Paul M Krueger

US Patent:

48462675, Jul 11, 1989

Filed:

Mar 14, 1988

Appl. No.:

7/168035

Inventors:

Walter J. Shattes - Bloomfield NJ
Nikhiles Bandyopadhyay - Somerset NJ
Paul C. Krueger - Warren NJ

Assignee:

The BOC Group, Inc. - Murray Hill NJ

International Classification:

F28F 1300

US Classification:

165133

Abstract:

Aluminum alloys suitable for fabrication into plate and fin type heat exchangers are subjected to a chemical etching procedure in order to improve the heat transfer efficiency thereof. Applicants have found that a high temperature heat treatment of an aluminum alloy plate material to produce a precipitate, followed by exposure to an etching composition, results in a heat exchanger surface modified by the formation of pits. The heat exchangers so modified may be advantageously used in the reboiler/condensor section of air separation units.

US Patent:

47674970, Aug 30, 1988

Filed:

Apr 1, 1987

Appl. No.:

7/032671

Inventors:

Walter J. Shattes - Bloomfield NJ
Nikhiles Bandyopadhyay - Somerset NJ
Paul C. Krueger - Warren NJ

Assignee:

The BOC Group, Inc. - Montvale NJ

International Classification:

C23F 100
B44C 122

US Classification:

156665

Abstract:

Aluminum alloys suitable for fabrication into plate and fin type heat exchangers are subjected to a chemical etching procedure in order to improve the heat transfer efficiency thereof. Applicants have found that a high temperature heat treatment of an aluminum alloy plate material to produce a precipitate, followed by exposure to an etching composition, results in a heat exchanger surface modified by the formation of pits. The heat exchangers so modified may be advantageously used in the reboiler/condensor section of air separation units.