External flue heat exchangers
OwnerJoseph C. Ferraroinventor
Life of this patent
Estimating the term…
Abstract
A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger reduces fuel use, pollution and wear of the furnace and burner. A typical heat exchanger installation includes an oil or gas burner located on a furnace or boiler having a flue pipe leading to a gaseous outlet, such as a masonry chimney. A short vertical flue section leads to a draft-regulating damper. The flue heat exchanger may be a coil of tubing wrapped around flue section, such that the tubing picks up heat from the heated flue gasses. Preheated water exits from the heat exchanger.
Claims12
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.
Dependencies are inferred from the claim text.