This paper investigated the relationship between the auxiliary heating and the tower type chimney height in solar chimney power system.Aimed at lowering the chimney height so as to reduce the construction cost

assumption that reheating the ascending hot gas flow inside the stack to enhance the internal energy of gas

raise the flow speed and increase the chimney draft was proposed.Taking the Wuhai desert solar chimney power system as the research object

under the condition of constant chimney differential pressure and bottom entrance flow rate

the optimal auxiliary heating flow temperature is 90 ℃

and the optimal tower type stack height is of 80 m

the reheating position should be inside the stack and of 50 m high from the ground.