本研究主旨在於計算膨脹閥調整控制對蒸發過程熱流特性之影響，並考慮冷媒在蒸發器裡蒸發過程中之壓降，探討外均壓式膨脹閥調整對蒸發過程熱流特性之影響，進而提出相關設計理論基礎為目的。
在本論文中分別探討了不同的膨脹閥大小以及不同的膨脹閥預壓量對整個冷凍系統的影響，並分成實驗數據之趨勢觀測以及數值模擬計算部分，並建立一套完整的研究方法，來探討調整膨脹閥在冷凍系統中造成效率影響之機制。

在實驗結果中包含了數據的量測結果以及觀察膨脹閥的開度與系統中相關參數之變化趨勢。在數值的計算上包含了蒸發器、膨脹閥、壓縮機之單一以及系統匹配之相關數學方程式推導，並完成系統匹配後蒸發器內局部熱流特性的計算，以及收斂後之質量流率。

結果顯示，數值計算以及實驗數據之趨勢相當吻合，膨脹閥的鎖緊程度大約在4.5 ~ 5.5圈 (大約佔總開度的0.72 ~ 0.88) 蒸發器吸熱能力為最佳。

The scope of this research is concerned with the calculation of flow and heat transfer characteristics in evaporating for the adjustment and control of the expansion valve. The pressure drop during evaporation was considered and discussion of the effects of using external equalizer expansion valve on the flow and heat transfer characteristics of evaporation was used to form the basic of design theories.
This thesis discussed the effect of having different capacity and different volume pre-compression expansion valve on the entire refrigeration system. A trend formed from the experimental results and the calculation of numerical simulations is included. This allows the establishment of a complete research method to discuss the influence of efficiency with regulate of expansion valve for refrigeration system.

The result included the data from the experimental measurements and observations made on the trend change of parameters with the rate of expansion valve opening in the system. In numerical simulation, there are separate deductions of mathematical equations for the evaporator、the expansion valve and the compressor as well as a complete refrigeration system consisting of these components. We also obtained calculations for the flow and heat transfer characteristics and the converged mass flow rate.

The results revealed good agreement between numerical simulation and experimental measurements. The best absorption point is about in 4.5 ~ 5.5 degrees of closed (about in 0.72 ~ 0.88 of all opening rate).

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