Preliminary study of a novel defrosting method for air source heat pumps based on superhydrophobic fin》.pdfVIP

Applied Thermal Engineering 90 (2015) 136e144 Contents lists available at ScienceDirect Applied Thermal Engineering journal homepage: /l ocate/apthermeng Research paper Preliminary study of a novel defrosting method for air source heat pumps based on superhydrophobic fin * Feng Wang, Cai-Hua Liang , Ming-Tao Yang, Xiao-Song Zhang School of Energy and Environment, Southeast University, 2 Sipailou Road, Nanjing 210096, PR China h i g h l i g h t s A novel defrosting method for ASHPs is proposed based on superhydrophobic fin. Its mechanism and realization process are analyzed. Preliminary experiments are performed to verify its feasibility. It can avoid the disadvantages of current defrosting methods. a r t i c l e i n f o a b s t r a c t Article history: Current defrosting methods for air source heat pumps always implement defrosting in the frost layer Received 10 May 2015 growth period. As a result, the heating performance decays because of the frost layer growth, and large Accepted 4 July 2015 amounts of energy and time are consumed to melt the frost layer. Moreover, the heating cycle is interrupted Available online 13 July 2015 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, Keywords: the frosting process can be c