探討HFO-1234yf及HC-600a替代HFC-134a冷媒之可行性分析研究

Evaluating the Feasibility of HFO-1234yf and HC-600a as Substitutes for HFC-134a

璩敬賢(Ching-Hsien Chu)

指導教授 ： 卓清松

國立臺北科技大學/機電學院/冷凍空調工程系所/碩士(2013年)

摘要

本研究目的為探討新世代冷媒HFO-1234yf及自然冷媒HC-600a替代HFC-134a冷媒之可行性分析。實驗中以HFC-134a冷凍循環系統分別搭配不同電子式膨脹閥所對應之冷媒參數，以比較各冷媒系統間的性能數據差異。實驗結果顯示，與HFC-134a冷媒系統相較之下，HFO-1234yf冷媒系統的平均製冷與製熱能力降為90%及95%、平均製冷及製熱性能係數為100% 及 105%、平均壓縮機排氣溫度下降約4℃及壓縮比為98%；HC-600a冷媒系統平均的製冷與製熱能力皆降為64%、平均製冷及製熱性能係數為104%及103%、平均壓縮機排氣溫度下降約8.1℃及壓縮比為84%。系統年耗電部分的二氧化碳排放當量結果，HFC-134a為142.66公斤；HFO-1234yf 138.93公斤；HC-600a則為89.60公斤。綜合本研究結果，以HFO-1234yf汰換HFC-134a冷媒而言，不論是以調整膨脹閥設定或直接汰換的方式，皆使得系統的能力與性能系數約保有原系統的90%以上；以HC-600a汰換HFC-134a冷媒而言，系統性能係數雖能有提升，但能力卻降至64%。本研究所使用的HFO-1234yf冷媒，確實能在既有設備狀況下直接汰換使用，並能保持接近原HFC-134a系統的運轉能力。

關鍵字

HFC-134a ； 冷媒汰換 ； 全球暖化潛勢(GWP) ； 電子式膨脹閥

並列摘要

The study aims to explore analysis on feasibility of replacing HFC-134a refrigerant by new-generation HFO-1234yf refrigerant and natural HC-600a refrigerant. In the experiment made, HFC-134a refrigeration and circulation system is attached with the corresponding refrigerant parameters of different electronic expansion valves so as to compare the difference in performance data among the various refrigerant systems. Experimental results show that compared to HFC-134a refrigerant, the average refrigerating and heating capacity drops of HFO-1234yf refrigerant system are 90% and 95% respectively; its average refrigerating and heating coefficients of performance (COP) are 100% and 105% respectively; the average compressor exhaust gas temperature drop is around 4oC; and the compression ratio is 98%. But for HC-600a refrigerant system, the average refrigerating and heating capacities are both reduced to be 64%; the average refrigerating and heating COPs are 104% and 103% respectively; the average compressor exhaust gas temperature drop is around 8.1oC; and the compression ratio is 84%. Regarding annual power consumption of the system, as seen from the measurement results of carbon dioxide emission, HFC-134a is 142.66 kg; HFO-1234yf is 138.93 kg; and HC-600a is 89.60 kg. After synthesis of the research results of the study, for replacement of HFC-134a refrigerant by HFO-1234yf refrigerant, no matter via adjustment of expansion valve setting or direct replacement, the capability and COP of system can secure over 90% of the original system. But for replacement of HFC-134a refrigerant by HC-600a refrigerant, although the COP of system can be raised, its capability falls to 64%. The HFO-1234yf refrigerant used by the study can really be perform direct replacement for use in the existing equipment, and can keep its operational capability close to that of the original HFC-134a system.

並列關鍵字

HFC134a ； refrigerant substituting ； global warming potential(GWP) ； electronic expansion valve(EEV)

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