Abstract: The research object of this paper is the air duct of a commercial heat pump water heater. In order to achieve a refined design and reduce the early design of the detour, we have carried out a simulation analysis on the fan duct part of this product and optimized the design of the heat exchanger. In this paper, the flow field distribution of the original product was obtained through CFD simulation analysis, and Suggestions on improving the flow field of the evaporator were given to improve the heat transfer effect of the evaporator and improve airflow uniformity, so as to realize the improvement of energy efficiency of the capacity under the same air volume. Finally, experiments were carried out on the products according to the improvement Suggestions, and the effectiveness of some structural improvements was verified, which proved that the CFD simulation analysis could indeed guide the product design.

Key words: CFD, The simulation, Heat pump