Journal
ENERGY AND BUILDINGS
Volume 223, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2020.110134
Keywords
Frost thickness; Defrosting; Hydrophobic fin; Superhydrophobic fin; Nanostructure
Funding
- National Natural Science Foundations of China [51676033, 51978599]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJB470037]
- Green Yang Jin Feng Project of Yangzhou City
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The effect of initial frost thickness on dynamic defrosting was studied on vertical hydrophobic (HF) and superhydrophobic (SHF) fin surfaces, respectively, which may further deepen the understanding of defrosting and promote application of surface treatment to deal with the frosting of ASHP. In the experiments, frost layer broke down into blocks with melting after a long time preheating, and formed water droplets on the HF surface with strong shrinkage. The preheating time and total defrosting time all increased with the increase of frost thickness. And the size and distribution density of melting water droplets were different, because of the influence of frost thickness on frost-water movement. Peeling off of frost layer appeared on the SHF surface, no matter how thick the frost layer was. The key to achieve peeling off was the action of air thermal expansion in the enclosed space formed by nanostructures of SHF surface and frost layer. Theoretical calculation showed that defrosting temperature decreased with the increase of nanostructure height or decrease of nanostructure diameter. Thus, defrosting temperature could be reduced by optimizing the nanostructure size of SFH surface to save defrosting energy consumption or find low temperature heat source for ASHP defrosting. (c) 2020 Elsevier B.V. All rights reserved.
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