流体机械

2019, v.47;No.570(12) 67-71

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直接冷却系统与间接冷却系统的对比研究
A Comparative Study of Direct Cooling System and Indirect Cooling System

马燕;臧润清;闫璟敏;
Ma Yan;Zang Runqing;Yan Jingmin;Tianjin University of Commerce,Tianjin Key Laboratory of Refrigeration Technology,Refrigeration Engineering Research Center of Ministry of Education of P.R.C,Tianjin Refrigeration Engineering Technology Center;

摘要(Abstract):

为测得间接冷却系统与直接冷却系统的性能对比,对两者进行了相关试验,研究不同库温、载冷剂流量的工况下2种制冷系统漏冷量、传热系数等性能参数的差异。结果表明,间接冷却系统制冷剂充注量比直接冷却系统减少536.3 g。但漏冷量更多,并随库温升高、载冷剂流量减少而降低,在库温-15 ℃时,2种制冷系统漏冷量最小相差161.06 W。随库温升高,直接冷却系统传热系数及制冷量会升高,而间接冷却系统传热系数及制冷量随库温升高而减小,载冷剂流量增加而加大。-15 ℃的库温下2种制冷系统制冷量相差了610.46 W,而增大冷却器换热面积可使其达到直接冷却系统相同的制冷量。因此增大换热面积,选择最佳载冷剂流量对于提高间接冷却系统的制冷效率极为重要。
To measure and compare the performance of indirect cooling system and direct cooling system,a comparative experiment was conducted between the two systems in order to study the differences of performance parameters such as cooling leakage and heat transfer coefficient between the two refrigeration systems under different storage temperature and flow rate of the secondary coolant.The results show that the refrigerant charging amount of the indirect cooling system was 536.3 g less than that of the direct cooling system.But there was more leakage,and it decreased with the increase of temperature and decrease of coolant flow,at temperature of 15 ℃ in the cold storage,the difference in cool leakage quantity between the two refrigeration system was 161.06 W.The heat transfer coefficient and refrigerating capacity of the direct cooling system would increase with the temperature rise of the storage room,whereas the heat transfer coefficient and refrigerating capacity of the indirect cooling system decreased with the increase of the temperature of the cold storage,and flow rate of the secondary coolant increased.At temperature of 15 ℃ in the cold storage,difference in refrigerating capacity between the two systems was 610.46 W,whereas increasing the heat transfer area of the cooler could achieve the same cooling capacity of the direct cooling system.Therefore,it is very important to increase the heat transfer area and select the optimal flow rate of the secondary coolant for improving the cooling efficiency of the indirect cooling system.

关键词(KeyWords): 直接冷却;间接冷却;性能参数;换热面积
direct cooling;indirect cooling;performance parameters;heat transfer area

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作者(Author): 马燕;臧润清;闫璟敏;
Ma Yan;Zang Runqing;Yan Jingmin;Tianjin University of Commerce,Tianjin Key Laboratory of Refrigeration Technology,Refrigeration Engineering Research Center of Ministry of Education of P.R.C,Tianjin Refrigeration Engineering Technology Center;

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