Secondary heat exchanger for condensing furnace

Details Secondary heat exchanger for condensing furnace Secondary heat exchanger for condensing furnace

1998-08-31

1999-12-28

Yeung, James C.

Stoves and furnaces

Hot-air furnaces

Compressed air

126 99R, 1651341, 165177, 29890053, F24H 302

Patent

active

060067411

ABSTRACT:
A secondary heat exchanger suitable for use in a condensing furnace which is in the form of a bank of a plurality of metal tubes which are positioned in a plurality of stacked rows. The tubes are interconnected to form a continuous fluid flow path and have a uniform adherent corrosion resistant polymeric internal surface. The tubes further contain a longitudinal seam which is formed by crimping the edges of the tube together to provide for the compression of two polymer surfaces together thereby forming a seal capable of maintaining its integrity at conventional design pressures.

REFERENCES:
patent: 1954638 (1934-04-01), Loeffler
patent: 2476666 (1949-07-01), Keller
patent: 2845284 (1958-07-01), Kallstrom
patent: 4570700 (1986-02-01), Ohara et al.
patent: 4738307 (1988-04-01), Bentley
patent: 4807588 (1989-02-01), Bentley et al.
patent: 4848314 (1989-07-01), Bentley
patent: 4982785 (1991-01-01), Tomlinson

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