Simulation design of fin parameters and defrosting experiment for microchannel heat exchanger
SONG Fenping
WANG Xiaoyu
XIE Ligao
DONG Chao
ZHAO Rijing
HUANG Dong
Abstract：To study the possibility of the microchannel heat exchanger(MHX)replacing the fin-tube heat exchanger(FHX)in heat pump air conditioning systems,a simulation analysis of the composite fins used in the MHX is conducted,and the effects of the louver angle and wave height on the flow and heat transfer was studied.The results show that when the air velocity is below 2.3 m·s-1,a louver angle of 28° is optimal.A wave height of 1.0 mm is superior to 0.8 mm and 0.6 mm.Subsequently,the system defrosting performance of the outdoor unit using vertical-fined MHX and FHX is tested.The defrosting process is divided into the start-up,melting,and drainage stage.The total defrosting time of the MHX is 276 s,which is 45 s(19.5%)longer than that of the FHX.The duration of melting stage is 1.58 times that of the FHX,but the duration of the drainage stage does not increase significantly.
Keywords：Microchannel heat exchangerComposite finDefrosting
Publication Date：2025-10-31
Online Publishing Date：2026-03-06(First online date of this platform, not the publication date of the document)
Pages：6( 94-99 )