In this paper

triangular winglets strengthening the unsteady natural convection flow and heat transfer

which were set up on the collector surface in the solar chimney power plant system

was researched with numerical methods. The number of ribs

rib inclination and arrangement influence on the temperature and velocity difference of the airflow between the inlet and outlet were analyzed. And heat effects of the triangular winglets were evaluated combining with the principle of field synergy. The results show that:With air flowed through the triangular winglets

the temperature gradient increases

the heat transfer is enhanced

the temperature and velocity difference of the airflow between the inlet and outlet increases sharply. As the number of ribs increased

the synergy angle between velocity and temperature gradient decreased because the disturbed effect enhanced

but energy loss increased as the flow friction increased

and when rib inclination is 45°

the velocity difference between inlet and outlet is the largest. With triangular winglets arranged in the vertical rectangular channel

staggered arrangement is better than the aligned.