Heat exchanger

a technology of heat exchanger and refrigerant, which is applied in the direction of lighting and heating apparatus, tubular elements, and stationary conduit assemblies, etc., can solve the problems of excessive reduction of reduce the resistance to flow of refrigerant, and suppress the effect of heat exchange efficiency reduction
US20070227715A1Inactive Publication Date: 2007-10-04DENSO CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DENSO CORP
Publication Date
2007-10-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A heat exchanger has tubes defining refrigerant passages therein and fins disposed between the tubes. The tubes have tube main walls opposed to each other. The fins are joined to the tube main walls. The tube main walls have projections that project inside of the tubes and define recesses on outer sides of the tubes. Each of the tubes has an outer dimension, in a direction perpendicular to the tube main walls, in a range between equal to or greater than 0.8 mm and equal to or less than 1.9 mm.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on Japanese Patent Application No. 2006-103093 filed on Apr. 4, 2006, the disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION

[0002] The present invention relates to a heat exchanger, which is for example used as a refrigerant radiator for cooling a refrigerant flowing in tubes.BACKGROUND OF THE INVENTION

[0003] U.S. Pat. No. 6,595,273 B2 (JP-A-2004-3787) discloses a heat exchanger having flat tubes, as a refrigerant radiator. The flat tubes have recesses on flat walls (tube main walls) thereof for allowing air to flow, thereby to improve the efficiency of heat exchange. The recesses are defined by projections formed on the tube main walls.

[0004] The projections have serpentine side walls such that air flows in the recesses in a serpentine or meandering manner. Because the flow of air adjacent to outer surfaces of the tube main walls is disturbed, development of a temperature boundary layer a...

Claims

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