Rotary heat exchanger

A rotary heat exchanger through which a first fluid stream and a second fluid stream can flow along an axis in a counterflow configuration, the heat exchanger comprising:

• a frame;
• a partition in the frame having axially opposite end faces and formed on the axis with a circular cutout through which the streams flow axially oppositely;
• a rotor that extends axially through the cutout, that is rotatable about an axis in the frame, that passes through a first flow sector for the first fluid stream and a second flow sector for the axially oppositely flowing second fluid stream during a rotation, and that has a radially outwardly directed cylindrical edge surface,
• an L-section and flexible annular first seal having a part that extends axially and is fixed to the edge surface of the rotor and a part that extends radially and that is of such flexibility as to be pressed axially sealingly by the first fluid stream against the face of the partition directed upstream into the first fluid stream;
• and
• an L-section and flexible annular second seal having a part that extends axially and is fixed to the edge surface of the rotor and a part that is of such flexibility as to be pressed axially sealingly by the second fluid stream against the opposite face of the partition directed upstream into the second fluid stream.