本研究旨在開發一迴路式熱管系統，可整合進熱管理系統中做為主動式熱防護，利用主動式熱管理系統中的熱管系統，吸收來自外界的高溫熱能，以確保載具維持在適當的溫度範圍，避免載具溫度過高而損壞。在熱管系統的開發過程中，各設計環節環環相扣，必須挑選合適且相互匹配之工作流體、環路內各元件材質與毛細結構。經文獻指出與實際搭配實驗後，挑選水做為工作流體，管路材料則為不鏽鋼，毛細結構則是採用經由自行燒結而成的玻璃毛細蕊。實驗結果顯示本研究已經成功開發中高溫迴路式熱管，此迴路式熱管系統可在操作瓦數80瓦下(熱通量：3.11〖×10〗^(-4)W/m2)，其蒸發器表面溫度105.59℃，熱阻值為0.39℃/W。，最大操作瓦數480瓦下(熱通量：1.866〖×10〗^(-3)W/m2)，其蒸發器表面溫度484.92℃，熱阻值為0.477℃/W。此外本研究也測試此系統動態響應，研究結果顯示在高低落差瓦數的功率週期變動測試中，系統動態響應無過衝現象出現。而在冷凝器入口水溫測試方面，實驗後發現在系統啟始輸入瓦數越高時，選擇特定的冷凝器入口溫度可在不影響蒸發器表面溫度的前提下，有效的降低熱阻。本研究利用一低溫迴路式熱管穩態數學模型對系統狀態進行預測，在比較預測結果與實驗結果後，使用本研究之實驗數據，針對本實驗對模型進行修正，修正後在高輸入功率下能有效減少誤差。

In order to avoid damage to the vehicle due to excessive temperature during flight, the thermal protection technology in the thermal management system utilizes the heat pipe system in the active thermal management system to absorb high temperature heat from the outside to ensure that the vehicle is maintained at an appropriate temperature range. This thesis aims to develope a Loop Heat Pipe (LHP) system for intermediate and high temperature range heat protection system. Water was selected as the working fluid and sintered glass wick was placed in the evaporator to provide capillary pumping force. The experimental results show that the intermediate and high temperature LHP has been successfully developed. The LHP system can started-up under the power input 80 watts (heat flux: 3.11〖×10〗^(-4)W/m^2) and evaporator surface temperature is 105.59°C and the system thermal resistance is 0.39°C/ W. The evaporator surface temperature is 484.92°C and the system thermal resistance is 0.477°C/ W under the maximum input power 480 watts (heat flux: 18.66〖×10〗^(-4)W/m^2). In addition, Dynamic tests are evaluated in the system feasibility study. The results show that the system without overshoot in the dynamic test. In the condenser inlet water temperature test, it was found that in higher start-up wattage of the system, the specific condenser inlet temperature can effectively reduce the thermal resistance without affecting the evaporator surface temperature.

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