標題: System performance of R-1234yf refrigerant in air-conditioning and heat pump system - An overview of current status
作者: Wang, Chi-Chuan
機械工程學系
Department of Mechanical Engineering
關鍵字: R-1234yf;R-134a;System performance;Heat pump;Air-conditioning
公開日期: 22-十二月-2014
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 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 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 refrigerant. Hence further adjustment of spring in the valve is required for soft optimization. (C) 2014 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.applthermaleng.2014.08.012
http://hdl.handle.net/11536/124255
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2014.08.012
期刊: APPLIED THERMAL ENGINEERING
Volume: 73
起始頁: 1412
結束頁: 1420
顯示於類別:期刊論文


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  1. 000347502300003.pdf