Heat recuperator with triple pass cross-flow ceramic core

Claim 1

A heat recuperator comprising a ceramic core comprising ribbed layers, the core having an air-in face and an air-out face, the core also having a hot-gas-in face and a hot-gas-out face and, in addition, two solid faces, the direction of flow of air through the core being orthogonal to the direction of flow of hot gas through the core, the layers through which air flows being separated by divider ribs into three sections so that the air passes thrice through said layers, the core being disposed within a metal housing having an air-in side and, opposite thereto, an air-out side, said air-in and air-out sides having cast ceramic material thereat having landed surfaces thereon in gasket-sealing correspondence with the perimeters and divider rib edges of the respective air-in and air-out faces of the core, the housing having a hot-gas-in side and, opposite thereto, a hot-gas-out side, said hot-gas-in and hot-gas-out sides having cast ceramic material thereat having landed surfaces thereon in gasket-sealing correspondence with the perimeters of the respective hot-gas-in and hot-gas-out faces of the core, the housing having two closed sides, said closed sides being in correspondence with the solid faces of the core, and means within the housing for applying compression to said two solid faces.