Patent ID: 7216696
Filing Date: 2007-05-15
Classification: F24B,F24D,F28D,Y02B

Abstract:
1. An external split heat exchanger comprising exchanger for preheating domestic water comprising: a flue pipe having gaseous hot air traveling therethrough; a shell comprising a pair of hollow joinable half cylindrical members, each said half cylindrical member joined to each other half cylindrical member along common longitudinally extending edges, each said half-cylindrical member having a separate hollow fluid flow chamber therein; each said fluid flow chamber having a water inlet end and a water outlet end; said shell being axially oriented with said flue pipe; said shell being smooth and unencumbered in an interior portion thereof; said hollow fluid flow chamber comprised of a longitudinal serpentine tubing section located within said shell; said longitudinal serpentine tubing section having an inlet adjacent a downstream end of said tubing section and an outlet adjacent an upstream end of said tubing section; said shell having a pair of respective openings accommodating said inlet and said outlet of said tubing sections therethrough; and, said split heat exchanger being placed over said flue pipe and fastened together.