蒸发器流路优化对重力再循环制冷系统性能的影响  

Effect of evaporator flow path optimization on the performance of gravity feeding refrigeration system

作　　者：臧润清 王赫 ZANG Run-qing;WANG He(Refrigeration Engineering Research Center of Ministry of Education,Tianjin University of Commerce,Tianjin 300134,China;Tianjin Refrigeration Engineering Technology Center,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学冷冻冷藏技术教育部工程研究中心,天津300134 [2]天津商业大学天津市制冷技术工程中心,天津300134

出　　处：《热科学与技术》2018年第4期296-300,共5页Journal of Thermal Science and Technology

摘　　要：对于给定结构的蒸发器，其换热效率是由蒸发器的再循环量决定的，再循环量则与制冷剂种类、蒸发温度、供液压头以及制冷剂管传入热量（热虹吸动力）等有关。根据数学模型设计出一种翅片管蒸发器，并对其进行优化，研究在不同工况温度及其相应循环倍率下，蒸发器内管路流程布置方式对制冷系统各性能参数的影响。结果表明，流程重新布置后蒸发器的传热系数K比原蒸发器提高15．57％～22．77％，比原蒸发器在直接膨胀供液系统中的传热系数提高了86．59％～138．22％，制冷量和COP分别最高提高了21．24％和55．49％。The heat exchange efficiency of an evaporator with determined structure is decided by recycle quantity of evaporator, which is connected with the type of refrigerant, evaporation temperature, liquid pressure head, and heat input of refrigerant pipe （thermal-siphon power）. According to the mathematical model, a fin tube evaporator is designed and optimized. The influences of the pipeline arrangement on the performance parameters of the refrigeration system are studied under different operating temperatures and the corresponding cycle rates . The results show that the heat-transfer coefficient of the optimized evaporator has increased 15.57%-22.77% than that of evaporator before optimization and increased 86.59%-138.22% than that of direct expansion refrigeration system. The highest increasing rate of the refrigerating capacity and COP are respectively 21.24% and 55.49%.

关 键 词：重力再循环制冷系统 蒸发器流路 循环倍率 制热能效比 

分 类 号：TB61[一般工业技术—制冷工程]