Theoretical and Experimental Study of Superhydrophobic Frost Suppression Heat Transfer Performance of Evaporator for Air Source Heat Pump
Superhydrophobic surfaces exhibit excellent frost inhibition performance,and a super-hydrophobic surface with a contact angle of 156.7° is prepared in this paper.A visualisation test bench was established to compare the similarities and differences in the processes of wet air conden-sation and droplet freezing on one-dimensional finned surfaces with different wettability with those of three-dimensional finned tubes in terms of frost formation and frost melting.By modelling the wet air condensation and droplet freezing on the cold surface,the frost suppression mechanism of the superhydrophobic surface at the early stage of frost formation is revealed.The total droplet thermal resistance of the superhydrophobic surface is about 5.94 times that of the ordinary surface,and the amount of frost is reduced by 18.9％and the frosting efficiency is improved by 21.2％for the superhydrophobic finned tube compared with the ordinary finned tube.This study lays the experimental and theoretical foundation for the application of superhydrophobic technology on the heat exchanger scale.
superhydrophobic frost suppressionair source heat pumpheat transfer performancedroplet condensationdroplet freezing
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