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Copper Alloy for Heat Exchanger Tube

a heat exchanger tube and copper alloy technology, applied in the field of copper alloys, can solve the problems of increasing the weight of the tube and therefore the material cost associated with the tube, and achieve the effects of good thermal conductivity, high tensile strength, and excellent processability

Inactive Publication Date: 2011-01-13
VIRTUS PRECISION TUBE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention provides a copper alloy, for use in heat exchanger tubes, having, for example, high tensile strength, excellent processability and good thermal conductivity.

Problems solved by technology

However, HCFC has a large ozone depleting potential such that other cooling media have been selected for environmental reasons.
Due to the increased pressure and to some loss of strength due to brazing in some tube forming processes, conventional copper materials have to be made thicker thereby increasing the weight of the tube and therefore the material costs associated with the tube.

Method used

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  • Copper Alloy for Heat Exchanger Tube
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[0039]Copper alloys with different Ni and Sn contents were produced in pilot scale and mechanical and physical properties tested, see Table 1.

[0040]The results was plotted versus the amount of Ni or Sn, see FIG. 2. All tested alloys meet a desired minimum conductivity of 35% IACS. The mechanical properties of a minimum tensile strength of 38 ksi is achieved for all tested alloys. In order to meet desired strength and conductivity the composition should be from 0.2% to 1.0% by weight for both Ni and Sn.

[0041]Material of a composition of 0.5% Ni and 0.5% Sn (CuNi(0.5)Sn(0.5) was produced in full production scale and formed to tubes using the roll and weld method. The tubes were produced both in standard wall thickness (e.g., 0.0118 inches) and with 13% lower wall thickness. Mechanical properties of the tubes were tested using ASTM and UL (e.g., UL testing protocols and compared with tubes made of “present use” copper alloy C12200 with standard wall thickness. The results are shown in ...

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Abstract

An alloy comprising copper, nickel, tin and, optionally, phosphorus which can be used in, for example, a copper alloy tube for heat exchangers that provides excellent fracture strength and processability for reducing the weight of the tube and for use in high pressure applications with cooling media such as carbon dioxide.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. provisional patent application No. 61 / 224,671, filed on Jul. 10, 2009, the disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention pertains generally to copper alloys and use of the copper alloys in tubes for heat exchangers. Specifically, the invention pertains to a high strength copper alloy tube that has desirable pressure fracture strength and processability properties. The alloy is suitable to reduce thickness, and therefore, conserves material, for existing air conditioning and refrigeration (ACR) heat exchangers, and is suitable for use in a heat exchanger using a cooling medium such as CO2.BACKGROUND OF THE INVENTION[0003]Heat exchangers for air conditioners may be constructed of a U-shaped copper tube bent like a hairpin and fins made from aluminum or aluminum alloy plate.[0004]Accordingly, a copper tube used for the above type heat exchang...

Claims

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Application Information

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IPC IPC(8): F28F21/08C22C9/02C22C9/06F28F1/00
CPCC22C9/02C22F1/08F28F21/085C22C9/06
Inventor FINNEY, M. PARKERIGNBERG, LARZKAMF, ANDERSGOEBEL, TIMOTHY L.GONG, YINGROTTMANN, EDWARD G.
Owner VIRTUS PRECISION TUBE LLC
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