The numerical simulation of heat transfer and flow characters in power generation system with hot air flow provided from solar energy and in the heat-accumulating layer has been carried out.The mathematical model of heat transfer and flow in heat-collecting shed

chimney

and inside the heat-accumulating layer has been established

the influence of solar radiation upon the heat-accumulating performance of said layer being analysed.Result of calculation shows that the soil has thermal inertia and stronger heat-accumulating effect;there is a large fluctuation of average temperature at the surface of heat-accumulating layer and at the outlet of chimney along with the elapse of time;and the fluctuation of average temperature at surface of the heat-accumulating layer is more remarkable;the average temperature of heat-accumulating medium and the heat-dissipating amount of said system are also fluctuating along with the elapse of time.The energy loss from ceiling of the heat-collecting shed can be decreased by using double-layer glass or membrane materials.