A simple solar air collector consists of an absorber material, sometimes having a selective surface, to capture radiation from the sun and transfers this thermal energy to air via conduction heat transfer. This heated air is then ducted to the building space or to the where the heated air is used for space heating or process heating needs. Functioning in a similar manner as a conve. The SolarWall design was developed in 1989 by John Hollick of Conserval Engineering with assistance from Natural Resources Canada and the 's (NREL). The system consists of perforated metal panels mounted on a building's sun-facing exterior wall, the panels absorb heat from the sun and in turn heat the air space between the panel and the building's wall. The heated air is then pulled into t.
