本研究對現有分置式史特靈冷凍機進行性能改善，以熱傳效果佳之氦氣取代空氣作為工作流體，並建立一數學模型以預測實際冷凍機製冷行為。由動力模式計算壓縮活塞和移氣器的位置函數，接著求出各腔室之體積、質量及壓力後，透過能量方程式加上可能發生之熱力損失得到各腔室溫度及製冷頭無負載溫度，並考慮有熱負載情況下製冷溫度的變化，進一步求得性能係數，另外針對轉速分析其對溫度與相位角之影響找出最佳操作轉速，實驗方面則架設可量測實體冷凍機溫度與性能之量測系統，最後將理論模擬與實驗結果相互比較以作為未來設計改良之參考。本研究發展之分置式史特靈冷凍機，於環境溫度為27°C時，在馬達轉速維持2000 rpm、工作流體為5 atm氦氣之操作條件下，可獲得約109 K之無負載製冷溫度。

In this study, a split-type Stirling cooler with free floating displacer is analyzed by theoretical model. Volume, mass and pressure in different chambers are predicted as the transient varying positions of the piston and the displacer are obtained by means of a dynamic model. The temperature of the cold head is evaluated with the help of energy equation, which includes a variety of thermodynamic losses. Coefficient of performance can be determined as heat load is applied on the cold head. On the other hand, a prototype cooler using helium as the working gas is developed, which is able to achieve a no-load temperature of 109 K at operating speed of 2000 rpm and pressure of 5 atm.

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