超疏水换热器抑霜/化霜性能的实验研究

超疏水表面可有效抑制结霜，但其在换热器尺度的制备及抑霜/化霜研究较为缺乏，限制了超疏水改性技术在解决空气源热泵结霜问题上的应用。为获取超疏水换热器的抑霜/化霜性能，通过对常规翅片管换热器进行溶液刻蚀和表面氟化，整体化制备了超疏水换热器。搭建了换热器结霜/化霜实验系统，对比研究了亲水、常规和超疏水换热器的结霜与化霜特性。结果表明：在相同实验工况下结霜60 min，超疏水换热器的结霜量比亲水和常规型分别减少了18.0%和38.6%；化霜时，得益于霜层从翅片表面直接剥落，超疏水换热器的化霜时间短、能耗低。

Experimental Study on Anti-frosting/Defrosting Performances of Superhydrophobic Heat Exchanger

Superhydrophobic surface can effectively inhibit frosting, but its application in the scale of heat exchanger and the study on its anti-frosting/defrosting behaviors are relatively lacking, which limits the application of superhydrophobic modification technology in solving the frosting problem of air source heat pump. In order to get the anti-frosting/defrosting performances of superhydrophobic heat exchanger, fin-tube heat exchanger with superhydrophobic surface was prepared integrally in this paper by etching bare unit in solution and then surface fluorinating. A frosting/defrosting experimental system was constructed to study the frosting and defrosting processes on heat exchangers with different surface characteristics. Experimental results showed that the frost mass on the superhydrophobic unit was reduced by 18.0% and 38.6% compared with that of the hydrophilic and bare units, when frosting 60 min under the same experimental conditions. In the aspect of defrosting, because of the direct peeling of the frost layer from fin surface, the superhydrophobic unit had short defrosting time and low defrosting energy consumption.