Abstract: The fan system based on the dual bypass design in the aviation field is applied in room air conditioners to solve the wind problem of single type fan and can effectively improve the comfort of the human body. But no relevant research on the dual engine heat exchange system design coupled with double bypass fans was found worldwide. In order to study the couple design method of dual engine heat exchange system, this paper has carried both numerical simulation and experimental research to obtain the optimal speed ratio parameters of the upper and lower fans of the double bypass fans system under different load conditions. Simultaneously, new heat exchanger structure parameters and refrigerant distribution are investigated to enhance the heat exchange efficiency and improve the energy efficiency level to meet the energy-saving needs of users.

Key words: Double bypass, Numerical simulation, Experimental research, Dual engine heat exchange system, High energy efficiency