临界喷嘴式分流器改善冷库用翅片蒸发器性能的实验研究  

Experimental study on the performance of finned evaporator with a sonic nozzle splitter

作　　者：臧润清[1] 王汉青 孙志利[1] ZANG Run-qing;WANG Han-qing;SUN Zhi-li(Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134 , China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《热科学与技术》2019年第2期108-114,共7页Journal of Thermal Science and Technology

基　　金：天津市自然科学基金资助项目(16JCQNJC06600和15CBJC21600);天津市科技特派员资助项目(16JCTPJC62600)

摘　　要：对采用临界喷嘴式分流器的冷库用翅片蒸发器性能进行实验研究,在0、-4、-8、-12、-16、-18及-20℃七种不同环境工况下进行传热性能测试,并将测试结果与采用气液分离式分流器、CAL分流器和文丘里式分流器进行对比分析。研究结果表明:库温为0℃时,对应的翅片式蒸发器的制冷量和传热系数分别为8.5 kW和37.9 W/(m^2·℃),相比气液分离式分流器、德国CAL分流器、文丘里分流器其对应冷风机的制冷量分别提高了8.1%、17.4%和21.7%,传热系数提高了4.5%、13.9%和18.6%。库温为-18℃时,对应的翅片式蒸发器的制冷量和传热系数分别为5.5 kW和30.9 W/(m^2·℃),其对应的蒸发器的制冷量分别提高了7.2%、14.3%和18.7%。库温为-18℃时,对应的传热系数分别提高了0.9%、10.1%和13.2%。实验结论为有效提高翅片蒸发器性能提供了一种解决方案。The Experiments were carried out on the performance of the finned-tubed evaporator with the critical nozzle refrigerant distributor. The evaporator was tested at 7 different conditions, which were 0,-4,-8,-12,-16,-20, and -18 ℃. Then, the results were compared with CAL refrigerant distributor and Venturi refrigerant distributor. The research results show that when the temperature is 0 ℃, the cooling capacity of the evaporator is 8.5 kW, the heat transfer coefficient is 37.9 W/(m^2·℃), compared to the gas-liquid separation type diverter, Germany CAL shunt, cooling capacity the corresponding Venturi shunt evaporator are increased by 8.1%, 17.4%, and 21.7%, the heat transfer coefficient is increased by 4.5%, 13.9%, 18.7% and 0.9%, 10.1%, 13.2%. when the temperature were 18 ℃, the cooling capacity of the evaporator is 5.5 kW, the heat transfer coefficient is 30.9 W/(m^2·℃), The refrigerating capacity of the corresponding evaporator are increased by 7.2%, 14.3%, and 18.7%, the heat transfer coefficient is increased by 0.9%, 10.1%, 13.2%. The experimental results provide a solution for effectively improving the performance of finned-tubed evaporators.

关 键 词：临界喷嘴 分流器 冷风机 制冷量 传热系数 

分 类 号：TB657.9[一般工业技术—制冷工程]