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Experimental study on frost suppression performance of super-hydrophobic surface.

Number: pap. n. 365

Author(s) : GU Y., WANG X., GONG Z., et al.

Summary

There is an inevitable frost phenomenon on the surface of evaporator when the air source heat pump (ASHP) is operating for heating in cities which have cold and wet winter. And the frost formation will decrease the Coefficient of Performance (COP) of ASHP. The used common defrosting modes for ASHP consume the indoor energy, and make a negative effect on the indoor thermal comfort. The super-hydrophobic technology on fabrication of super-hydrophobic surface is improved in this paper. The super-hydrophobic aluminum-based surface with an average contact angle of 154.6° was prepared by chemical etching and fluoroalkylsilane modification. An experimental system for frost suppression was set up. The frosting and defrosting properties of super-hydrophobic aluminum surface and conventional aluminum surface at temperatures ranging from 0 °C to –15 °C and wind speeds ranging from 1 m/s to 3 m/s were studied. It is concluded that the super-hydrophobic surface can effectively inhibit the formation of condensate droplets and frost layer, and has good drainage property, and wind speed has little effect on the formation of frost layer. Results show that the frost suppression performance of super-hydrophobic surface is obviously better than that of bare aluminum surface. And the super-hydrophobic aluminum surface is more suitable for restraining frost formation because of its preferable performance of retarding frost formation and drainage characteristics.

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Details

  • Original title: Experimental study on frost suppression performance of super-hydrophobic surface.
  • Record ID : 30026409
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0365

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