拜半導體技術進步之賜，使得電腦效能得以快速發展，但伴隨而來的高發熱量問題也日漸嚴重。為解決這個問題，本論文著手研究水冷散熱系統，以期待對於熱量問題的解決有所助益。
　　本論文共分為四個主題來做探討：(1) 水冷散熱系統各控制因子對散熱效益的影響力比較；(2) 氣冷、熱管與水冷散熱系統之散熱效益比較；(3) 桌上型電腦實際安裝水冷與氣冷散熱系統之散熱效益比較；(4) 考慮水冷散熱系統的參數設計，與散熱效益的變化情形。
　　研究結果顯示，各控制因子對散熱效益的影響力順序為：風扇轉速>水槽水量>管路內徑>管路長度>散熱膏k值>環境溫度，而水冷液種類與管路落差則是可忽略的。如果將此結果運用在市售電腦上，由電源線供電的筆記型電腦，雖然採用較小空間來設計散熱模組，侷限了一些控制因子之操作，但因配合提高風扇轉速，使得其散熱系統的系統熱阻仍可低於CPU降頻運轉中的桌上型電腦。另外，由電池供電的筆記型電腦，雖然必須降低風扇轉速來節約電力，但因配合CPU的降頻，使得其CPU穩態溫度仍可低於由電源線供電的筆記型電腦。
　　實驗結果也證實，散熱效益順序為：水冷＞熱管＞氣冷。且發現散熱系統之系統熱阻並非定值，而是隨著發熱模組消耗功率的增加而呈線性緩緩降低。

　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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