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在蒸汽饱和温度为39℃,壁面过冷度为3~9℃条件下,实验研究了R407C在水平花瓣型翅片管和低肋管外的冷凝传热性能.结果表明,管外冷凝传热系数均随着壁面过冷度的增加而增大,在相同壁面过冷度下,花瓣型翅片管的管外冷凝传热系数是光滑管的4.6~5.4倍,比低肋提高了15%~25%,证明花瓣型翅片管具有良好的强化非共沸混合工质冷凝传热性能.
Under the conditions of steam saturation temperature of 39 ℃ and surface undercooling of 3 ~ 9 ℃, the condensation heat transfer performance of R407C was studied experimentally in horizontal petal-shaped finned tubes and low-finned tubes. The results show that the condensation heat transfer Coefficient increases with the increase of the degree of supercooling of the wall. Under the same degree of supercooling, the condensation heat transfer coefficient outside the tube of the petal-shaped finned tube is 4.6 to 5.4 times that of the smooth tube and 15% ~ 25%, prove that the petal-shaped finned tube has a good enhanced non-azeotropic mixed refrigerant condensing heat transfer performance.