Evaporator core having biocidal fixture

Details Evaporator core having biocidal fixture Evaporator core having biocidal fixture

1990-08-27

1991-08-27

Flanigan, Allen J.

Heat exchange

With protector or protective agent

165133, F28F 1900

Patent

active

050425757

ABSTRACT:
In a preferred embodiment of the invention, an evaporator core for an automotive air conditioning system or the like comprises a brazed plate-and-fin heat exchanger formed of aluminum alloy and having air passages opening at an upstream face. The evaporator core further comprises a biocidal fixture attached to the heat exchanger upstream face. The fixture comprises a carrier formed of an electrically nonconductive polymer and metallic copper plate deposited on the surface of the carrier spaced apart from the heat exchanger. During air conditioning operations, condensate collecting on the cooper surfaces reacts with the copper to generate cupric ions that disperse in the condensate to inhibit biological growth within the heat exchanger passages. Moreover, the carrier electrically, as well as physically, isolated the copper from the aluminum to prevent galvanic coupling that would otherwise produce accelerated corrosion of the heat exchanger.

REFERENCES:
patent: 4355636 (1982-10-01), Oetjen et al.
patent: 4395313 (1983-07-01), Lindsay et al.
patent: 4830101 (1989-05-01), Ohara et al.
U.S. Serial No. 360,681 filed by Siak et al., on Jun. 2, 1989.
Lindsay et al. "Vacuum Preplate Process for Plating on Acrylonitrile-Butadiene-Styrene (ABS)", Plating and Surface Finishing, Jul. 1985, pp. 54-59.
Lowemheim, Electroplating, McGraw-Hill, New York, NY (1978), pp. 404-408.
Uhlig, Corrosion Handbook, Wiley & Sons, New York, NY (1948), pp. 53, 67-68.
Wernick et al., The Surface Treatment and Finishing of Aluminum and Its Alloy, vol. 1, ASM International, Metals Park, OH (1987), pp. 8.gtoreq.23.

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