Heat Transfer Characteristics of Micro-channel Condenser and Copper Pipe Condenser in Heat Pump Water Heater

doi:10.3969/j.issn.1000-1093.2015.06.027

Abstract

Abstract: For the small heat transfer contact area and low heat transfer efficiency between traditional outer-coil condenser and water tank, a micro-channel heat transfer technology is considered a prospect alternative to outer-coil condenser. The heat transfer characteristics and performances of two heat exchangers are compared experimentally. The results show that, for same heat pump system (except condenser), the average pressure drop of micro-channel condenser is 87% lower than that of copper pipe condenser in normal condition. The heating capacity of outer-coil micro-channel is relatively larger than those of outer-coil copper pipes, which is up to 37.5% in summer condition, 8.7% in normal condition and 19.6% in minimum condition. Exergy analytical calculation results show that the micro-channel condenser has better exergy efficiency than the other one, which is up to 20%.

Key words: engineering thermophysics, micro-channel, heat transfer, exergy

CLC Number:

TK513.5

WU Jiang-hong， LI Hui-xi， YOU Shao-fang. Heat Transfer Characteristics of Micro-channel Condenser and Copper Pipe Condenser in Heat Pump Water Heater[J]. Acta Armamentarii, 2015, 36(6): 1147-1152.

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