第五章 結論
5.2 未來展望
4. 本軟體可以設定蒸發溫度與冷凝溫度為設計條件，但是卻沒考慮 外界溫度以及蒸發器和冷凝器的熱交換效率，未來可以加入此部 分，讓本軟體可以不僅僅針對壓縮機這部份，可以進一步對整體 冷機循環進行模擬與效能分析，成為功能更強大的效能模擬軟體。
參考文獻
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[3] Lavelle, J., “U.S. Refrigerant Issues”, ASHRAE Journal, September, pp. 20-24, 2000.
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147, 1992.
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附錄A CO
2循環
臨界溫度(31.1۫C)以及在常溫下的工作壓力遠高於一般冷媒。低臨界溫 度會造成在循環時高壓端的溫度會超過臨界溫度，如圖A.2 所示。此 時CO2處於超臨界的狀態，以變溫的方式與外界做熱交換，跟一般 冷媒藉由相變化而定溫熱傳的方式不同，由於超臨界下的物質狀態相 當難以掌控，溫度改變使得變因更多(例如壓力會不會隨之改變)，因 此在此部分的設計上相當重要。而高壓會使得壓縮機使用壽命減短；
但根據研究指出[22]，高壓也帶來優勢，例如可以使用更細的導流 管，這使得其他部分的設計彈性更大。
CO2作為冷媒最大的優勢在於他的高熱比容，大約是其他冷媒的 五~八倍，(請見圖 A.3 中之 R744)。而高熱比容使得 CO2跟其他冷媒 相比可以以較少的冷媒流率達成同樣冷凍能力，所以汽缸可以設計的 比較小，這與由於高壓下可以使用較細導流管互相搭配，便可使得整 體的機構縮小很多。也因而在最近的汽車市場上，以CO2為冷媒的 空調系統越來越多。
圖A.1 一般冷機循環 P-h 圖
圖A.2 CO2與一般冷媒循環比較
圖A.3 冷媒各種性質比較