Transpired Solar Collector
The solar air heating technology was first patented in 1990 by Peter R. Hollick . The concept is simple. In order to create a thermal layer that traps warm air, the sun heats a dark-colored perforated metal panel that is offset from the building envelop. As fresh air is drawn through the perforations, the warm air is then used in conventional air handling units that distribute air into the building. This technology is best suited for buildings that require high ventilation rates and have large volume spaces. By preheating the air, this technology saves money and energy. This can be especially beneficial for a building that requires hot air for processes such as crop drying. The panels should have over 240 perforations per square foot and made out of aluminum or zinc in order to prevent corrosion. Metal panels installed four to eight inches from the wall, are usually corrugated for extra rigity and dark-colored for maximum solar gain. Installation is simple and can be installed over any non-combustible wall construction including openings. South facing is the ideal orientation r ecommended for this application. However, Southeast and Southwest walls will result in a one to ten percent loss in efficiency, while a west or east facing wall will lose ten to thirty percent efficiency. Heat that would normally be lost through outer walls is recaptured by the transpired solar collector and recirculated. In summer, panels act as solar shades, protecting the building from direct solar heat gain.
Atas International, Energy Efficient Building Envelop Technology.“ AIA/CES/ GBCI Presentation. Atas International.
Florida, Orlando. 16 Aug 2013. Lecture.
U.S. Department of Energy. National Renewable Energy Laboratory. Transpired Collectors