本研究之目的在設計與製造出一具平板蒸發器之迴路式熱管，並將加壓燒結的毛細結構應用在系統上。當系統設計完成後，經由理論原理計算系統管路壓降，再以實驗的方法來研究系統的熱傳特性，其中包括啟動測試、最佳工質填充量、冷凝器性能變化、熱洩漏改良、風扇轉速搭配等參數進行一系列實驗分析，同時針對在低發熱功率時不易啟動穩態的現象作了研究探討。結果如下：
（1）壓降理論計算結果顯示，最大壓降為重力壓降，其次分別為毛細壓降、液相工質流動壓降、彎管壓降、汽相工質流動壓降。
（2）工作流體水的注入量在26.5㏄時，高瓦數的散熱表現最佳，但在低瓦數時則不易啟動。
（3）在相同流量不同靜壓的風扇條件下，低靜壓的風扇在高發熱量的散熱性能較佳；而在相同靜壓不同流量的情形下，高流量風扇對高發熱量負載的效果則比低流量風扇好。
（4）降轉速、減少工質填充量、加裝補償室散熱裝置，為有效解決低瓦無法穩態問題的方法。
（5）冷凝器風扇轉速的大小對高發熱量負載的性能影響較大，而補償室風扇轉速的大小對低瓦負載的影響較大，實驗過程當中，最佳熱阻值在發熱量100W時為0.367℃/W。

This study’s main purposeis to design and fabricate a LHP with the
flat evaporator and the pressurized, sintered wick. After finishing the
system’s design, the piping pressure-drop was calculated by applying the
related theory. Afterwards, a series of the experiments were conducted to
study the thermal characteristics of LHP. The emphases are focused on
the start-up test, the optimum amount of working fluid, the various
condenser performances, improvement on heat-leakage, and the influence
associated with different fan speeds. In the meantime, the unsteady
situation under the low heat loading was also discussed extensively in this
study. The experimental results are listed as follows:
(1) The theoretical calculations showed that the priorities of the influence
on the system pressure-drop are the gravity, the wick pressure-drop,
the liquid pressure-drop, the elbow pressure-drop, and the vapor
pressure-drop.
(2) The 26.5 ㏄ amount of working fluid can yield the best thermal
resistance (0.367 ℃/W) for the LHP under the high-power-dissipation
(100W) situation. However, a difficulty on start-up is observed under
this amount of working fluid.
(3) Under the same flowrate situation, the low-pressure fan results in a
better heat-dissipating ability. Also, for the same static-pressure
condition, a larger airflow generates a superior thermal performance.
(4) Reducing fan speed, decreasing the amount of working fluid, adding
heatsink on compensation chamber are effective to solve the stating
problem of the LHP under the low power loading.
(5) The rotation speed of cooling fan attached on the condenser has a
strong influence on LHP thermal performance under high power
loading; nevertheless, the rpm of cooling fan on the compensation
chamber presents a substantially effect on LHP with a lower-power
loading.

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