Comparison of test results for flat plate, transpired flat plate, corrugated, and transpired corrugated solar air heaters
Five selective-black-metal plate experimental air heaters with and without transpiration were designed, fabricated, and tested to compare their technical merits. All were 61 cm * 61 cm (2 ft * 2 ft), double-glazed with low-iron glass, and those with transpiration contained an additional Teflon film to form a plenum above the absorber plate. The results show the magnitude of technical improvement that can be obtained through the slotting, perforating, and corrugating strategems. 26 refs.