Preliminary study of a novel defrosting method for air source heat pumps based on superhydrophobic fin
Preliminary study of a novel defrosting method for air source heat pumps based on superhydrophobic fin
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DOI：
10.1016/j.applthermaleng.2015.07.003
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发表时间：
2015-11
影响因子：
6.4
通讯作者：
Wang Feng;C. Liang;Yang Mingtao;Xiao-song Zhang
中科院分区：
文献类型：
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作者：
Wang Feng;C. Liang;Yang Mingtao;Xiao-song Zhang
现有的空气源热泵空调系统的制冷方法都是在霜层生长期进行制冷。结果，由于霜层的生长，加热性能下降，并且消耗大量的能量和时间来融化霜层。此外，当加热循环开始时，加热循环被中断，这导致不连续的加热。霜层是在结霜初期形成的霜胚表面上形成和生长的。如果及时去除胚胎，可以切断结霜过程。因此，本文提出了一种结合超疏水翅片表面特性和高速热气流的综合疏水方法。分析了其工作机理和实现过程，并进行了初步实验验证其可行性.当高速热气流作用于翅片表面时，由于超疏水表面的弱粘附性，大部分胚胎被气流瞬间吹走。只有少量的小胚胎留在表面上，这些胚胎在3.5秒内迅速蒸发。初步结果表明，该方法是可行的，可以避免现有的反演算法的缺点。
Current defrosting methods for air source heat pumps always implement defrosting in the frost layer growth period. As a result, the heating performance decays because of the frost layer growth, and large amounts of energy and time are consumed to melt the frost layer. Moreover, the heating cycle is interrupted when defrosting cycle starts, which leads to discontinuous heating. Frost layer forms and grows on the surfaces of embryos which form in the initial stage of frosting process. If the embryos are removed timely, the frosting process can be cut off. Thus, a comprehensive defrosting method, which combines surface characteristic of superhydrophobic fin and high-speed hot airflow, is proposed in this paper. Its mechanism and realization process are analyzed, and preliminary experiments are performed to verify its feasibility. When the high-speed hot airflow acts on the fin surface, most of the embryos are instantaneously blown away by the airflow due to the weak adhesion of the superhydrophobic surface. Only a few small embryos remain on the surface, which are evaporated quickly in 3.5 s. Preliminary results indicate that the novel defrosting method is feasible which can avoid the disadvantages of current defrosting methods.