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

中文关键词: 临界喷嘴  分流器  冷风机  制冷量  传热系数

英文关键词: sonic nozzle  distributor  air cooler  cooling  capacity  heat transfer coefficient

中文摘要:

      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8.5kW，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5.5kW，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。

英文摘要:

      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 conditons,which were 0,-4,-8,-12,-16,-20,and -18℃.Then, the results are 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 8.5kW,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 were 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 were 5.5kW,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.