Abstract:In order to reduce the pressure of national electricity grid and responding to the off-peak electricity utilization policy:GB 50736-2012,a solid heat storage device is designed according to the national civil building heating standard.Different numbers of circular and elliptical channels are set up on the heat storage device,and by using numerical calculation to solve the project.The effects of pore shape and number on the heat storage device's heat discharge characteristics were investigated with the condition of natural convection.The results show that the temperature of the center line and the outlet temperature of the ellipse channel is obviously higher than that at the corresponding position in the circular channel.While the shape of the hole is the same,large channel numbers make the center temperature of the hole higher,thus more beneficial to heat discharge performance of solid heat storage device.The bigger the hole number is,the smaller the velocity of the center is.However,the pore shape has little effect on the center speed.At the beginning of the heat release,the outlet temperature of the elliptical hole is higher than that of the circular hole.While about 1.4 hours later,the outlet temperature of the elliptical hole begins to be lower than that of the circular hole,and the number of holes has little effect on the outlet temperature.The exit temperature of circular hole changes more slowly with time.