Heat exchange – With coated – roughened or polished surface
Patent
1990-07-26
1991-08-27
Flanigan, Allen J.
Heat exchange
With coated, roughened or polished surface
228183, F28F 1906
Patent
active
050425749
ABSTRACT:
Potential difficulties with corrosion in heat exchangers utilizing aluminum fins are avoided by using fin and tube constructions made by a method which includes the steps of providing a flattened tube (50) of ferrous material (80) and having an exterior coating (82) predominantly of aluminum; providing at least one serpentine fin (56) of aluminum (86) and clad with a predominantly aluminum braze cladding (88); assembling (102) the fin (56) to the flattened tube (50); applying (94), (100), (104), brazing flux to at least one of the fin (56) and the tube (50); raising (106) the temperature of the assembly to a level sufficient to at least partially melt the braze cladding (88); and maintaining the temperature for a sufficient period of time to achieve a brazed joint (60) between the fin (56) and the tube (50) but a time insufficient to convert the coating (82) and the cladding (88) to ferrous-aluminum intermetallic compound or intermediate phase.
REFERENCES:
patent: 3960208 (1976-06-01), Anthony et al.
patent: 4032059 (1977-06-01), Plegat
patent: 4075376 (1978-02-01), Jaeger
patent: 4168742 (1979-09-01), Kluppel et al.
patent: 4256177 (1981-03-01), Saperstein
patent: 4830101 (1989-05-01), Ohara et al.
patent: 4949543 (1990-08-01), Cottone et al.
Air Cooled Condensers for Combined-Cycle and Cogeneration, Jun. 1988--two pages.
Operating Experience and Performance Testing of the World's Largest Air-Cooled Condenser--by Kosten et al., Apr. 27-29, 1981.
GEA Air Cooled Condensing Systems, GEA-Information--Air cooled condenser for a 160 MW Steam etc., GEA-Information--Fin Tubes for long service life.
Cottone Andrew J.
Saperstein Zalman P.
Flanigan Allen J.
Modine Manufacturing Company
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