Heat exchange using phase change material

A heat exchange device for transferring heat between at least two fluid streams and a phase change material, the device comprising:

• a first extrusion comprising a plurality of first receptacles;
• a second extrusion separate from the first extrusion and comprising a plurality of second receptacles;
• a first fluid stream channel configured to receive and direct at least a portion of a first fluid stream of the at least two fluid streams through the heat exchange device, the first fluid stream channel being disposed between the first extrusion and the second extrusion;
• a second fluid stream channel configured to receive and direct at least a portion of a second fluid stream of the at least two fluid streams through the heat exchange device, the second fluid stream channel being disposed on an opposite side of the second extrusion from the first fluid stream channel;
• heat conductive foam inserts disposed in each first and second receptacles of the plurality of first receptacles and the plurality of second receptacles, wherein:
• each heat conductive foam insert comprises a shape that matches shapes of the first and second receptacles;
• and
• each heat conductive foam insert comprises a plurality of parallel grooves to allow for expansion and contraction of the heat conductive foam insert;
• the phase change material impregnating the heat conductive foam inserts;
• and
• a brazing or solder filler metal layer disposed on an inside surface of the first and second receptacles between the heat conductive foam inserts and the inside surface of the first and second receptacles;
• wherein each heat conductive foam insert disposed in the plurality of second receptacles of the second extrusion is configured to transfer heat between the first fluid stream and the second fluid stream.