空调用翅片管式换热器腐蚀及防护研究进展

A Review of Studies on Corrosion and Protection of Finned Tube Heat Exchanger for Air Conditioner

空调用翅片管式换热器长期使用会受到一定程度的腐蚀,影响换热器的换热性能,导致整个空调系统的能效降低。本文介绍了翅片管式换热器3种主要的腐蚀机理:蚁巢腐蚀、点蚀和间隙腐蚀,从形貌、压降及传热特性3个方面分析了腐蚀对翅片管式换热器性能的影响,结果表明:翅片管式换热器腐蚀后,传热系数和换热量均减小,空气侧压降受影响较小,在5 Pa以内。总结归纳了翅片管式换热器抗腐蚀性的研究现状,发现改善换热器抗腐蚀性能的研究集中于制备出耐腐蚀性更好的防腐涂层。最后,总结和展望了制冷空调换热器腐蚀防护的研究方向。

The finned tube heat exchanger used in air conditioners becomes corroded after long-term use.This affects the heat exchange performance of the heat exchanger and reduces the energy efficiency of the entire air conditioning system.In this review,three main corrosion mechanisms of finned tube heat exchangers were introduced:ant-nest corrosion,pitting corrosion,and gap corrosion.The influence of corrosion on the performance of the finned tube heat exchanger was analyzed from three aspects:morphology,pressure drop,and heat transfer characteristics.The results show that the heat transfer coefficient and heat transfer of the finned tube heat exchanger decreased after corrosion.The air-side pressure drop was less affected(<5 Pa).The research status of corrosion resistance of finned tube heat exchangers is summarized.It was found that research on improving the corrosion resistance of heat exchangers focused on the preparation of better corrosion-resistant coatings.Finally,future research directions for corrosion protection of refrigeration and air conditioning heat exchangers are summarized and discussed.