臺灣博碩士論文加值系統

台灣二元冷凍系統的應用廣泛，使用於空調、食品加工與冷藏、醫藥、化工、機械等等，近期更為重視，因此本論文利用市面上易購買的冷凍元件自行研製二元冷凍系統，針對膨脹閥之冷媒流量的不同進行探討。將系統中高、低溫循環系統個別以四種A、B、C及D膨脹閥測試，以求二元冷凍系統最佳的膨脹閥與性能係數。研究結果在高溫循環系統中因A、B、C膨脹閥之冷媒流量過小，導致低溫循環系統啟動時，高溫循環系統無法將中間冷卻器穩定於-30℃以下，低溫循環系統中也因A及B膨脹閥之冷媒流量過小，蒸發器也無法達到-80℃，且啟動C膨脹閥的蒸發器出、入口溫度相差過大，表示無法達到良好的冷凍效果，因此本論文二元冷凍系統之高、低溫循環系統皆啟動D膨脹閥可得性能係數0.45為最佳。

The cascade refrigeration systems are widely applied in Taiwan, for use in air conditioning, refrigeration and food processing, pharmaceuticals, chemicals, machinery, etc. More attention recently, So this thesis refrigeration components easily available in the market to buy the dual refrigeration system developed for conducted to explore various expansion valve of the refrigerant flow. The system of high and low temperature circulation system individually in four A, B, C and D expansion valve testing, in order to best binary refrigerating system expansion valve and the coefficient of performance. Results in a high temperature due to the circulatory system A, B, C the expansion valve of the refrigerant flow rate is too small, resulting in low temperature startup cycle, temperature cycle system can,t be stabilized at the intercooler below -30 ℃, the system also due to temperature cycling and A the flow of refrigerant expansion valve B is too small, the evaporator can,t reach -80 ℃, and start C expansion valve of the evaporator inlet temperature difference is too large, said it could not achieve a good cooling effect, this thesis high binary refrigeration system, hypothermic circulatory system are available starting D expansion valve coefficient of 0.45 for the best performance.

摘　要 i
ABSTRACT ii
誌　謝 iii
目　錄 iv
表目錄 vi
圖目錄 vii
第一章緒論 1
1.1研究背景 1
1.2文獻回顧 2
1.3研究目的 4
第二章二元冷凍原理及應用 5
2.1二元冷凍系統原理 5
2.1.1單級冷凍系統 5
2.1.2二元冷凍系統 7
第三章實驗系統配置與方法 10
3.1實驗系統與設備 10
3.1.1冷凍系統設備 10
3.1.2壓縮機 13
3.1.3冷凝器 15
3.1.4油分離器 17
3.1.5中間冷卻器 19
3.1.6液氣分離器 22
3.1.7膨脹閥 24
3.1.8蒸發器 25
3.1.9乾燥過濾器 26
3.1.10冷熱交換設計 27
3.1.11附屬元件 28
3.2實驗儀器與控制系統31
3.2.1控制系統 31
3.2.2實驗儀器 32
3.3實驗方法與步驟 34
第四章結果與討論 35
4.1控制系統設計 39
4.2高、低溫循環系統初步測試40
4.3膨脹閥測試 42
4.3.1高溫循環系統比較42
4.3.2低溫循環系統比較48
第五章結論與建議 54
5.1結論 54
5.2建議 54
參考文獻 55

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