of cooling system is water-cooling > heat-pipe cooling > air-cooling. The thermal resistance of a cooling system isn't a fixed value, and it becomes smaller as the power consumption of CPU increases.
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