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題 名 | R-1234yf冷媒在空調和熱泵系統的性能--現況回顧=An Overview of the System Performance of R-1234yf Refrigerant in Air-conditioning and Heat Pump System |
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作 者 | 王啟川; | 書刊名 | 臺灣能源期刊 |
卷 期 | 1:3 2014.06[民103.06] |
頁 次 | 頁301-313 |
分類號 | 446.641 |
關鍵詞 | 系統性能; 熱傳導; 熱泵; 空調系統; R-1234yf; R-134a; System performance; Heat transfer; Heat pump; Air-conditioning; |
語 文 | 中文(Chinese) |
中文摘要 | 本文回顧R-1234yf與R-134a系統性能現有研究的差異比較。根據現有的研究,直接使用R-1234yf置換R-134a系統的性能衰退大約在0-27%,並取決於操作條件。隨著引進內部熱交換器、噴射器或膨脹器,或調整感溫式膨脹閥,性能衰退化可以舒緩,甚至可以變得與R-134a系統相若。對於蒸發器的傳熱性能,R-1234yf的與R-134a的幾乎相同,然而,在冷凝器中R-1234yf的性能明顯低於R-134a。R-1234yf的容積效率比R-134a稍低,這是因為R-1234yf有較高的摩擦壓降。對於相同的感溫式膨脹閥,用於控制同樣的過熱度,R-1234yf系統需要更進一步調整最佳化的彈簧在膨脹閥內的鬆緊程度。 |
英文摘要 | In this study, an overview of the system performance of R-1234yf in association with R-134a is carried out. Based on the existing researches, it is found that the COP and heat capacity of R-134a system may suffer from direct drop-in replacement of R-1234yf. The deterioration of system performance is around 0~27% depending on the operational conditions. With the introduction of internal heat exchanger, ejector, expander, or adjustment of the thermal expansion valve, the deterioration can be relieved., and a comparable performance becomes likely. For the heat transfer performance in the evaporator, R-1234yf is almost comparable with that of R-134a. However, the performance in the condenser is inferior to R-134a. The phenomenon may be quite severe for a water cooled condenser since the dominant thermal resistance may fall in the refrigerant side. The volumetric efficiency of R-1234yf system is slightly lower than that of R-134a due to higher frictional pressure drop of R-1234yf. For the same thermal expansion valve for controlling the suction superheat, it appears that higher suction superheat may occur for R-1234yf. Hence further adjustment of spring in the valve is required for optimization. |
本系統中英文摘要資訊取自各篇刊載內容。