非共沸制冷剂在逆流换热器中温度窄点出现的判别方法  

Identification of pinch point in countercurrent heat exchanger for zeotropic refrigerant mixtures

作　　者：金星[1] 张小松[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2009年第4期848-854,共7页CIESC Journal

基　　金：国家科技支撑计划项目(2008BAJ12B00);东南大学优秀博士学位论文基金项目(YBJJ0814)~~

摘　　要：Pinch point and maximum temperature difference may occur in heat exchanger because of the non-linear relationship between the temperature and enthalpy of the zeotropic refrigerant mixtures in the two-phase region.The discriminant used to identify the pinch point or maximum temperature difference was presented by Venkatarathnam,but the discriminant can not be used to identify all the kinds of zeotropic refrigerant mixtures.The modified discriminant used to identify the pinch point and maximum temperature difference was obtained in this paper,which was proved by analyzing two zeotropic refrigerant mixtures.The results showed the possible concurrence of pinch point and maximum temperature difference in the heat exchanger.Pinch point and maximum temperature difference may occur in heat exchanger because of the non-linear relationship between the temperature and enthalpy of the zeotropie refrigerant mixtures in the two-phase region. The discriminant used to identify the pinch point or maximum temperature difference was presented by Venkatarathnam, but the discriminant can not be used to identify all the kinds of zeotropic refrigerant mixtures. The modified discriminant used to identify the pinch point and maximum temperature difference was obtained in this paper, which was proved by analyzing two zeotropic refrigerant mixtures. The results showed the possible concurrence of pinch point and maximum temperature difference in the heat exchanger.

关 键 词：非共沸制冷剂 温度滑移 窄点 

分 类 号：TB61[一般工业技术—制冷工程]