非共沸混合制冷剂组分对冷凝器换热特性的影响  

Effect of zeotropic refrigerant mixtures composition on heat transfer characteristics of condensers

作　　者：冯永斌[1] 晏刚[1] 钱文波[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《低温工程》2009年第6期52-56,共5页Cryogenics

摘　　要：为了揭示非共沸混合工质在冷凝器内的换热特性,探明非共沸混合工质组分对制冷剂和换热流体间沿程温度的影响,通过建立冷凝器换热模型,对不同沸点差的二元环保型非共沸混合工质进行了理论分析。结果表明:由于非共沸混合工质比焓值与温度的非线性关系,换热流体间的沿程传热温差出现极值点;混合工质中富含低沸点组分时,冷凝器内部存在最小传热温差;反之,存在最大传热温差;混合工质沸点差增加,滑移温度的限制条件之差增大,窄点现象增强。In order to reveal the heat transfer characteristics of zeotropic refrigerant mixtures in condenser and ascertain the effect of mixtures composition on temperature distribution change between refrigerant and heat transfer fluid, theoretical analysis was carried out with different normal boiling point temperature difference and environment-friendly refrigerant mixutures based on an condenser model. The results show that the temperature difference of fluid takes on extreme point due to the non-linear relationship between temperature and specific enthalpy during the condensing process. With binary mixtures, a minimum temperature difference will occur within the ends of the condenser when the concentration of low voliatile fluid is high. Maximum temperature difference behaviour will be seen at low concentrations of the more volatile fluid. The constraint temperature difference of glide temperature will increases and the pinch point behaviour will be strengthen when the normal boiling point temperature difference of mixture refrigerant increases.

关 键 词：制冷剂 非共沸 冷凝器 组分 

分 类 号：TB612[一般工业技术—制冷工程]