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Condensation droplet self-driven away from nano-bionic interface has attracted the attention of the scientific community and industry in recent years, because this new heat and mass transfer interface can be used to design and develop high-performance phase-change thermal control devices to meet the growing demand for electronic devices. The demand for heat dissipation, the development of more energy-saving and environmentally friendly heat pump/air-conditioning heat exchangers and the development of other new energy-saving thermal control systems. It is well known that the fin surfaces of heat pump/air-conditioner heat exchangers are prone to defrost and block their narrow air ducts in low-temperature and humid environments. This problem will not only lead to a serious deterioration of the heat exchange efficiency of the heat exchangers, but also the existing high-energy heat exchangers. Depleting the defrosting with heat can also lead to a great waste of energy. Therefore, it is of great significance to solve this industry problem through the innovation of metal surface nano-processing technology and to develop a more energy-efficient air-conditioning/heat-pump heat exchanger.
Recently, Gao Xuefeng, a researcher at the Suzhou Institute of Nanotechnology and Nanobionics of the Chinese Academy of Sciences, presented and confirmed for the first time that the use of condensed droplets to remove nano-bionic interfaces and combined with intermittent micro-thermal air assisted heating can achieve continuous frost-free surfaces. Compared with the existing high energy heating defrosting technology, this new type of nano bionic technology and low energy consumption frost-free strategy can greatly reduce the energy consumption of air conditioning/heat pump operation. This combination of nano bionic technology and engineering technology Innovative ideas laid the foundation for the development of more energy-efficient air-conditioning/heat-pump heat exchangers. Related work has been published in the American Chemical Society's Applied Materials Interface magazine (ACS Appl. Mater. Interfaces 2014, 6, 8976-8980).
On this basis, how to develop a practical surface nanometer processing technology to give the self-removing function of condensed droplets on the surface of aluminum materials has become a technical problem that researchers urgently need to overcome. In response to this technical difficulty, they proposed a multi-step electrochemical anodic oxidation combined with chemical etching to realize the controllable preparation of anodized alumina rod-hole composite structure on aluminum surface, after chemical modification by low surface energy, Shows extraordinary small-scale condensation droplet self-removal. This breakthrough in aluminum surface nano-processing technology laid the foundation for the further design and development of more energy-efficient air-conditioning/heat pump aluminum wing heat exchangers. In particular, the output of air conditioners in China has accounted for more than 70% of the world's total output. Under the background of increasingly serious energy and environmental issues in China, the development of this new type of condensed droplet self-removal nano-aluminum material will be further developed in the future. Research and development of a new generation of more energy-efficient air-conditioning/heat-pump heat exchangers will be of great significance. Related work has been published in the Journal of Applied Materials, American Chemical Society (ACS Appl. Mater. Interfaces 2015, 7, 11079−11082). This work was supported by the National Major Research Program of the Ministry of Science and Technology, the key deployment project of the Chinese Academy of Sciences, the National Natural Science Foundation of China, and the President of the Suzhou Nanometer Institute.
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