AIR PIT Russian patent published in 1995 - IPC

FIELD: air ducts; ventilation systems. SUBSTANCE: rectangular lateral cross-section air duct has heat-insulated walls and panel provided with air space; the panel is disposed at south side and is transparent to solar radiation. Screen made of heat conducting material is mounted at central part of the air duct in parallel to the panel. Surface of the screen which is turned to the panel and covered with light-absorbing layer. Cavity is made in the screen. The cavity is filled with heat-accumulating material. EFFECT: improved efficiency. 1 dwg