US Patent 8733427 Multifluid heat exchanger

A heat exchanger has a pair of heat exchange conduits having adjacent primary heat exchange surfaces thermally coupled together for the transfer of heat energy between the conduits. A third fluid conduit has a primary heat transfer surface thermally coupled to the primary heat transfer surfaces of the pair of fluid conduits, so that heat can be transferred between any one of the fluid conduits and each of the other fluid conduits.