R1234yf/RE170混合工质用于汽车空调的可行性

目前汽车空调常用的制冷剂四氟乙烷(R134a)存在较高的温室效应指数(GWP=1 300),会对环境造成不利的影响。将R1234yf和RE170以质量配比为70:30组成新型混合制冷剂(代号NCUR04)应用于汽车空调中,通过热力学性质、环境特性、循环性能、安全特性、润滑特性方面综合考虑替代R134a的可行性,并与潜在替代制冷剂R1234yf进行对比。研究表明:NCUR04环境性能、热力学性质较R134a和R1234yf优异;单位质量制冷量分别比R134a和R1234yf高24.7%和66.2%;单位容积制冷量比R134a低4.5%,比R1234yf高5.9%;能效比(COP)分别比R134a和R1234yf高1.4%和8.8%;排气温度比R134a低2.4℃,比R1234yf高5.5℃;与POE润滑油互溶性良好。因此,NCUR04替代R134a用于汽车空调具有可行性。

Feasibility of using R1234yf/RE170 mixture as alternative for R134a in automotive air conditioner

Refrigerant(R134 a) frequently used in automotive air conditioning has adverse impact on environment due to high Global Warming Potential(GWP=1 300). The application of R1234 yf and RE170 mixed with the mass ratio of 70:30(named NCUR04) in automotive air conditioning was proposed. The feasibility of NCUR04 as alternative for R134 a was studied from the aspects of thermodynamic property, environment performance, cycle characteristic, safety performance and lubrication characteristic, and the properties of NCUR04 compared with alternative refrigerant R1234 yf. The results show that NCUR04 has more excellent environment performance and thermodynamic property than R134 a and R1234 yf. Its refrigeration capacity per unit mass is 24.7% higher than R134 a, 66.2% higher than R1234 yf while the refrigeration capacity per unit volume is lower 4.5% than R134 a, 5.9% higher than R1234 yf, the cycle performance coefficient(COP) is 1.4% higher than R134 a, 8.8% higher than R1234 yf. Its discharge temperature is 2.4 ℃ lower than R134 a, 5.5 ℃ higher than R1234 yf. The compatibility of NCUR04 with POE lubricating oil is good. Therefore, NCUR04 has the feasibility to replace R134 a in automotive air conditioner.