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在船用制冷空调领域,制冷机组通常用海水作为冷却水冷却冷凝器中的制冷介质。为了提高冷凝换热管的抗海水腐蚀性能,船用冷凝器的管材常常采用Cu-Ni合金(如B10、B30等)或铝黄铜,这些材料往往导热性能较差[1,2]。本文通过Cu-Ni合金冷凝管的凝结换热性能测试和试验分析,指出低导热系数材料对凝结换热效果的影响不仅仅表现为管壁热阻,还弱化了强化管管外的凝结换热,通过影响换热性能的机理分析,提出了采用复合管技术进一步提高低导热材料冷凝管换热效果的设想。
In the field of marine refrigeration and air conditioning, the refrigeration unit usually uses seawater as the cooling medium in the cooling water cooling condenser. In order to improve the seawater corrosion resistance of condensing heat exchange tubes, the tubes of marine condensers are often made of Cu-Ni alloy (such as B10, B30, etc.) or aluminum brass. These materials tend to have poor thermal conductivity [1,2]. In this paper, the Cu-Ni alloy condensation tube heat transfer performance test and test analysis, pointed out that the low thermal conductivity of the material on the condensation heat transfer effect is not only reflected in the wall thermal resistance, but also weakened the enhanced tube outside the condensation heat transfer , Through the analysis of the mechanism that affects the heat transfer performance, the idea of using the composite pipe technology to further improve the heat transfer effect of the condensing pipe with low thermal conductivity material is proposed.