冰箱用箱壁式冷凝器的热路分析

Heat path analysis for hot-wall condensers of household refrigerators

为了对冰箱冷凝器结构的优化设计提供理论依据,利用通用有限元软件ANSYS对箱壁式冷凝器进行了建模、求解。在分析中,考虑了铝箔对传热的影响;同时,考虑到在通常情况下冷凝管和冰箱的外壁平板之间的线接触会影响冷凝器的散热。因此,对冷凝管与箱壁平板的线接触进行了改进,采用凹槽结构的接触形式,并分析接触角度对散热的影响。结果显示:铝箔在冷凝管的散热中是一个重要的热路,如果不考虑铝箔的影响,计算所得的换热量将偏小8%左右;冷凝器的管材对换热效果影响不大,采用铜管比钢管的换热效果增大不到1%;增加冷凝管与外壁的接触面积可以提高换热效果,但是增加幅度并不明显;同时计算结果也表明,冷凝器通过发泡层传入冰箱内部的热量约占冷凝器总负荷的12%。

To improve structure of hot-waft condensers used in domestic refrigerators, sets up a new heat discharge analysis model using the finite element software ANSYS. Employs a groove contact type between condenser tubes and iron plate. Studies the influents of aluminum foil, as well as the contact length on the heat transfer. It is proved that the aluminum foil is an important heat path for the condenser＇s heat transfer and could not be neglected, if not taking into account of the aluminum foil, the calculation results will decrease by about 8 % ; compared with the steel tubes, the heat transfer of hot-wall condenser with copper tubes increases less than 1% ; the contact length between the condenser tubes and iron plate couldn＇t evidently influent the heat exchange between the condenser and surroundings. It also presentes that the heat transfer through the foam to refrigerator＇s the inside wall is about 12% of the overall condensation load.