Study on Frost-Suppression Characteristics of Superhydrophobic Aluminum Surface Heat Exchanger Applied in Air Source Heat Pump

Yaxiu Gu, Guixiang He, Shuaipeng Li, Weiqi Ding, Hanlin Li and Jiahui Duan
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Yaxiu Gu: School of Civil Engineering, Chang’an University, Xi’an 710061, China
Guixiang He: School of Civil Engineering, Chang’an University, Xi’an 710061, China
Shuaipeng Li: School of Civil Engineering, Chang’an University, Xi’an 710061, China
Weiqi Ding: School of Civil Engineering, Chang’an University, Xi’an 710061, China
Hanlin Li: School of Civil Engineering, Chang’an University, Xi’an 710061, China
Jiahui Duan: Guangzhou Traffic Design and Research Institute Co., Ltd., Guangzhou 510000, China

Sustainability, 2022, vol. 14, issue 4, 1-17

Abstract: In order to solve the frosting problem of air source heat pump (ASHP) outdoor heat exchange under low-temperature and low-humidity conditions, a superhydrophobic aluminum (Al) surface with a contact angle (CA) of 158.3° was prepared by chemical etching. The microscopic characteristics of droplet condensation and the freezing process of a superhydrophobic surface were revealed through visual experiments and theoretical analysis. On this basis, the frost-suppression effect of a superhydrophobic Al-based surface simulating the distribution of actual heat exchanger fins was preliminarily explored. The results demonstrated that, due to the large nucleation energy barrier and the coalescence-bounce behavior of droplets, the condensed droplets on the superhydrophobic surface appeared late and their quantity was low. The thermal conductivity of the droplets on a superhydrophobic surface was large, so their freezing rate was low. The frosting amount on the superhydrophobic Al-based surface was 69.79% of that of the bare Al-based surface. In turn, the time required for melting the frost layer on the superhydrophobic Al-based surface was 64% of that on the bare Al-based surface. The results of this study lay an experimental and theoretical foundation for the application of superhydrophobic technology on the scale of heat exchangers.

Keywords: air source heat pump; superhydrophobic; antifrosting; defrosting; frost-suppression mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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