Thermal and fluid dynamics behaviours in ventilated roofs and solar chimneys

Some of the most important requirements for building performance are energy saving and recovering, ventilated roof and solar chimney are good systems for energy purposes. In winter period, a ventilated roof helps to contain heat losses, and in summer period, it helps reducing the solar heat gain and improving the indoor thermal comfort.Solar Chimney allows to have a ventilation system in building environment as well as to obtain electrical energy. It employs solar radiation to raise temperature of the air and the buoyancy of warm air to accelerate the air stream flowing through the system. By converting thermal energy into the kinetic energy of air movement. Solar chimneys have a number of different applications such as ventilation, passive solar heating and cooling of buildings, solar-energy drying, and power generation.