高效管在制冷系统中的蒸发传热性能研究

发布时间：2018-07-08 18:01

本文选题：烧结型表面多孔管 + 翅片管　；参考：《华东理工大学》2015年硕士论文

【摘要】：采用高效传热管可显著提高制冷系统中能源的利用效率。本文制备了烧结型表面多孔管和翅片管两种形式的高效管,对其结构参数进行了表征。烧结型表面多孔管的力学性能和工艺性能均符合相应的标准,满足空调系统中的应用要求。以R134a为介质,通过单管实验台研究了多个制冷工况下,烧结型表面多孔管、翅片管和光管的蒸发传热特性。试验结果表明,在各个工况下,烧结型表面多孔管的管外传热系数和总传热系数均优于光管及翅片管,管外传热系数相比光管提高了8倍,相比翅片管提高了1倍。建立了两种高效管的热流密度q和管外传热系数ho之间的传热关联式,具有较好的工程应用价值。烧结型表面多孔管相比于制冷系统中广泛使用的翅片管,具有更优的传热性能,可以进一步实现高效化和紧凑化,在制冷领域中具有广阔的应用前景。
[Abstract]:The efficiency of energy utilization in refrigeration system can be improved by using high efficiency heat transfer tube. In this paper, sintered surface porous tubes and finned tubes were prepared and their structural parameters were characterized. The mechanical and technological properties of the sintered surface porous tube meet the requirements of air conditioning system. The evaporative heat transfer characteristics of sintered surface porous tube, finned tube and light tube under several refrigeration conditions were studied by using R134a as the medium. The experimental results show that the external heat transfer coefficient and total heat transfer coefficient of the sintered surface porous tube are better than those of the light tube and the finned tube under various working conditions. The heat transfer coefficient outside the tube is 8 times higher than that of the light tube, and the heat transfer coefficient is 1 times higher than that of the finned tube. The heat transfer correlation between heat flux Q and heat transfer coefficient ho of two high efficiency tubes is established, which has good engineering application value. Compared with the finned tube widely used in refrigeration system, the sintered surface porous tube has better heat transfer performance and can further achieve high efficiency and compactness. It has a broad application prospect in the field of refrigeration.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB611;TB657

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