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目前常用的R22的替代制冷剂主要是R410A,R417B等。虽然它们的ODP值为0,但是其GWP值较高,属于过渡替代物。本文提出了一种新型低GWP三元混合制冷剂,该制冷剂(简称NC01)由R1234ze(E)/R134a/R32组成,通过REFPROP9.0分析确定质量混合比为17%/33%/50%。用该软件对NC01的环境性、热物性、循环性进行了分析。NC01的ODP为0,GWP为755,环境性能良好,GWP比R22降低了57%。临界温度、临界压力、饱和压力、COP等性能参数与R22比较接近,容积制热量比R22高。在水源热泵机组进行了灌注式试验,与被替代制冷剂R22进行了对比。结果显示:当冷水进水在12℃~23℃时,新型混合工质在排气温度比R22高2℃~3.6℃,相应的压比比R22高8.6%~14.8%,加热量提高5%~11%,COP比R22平均低约4.5%,加热速率比R22约提高9%;当冷水进水高于23℃时,COP值超过R22。最后对试验结果与理论计算值进行了比较,两者吻合较好。研究可为类似混合工质替代R22研究提供参考。
Currently used R22 alternative refrigerant is mainly R410A, R417B and so on. Although their ODP values are 0, their high GWP values are transitional substitutes. In this paper, we propose a novel low GWP ternary mixed refrigerant (NC01) consisting of R1234ze (E) / R134a / R32, whose mass mixing ratio is 17% / 33% / 50% by REFPROP9.0 analysis. . With the software NC01 environmental, thermal properties, recycling were analyzed. NC01 has an ODP of 0 and a GWP of 755, with good environmental performance and a 57% reduction in GWP over R22. The critical temperature, critical pressure, saturation pressure, COP and other performance parameters are close to R22, and the volumetric heating capacity is higher than R22. In the water source heat pump unit perfusion test, compared with the refrigerant R22 was replaced. The results show that when the cold water inflow is between 12 ℃ and 23 ℃, the temperature of exhaust gas is 2 ℃ ~ 3.6 ℃ higher than that of R22, the corresponding pressure ratio is 8.6% ~ 14.8% higher than that of R22, and the heating capacity is increased by 5% 11%, COP lower than R22 average about 4.5%, heating rate increased by about 9% R22; when the cold water influx above 23 ℃, the COP value exceeds R22. Finally, the experimental results and theoretical calculations were compared, the two agree well. The research can provide a reference for the researches on substituting R22 for similar mixed working fluids.