External flue heat exchangers

Details External flue heat exchangers External flue heat exchangers

2007-05-15

2007-05-15

Duong, Tho (Department: 3744)

Heat exchange

Non-communicating coaxial enclosures

Helical conduit means

C165S163000

Reexamination Certificate

active

10842067

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.

REFERENCES:
patent: 4235286 (1980-11-01), Behlau
patent: 4381819 (1983-05-01), Paolino
patent: 4509588 (1985-04-01), Parham
patent: 4887586 (1989-12-01), Walters
patent: 5385299 (1995-01-01), Zawada
patent: 5680770 (1997-10-01), Hall et al.
patent: 6068047 (2000-05-01), Buchhave
patent: 6572370 (2003-06-01), Hampden
patent: 58160795 (1983-09-01), None

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