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Feasibility Study of the Ф5 Tube-and-fin Heat Exchanger in Automotive Heat Pump System

Wei Wei1 Zhao Yu1 Chen Jiangping1 Song Ji2 Gao Yifeng2(1.Inst.of Refrigeration and Cryogenics,Shanghai Jiao Tong Univ.,Shanghai,200240,China;2.International Copper Association Shanghai Office,Shanghai,200020,China)  
The parallel flow microchannel(PFM) heat exchanger is widely used in automotive air conditioning system,but it has the disadvantage of easy-frost and difficult in water-drain in defrost.The traditional tube and fin heat exchanger can overcome the frost and defrost problem but has low efficiency.In this paper a Ф5 tube and fin heat exchanger is developed for the automotive heat pump.Performances of small diameter tube-and-fin heat exchanger and PFM heat exchanger are compared based on benchmark test.Results show that the system with small diameter tube-and-fin heat exchanger has 17.4%~23.7% higher COP in air conditioning mode,12.6%~35.8% higher COP and 15~28℃ lower compressor discharge temperature in heat pump mode,which indicates that small diameter tube-and-fin heat exchanger is a promising solution to the automotive heat pump system of electric vehicle.
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