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Heat exchanger for a motor vehicle air conditioning system

a heat exchanger and motor vehicle technology, applied in the direction of lighting and heating apparatus, tubular elements, stationary conduit assemblies, etc., can solve the problems of time-consuming and expensive soldering of the ribs of the tubes to the tubes, insufficient heat transfer surface area, and insufficient heat transfer heat transfer for air conditioning systems

Inactive Publication Date: 2007-02-01
OBRIST ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is stated that without such ribs, in a similarly compact design as it is needed for use in motor vehicles, the heat transfer surface area obtainable would be insufficient to obtain the heat transfer needed for an air conditioning system.
The provision of ribs on the tubes including their soldering to the tubes is time-consuming and expensive and furthermore, the solder connections are often faulty as a result of incomplete soldering contact areas along the relatively long length of the solder joint.
A changeover of such a heat exchanger to a selective heating operation of the air conditioning system would result in a sudden vaporization of the moisture and its condensation at the windshield of the motor vehicle.
To avoid this, it would be necessary to provide a second parallel heat exchanger for heating the air which is space-consuming and expensive.

Method used

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  • Heat exchanger for a motor vehicle air conditioning system
  • Heat exchanger for a motor vehicle air conditioning system
  • Heat exchanger for a motor vehicle air conditioning system

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Embodiment Construction

[0037] The heat exchanger according to the invention is provided mainly for installation in the air flow of a CO2 vehicle air conditioning system where, during cooling operation, it is used as an evaporator. To this end, it is installed in an air supply housing which also includes a blower. Consequently, the heat exchanger must be compact with dimensions of for example 235 mm width and 250 mm height. In order to ensure a heat exchange capacity corresponding to the desired performance of the air conditioning system a relatively large air-side heat exchange surface must be provided since, at this side, the heat transfer is only about one fifth of that at the inside surfaces of the heat exchange tubes which are in heat exchange contact with the operating medium of the air conditioning system such as condensing CO2. In modified embodiments, other refrigerants may be provided such as water, NH3, R404A, R407C, R410A, R22, SF6, etc.

[0038] The heat exchanger tubes generally are extruded fl...

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Abstract

In an air / refrigerant heat exchanger, particularly for a motor vehicle air conditioning system, including a plurality of flat tubes arranged in closely spaced relationship so that a narrow flow passage for air is formed therebetween, the flat tubes include passages through which refrigerant is conducted in the longitudinal direction of the flat tubes and are provided on their outer surfaces with longitudinal parallel recesses and projections such that the flat tubes are wave-shaped the recesses and projections flattening out toward the narrow ends of the flat tubes and provide for narrow flat rectangular end sections.

Description

[0001] This is a Continuation-In-Part Application of International Application PCT / EP2005 / 002537 filed 10 Mar. 2005 and claiming the priority of German application 10 2004 011 608.3 filed 18 Mar. 2004.BACKGROUND OF THE INVENTION [0002] The invention relates to an air / refrigerant heat exchanger, particularly for a motor vehicle air conditioning system, with several flat tubes which extend parallel to one another and are exposed to an air flow while refrigerant is conducted through the tubes. Opposite wall areas of adjacent flat tubes form therebetween flow channels for the air and several flat tubes are connected at their ends to a refrigerant distributor which is provided with a tube connector for connection to a circuit system. [0003] Heat exchangers of this type are known in many configurations as shown for example in U.S. Pat. No. 5,941,303 and the relevant state of the art listed therein. This publication as well as DE 103 06 786 are concerned essentially with the configuration ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F9/02F28D1/053F28F1/02F28F3/04F28F9/013F28F13/12F28F13/18F28F27/02
CPCF28D1/0246F28D1/05391F28D2021/0073F28F1/022F28F3/04F28F2240/00F28F9/028F28F13/08F28F2245/02F28F2255/16F28F9/0132
Inventor OBRIST, FRANKTESSENDORF, NORBERTKUHN, PETERGRAZ, MARTIN
Owner OBRIST ENG
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