Exhaust flue heat exchange device

A heat exchange device interposed in an exhaust flue for extracting heat from a first medium passing through said flue and transferring that heat to a second medium, said device comprising:

• (a) a first chamber having an inlet and an outlet coupled to said flue for allowing said first medium to pass therethrough;
• (b) a second chamber having an inlet and an outlet for allowing said second medium to pass therethrough, said second chamber having a common boundary with at least a portion of said first chamber;
• and
• (c) guide means for causing said second medium to move between said inlet and outlet of said second chamber and over said common boundary between said first and second chambers, said guide means including baffle means for dividing the interior of said second chamber into at least a first subchamber and a second subchamber and including pipe means having at least one pipe member extending from said first subchamber of said second chamber through the interior of said first chamber and to said second subchamber of said second chamber for allowing said second medium to pass therethrough, said pipe means providing the only pathway for allowing the passage of said second medium between said subchambers, said pipe means preventing direct contact between said first and second mediums as said second medium passes through said interior of said first chamber;
• said baffle means including a plurality of baffle members mounted within said interior of said second chamber to divide said interior of said second chamber into at least first, second and third subchambers, each of said baffle members having first and second ends and an incline portion joining said first and second ends, said pipe means including at least a first pipe member extending from said first subchamber of said second chamber through the interior of said first chamber and to said second subchamber of said second chamber and a second pipe member extending from said second subchamber of said second chamber through the interior of said first chamber and to said third subchamber of said seciond chamber.

A heat exchange device mounted between first and second portions of an exhaust flue or a primary heat source for extracting heat from the exhaust gases of said primary heat source and transferring that heat to a secondary medium as said exhaust gases pass through said exhaust flue to supplement said primary heat source, said device comprising:

• (a) a first chamber having an inlet attached to said first portion of said exhaust flue and an outlet attached to said second portion of said exhaust flue for allowing said exhaust of said primary heat source to pass therethrough;
• (b) a second chamber having an inlet and an outlet for allowing said secondary medium to pass therethrough, said second chamber having a common boundary with at least a portion of said first chamber;
• and
• (c) guide means for causing said secondary medium to move between said inlet and outlet of said second chamber and over said common boundary between said first and second chambers, said guide means including a plurality of baffle members for dividing the interior of said second chamber into at least a first subchamber, a second subchamber and a third subchamber and including at least a first pipe member extending from said first subchamber of said second chamber through the interior of said first chamber and to said second subchamber of said second chamber for allowing said secondary medium to pass therethrough, and a second pipe member extending from said second subchamber of said second chamber through the interior of said first chamber and to said third subchamber of said second chamber for allowing said secondary medium to pass therethrough, said pipe members providing the only pathway for allowing the passage of said secondary medium between said subchambers;
• at least one of said baffle members having an incline portion for causing said second medium to move along an incline relative to the longitudinal axis of said first chamber.