Recuperative heat exchanger of ceramic material

A recuperative heat echanger, comprising:

• an elongated body comprised of ceramic material and having a longitudinal axis;
• said body having an outer surface spaced away from said axis;
• a plurality of flow channels extending through said body along the axis of said body for flow of fluid medium through said channels axially of said body;
• each said flow channel being slot-shaped in a cross section through the axis of said body, with a long dimension extending outwardly of said axis;
• said flow channels being placed next to each other, and being arranged around the axis of said body;
• with dividing walls separating neighboring said flow channels;
• adjacent said flow channels being interleaved;
• alternate said flow channels forming two alternating groups, a first group arranged so that its flow channels jutting past the second group of flow channels with which they alternate and extend further toward said surface of said body;
• the second group of flow channels extending further toward the axis of said body than the first group with which they alternate;
• first inlet and outlet openings being provided for said first group of said flow channels about at the axial ends of said body, and second inlet and outlet openings for said second group of said flow channels being provided about at the axial ends of said body, whereby different media involved in heat exchange may respectively flow in said first and said second flow channels, respectively.