The solar collector uses conventional steel siding painted black to absorb solar radiation. The siding was installed over the existing south wall with approximately two inches of fiberglass insulation. A clear fiberglass reinforced plastic cover was mounted 8 to 12 inches in front of the siding.
Fresh air enters the bottom of the panels where it is heated as it passes over the warm absorber.
Fifteen fan units distributed the air evenly throughout the south end of the plant via 3,200 feet of flexible ducting. The Chicago plant has received many long-term benefits in addition to energy savings. The system not only provides clean fresh air for its employees, but it also reduces the production of carbon dioxide from the combustion of fossil fuels. Other results show a warmer south end of the plant, with hot and cold spots evened out. Ventilation air preheating for an automobile parts stamping plant 2.