Abstract: The 24-hour inherent energy consumption coefficient of water storage electric water heater has a great impact on the energy efficiency grade of products. In order to study the method of improving the energy efficiency grade, the fluid solid coupling heat transfer simulation of water storage electric water heater is carried out, the optimization direction of reducing the 24-hour inherent energy consumption coefficient of electric water heater is analyzed, and several specific solutions are provided. The effectiveness of the scheme is verified by the established CFD simulation analysis method. The optimization scheme of liner support can effectively reduce the 24-hour inherent energy consumption coefficient by 0.008. The two schemes of reducing the liner by 1 mm and moving the liner down by 1 mm can effectively reduce the 24-hour inherent energy consumption coefficient by 0.024 and 0.015, respectively.

Key words: Numerical simulation, Electric water heater, The 24-hour inherent energy consumption coefficient, Energy efficiency