Tube and fin assembly for heat exchangers in power plants

Power plants – Motor having exhaust fluid treating or handling means – Motor and indirect heat exchanger

Patent

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Details

165133, 165181, 165905, F28F 1318

Patent

active

049495437

ABSTRACT:
Potential difficulties with corrosion resistance in air cooled condensers 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), a 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: 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.
Operating Experience and Performance Testing of the World's Largest Air-Cooled Condenser (Apr./1981).
Air Cooled Condensers for Combined-Cycle and Cogeneration (no date).
GEA Air Cooled condensing Systems (no date).
GEA--Air Cooled Condenser for a 160 MW Steam Power Station etc. (6/1988).
GEA--Fin Tubes for Long Service Life (no date).

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