摘要
针对混合工质组成及组份的在Lorenz循环中选择多样化的问题,对R290/R600a混合工质的主要物性参数、饱和蒸气压力、滑移温度特性进行了理论研究;通过对换热器最小有用能的分析,基于对数平均温差法针对非共沸混合工质与换热流体的温度匹配关系,建立了非共沸混合工质制冷系统的循环性能的计算方法。并与常规制冷剂制冷系统进行了性能比较。研究结果表明:R290/R600a在R600a质量分数为0.5时,相对常规制冷剂系统在空调工况下具有一定的节能潜力,而且运行压力较低。随着R600a质量分数的增加,制冷系统的COP先增加,后减小,在R600a质量分数为0.5时,COP值最大,而且高于其单质的制冷循环性能。该方法可为混合工质在不同工况下成分及组份的选择提供参考,也可为换热器的优化设计及变工况调节提供理论基础。
As for as the composition and component diversification choice problem of mixed refrigerant in Lorenz cycle,The main physical parameters,saturated vapor pressure and glide temperature characteristics of the R290/R600a mixture are studied in theory.Analyzing the minimum useful energy of the heat exchanger,based on the logarithmic mean temperature difference method of temperature matching between the non azeotropic mixture and heat transfer fluid.A method for calculating the cycle performance of a non azeotropic refrigerant system is established,and the performance is compared with that of the conventional refrigerant system.The results show that R290/R600a has a certain energy saving potential and low operating pressure when the mass of R600a is 0.5.With the increase of R600a mass fraction,the COP of the refrigeration system increases first and then decreases.When the mass of R600a is 0.5 the COP value is the maximum,and it is also higher than the refrigeration cycle performance with its single refrigerant.This method can provide reference for the selection of components and components under different working conditions,and also provide a theoretical basis for the optimal design of heat exchanger and the adjustment with variable conditions.
作者
余鹏飞
张小松
潘琪伟
肖勇
Yu Pengfei;Zhang Xiaosong;Pan Qiwei;Xiao Yong(School of Energy and Environment,Southeast University,Nanjing 210096,China;College of Energy and Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《科技通报》
2020年第2期59-64,共6页
Bulletin of Science and Technology
基金
国家自然科学基金(51520105009)
国家重点研发计划项目(2016YFC0700305)
南京工程学院科技创新项目(TB201803020)
