毕业论文（设计）-60℃温区精馏型自复叠制冷系统R41替代R23的理论与实验研究.docxVIP

-60℃温区精馏型自复叠制冷系统R41替代R23的理论与实验研究摘 要 本文选取R1234ze(E)作为高沸点组分，对R41在-60℃温区二元精馏型自复叠制冷循环中替代R23进行了循环性能对比分析，设计并搭建了一个采用精馏型自复叠制冷循环的实验装置，对R23/ R1234ze(E)和R41/ R1234ze(E)混合制冷剂在系统中的循环性能进行了实验对比。理论分析和实验结果均表明：以R1234ze(E)作为高沸点组分时，用R41替代R23后系统COP略有下降，单位体积压缩功减小1/3-1/2，单位容积制冷量稍有降低，但是系统单位质量制冷量会明显提高，可以大大减小充注量。更重要的是，R41在GWP的显著减少能起到很明显的环境保护作用。关键词 制冷剂替代；精馏；自复叠；R41Theoretical and Experimental Studies on the Substitution of R41 for R23 in an Auto-cascade Refrigerator with a Rectifying Column at -60℃Song Qi1, Le Shengjian1, Lv Dongjie1, Wang Hui1, Xu Xiangguo1, Wang Qin1, Guo Zhikai2Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province,Institute of Refrigeration and Cryogenics, Zhejiang University, 3100272. Zhejiang Lantian Environmental Protection Hi-Tech Co. Ltd., 310023)(Tel: Email: wangqin@zju.edu.cn)Abstract R41 was selected to substitute for R23 in an auto-cascade refrigeration cycle with a rectifying column at -60℃. Performance comparison and analyses were conducted when R1234ze(E) was selected as the less volatile component. An experimental apparatus was designed and established to compare the performance of R23/ R1234ze(E) and R41/ R1234ze(E) in the system. Both theoretical and experimental results showed that when adopting R1234ze(E) as the less volatile component, COP values decreased slightly and the compression work per unit volume decreased by1/3-1/2 after the substitution of R41 for R23. Besides, the refrigeration capacity per unit volume also decreased slightly, but the refrigeration capacity per unit mass showed an obvious increase, which would result in significant refrigerant charge reduction. More importantly, the reduction in GWP of R41 would bring obvious environmental protection effect. 0 前言在深度制冷领域，R23是一种性能较好的制冷剂，对R23混合物的研究也较多。王勤等 [1]曾选取R23和R170的多组二元混合工质，通过理论计算对它们在-60℃温区一次分凝自复叠制冷循环中的性能进行了优化。结果发现，在给定的不同压比下，R23/R236ea混合工质的最佳COP均最大。他们还对二次分凝自复叠制冷循环和精馏型自复叠采用类似的混合制冷剂，在-60℃温区的性能进行了大量的理论计算分析[2,3]。R23的ODP为0，但是GWP却高达14760[4]，其替换工作迫在眉睫。R41的物理性质