Heat exchange – Radiator core type – Side-by-side tubes traversing fin means
Patent
1990-01-10
1991-08-27
Ford, John
Heat exchange
Radiator core type
Side-by-side tubes traversing fin means
165181, 165182, 165903, 165906, F28F 132, F28D 104
Patent
active
050425765
ABSTRACT:
A finned tube heat exchanger having an improved flat louver fin configuration for increased heat transfer efficiency and low air pressure drop. The fins comprise generally planar sheet metal plates having a pattern of spaced apertures for receiving a group of heat exchanger tubes perpendicularly to the fin plate. Groups of louvers are formed as elongate strips extending generally in an area between adjacent tubes. The strips are selectively offset, i.e. raised or lowered from the nominal plane of the fin, so as to establish a louver pattern having flat louvers in a number of different planes each parallel to the direction of flow of air across the fin. Stiffness is provided for the fin plate by providing a slope and offset of the leading and trailing edges of the fin plate such that they are displaced in a direction parallel to the axes of the tube. Preferably the ends of the louvers are positioned and angled to be tangent to flow streamlines around the circumference of the tubes to present minimum obstruction to flow.
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Kuethe & Chow, Foundations of Aerodynamics=Bases of Aerodynamic Design 3rd Ed.; Wiley & Sons, pp. 87-89, 1976.
Li, Wen-Hsiung; Lam, Sau-Hai; Principles of Fluid Mechanics, Addison-Wesley; London, 1964, pp. 115-117.
Ford John
Heatcraft Inc.
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