Solar collector for gas heating

Claim 1

In heat transfer structure, the combination comprising a. a sandwich assembly including a heat transfer plate to receive infra-red radiation or to transmit such radiation, respectively to or from skyward, b. the assembly defining an enclosed gas flow chamber at the underside of said plate, there being spaced air inlet and outlet ports respectively to and from the chamber, the chamber having lengthwise spaced opposite ends from which said ports are spaced in a lengthwise direction, and c. baffling in said chamber to direct gas passing through the chamber via said ports to freely flow tortuously and with turbulence adjacent major extent of the underside of said plate, said baffling including first multiple elongated baffles associated with the inlet port and divergent generally in said lengthwise direction toward one end of the chamber closest the inlet port thereby to initially direct gas flow entering the chamber via said inlet toward said one end of the chamber, for subsequent endwise flow back toward the opposite end of the chamber, and second multiple elongated baffles associated with the outlet port and divergent generally in said lengthwise direction toward the opposite end of the chamber closest the outlet port thereby to subsequently direct gas flow traveling lengthwise of the chamber and then proximate said opposite end of the chamber generally back toward the outlet to exit the chamber via said outlet.