Behr Gmbh & Co.

Behr Gmbh Co. Kg

Behr Gmbh & Co. Stuttgart

Martin Kotsch

Christoph Walter

Karl-Heinz Staffa

Walter Demuth

Hagen Mittelstrass

Hans-Joachim Krauss

Harald Raiser

Michael Sickelmann

Michael Kranich

Hans Joachim Krauss

Volker Kirschner

Rainer Heilig

Wolfgang Geiger

Jochen Schumm

Hagan Mittelstrass

A heat exchanger includes a tube with a heat-exchange passage and an end piece. The heat-exchange passage directs the flow of a first medium and includes a first flow section and a second flow section arranged in parallel. The end piece has a tube plate that includes a base plate, a diverter plate, and a cover plate. An end of the tube connects to the base plate. The diverter plate has a cutout that forms a diverter passage. The cover plate lies adjacent to the diverter plate and covers the diverter passage in a fluid-tight manner. A second medium flows exterior to the heat-exchange passage.

Heat exchanger for a motor vehicle

The invention relates to a heat exchanger, particularly a radiator for a heating or air conditioning unit in motor vehicles, which cools a coolant. Said heat exchanger () is penetrated by air, comprises collector pipes (S, S, S, S) and several essentially horizontally disposed pipes (), and is divided into several partial blocks (T, T, T, T). The surfaces of the inventive partial blocks are selected according to the dimensions of structural space-related zones having different air temperatures inside the assembly space of the heat exchanger, the partial block which is first penetrated by the coolant being arranged within a structural space-related zone having a higher air temperature, preferably within the zone having the highest air temperature.

Heat exchanger

The invention relates to a heat exchanger comprising tubes () that can be flown through along a number of hydraulically parallel flow paths () that are comprised of sections.

Heat exchanger, particularly for a motor vehicle

Disclosed herein is a heat exchanger with tubes () and at least one end piece, which has a tube bottom that, in turn, has a bottom plate (), a baffle plate () and a covering plate ().

A device for exchanging heat is disclosed herein. This device may be used in motor vehicle air-conditioning installations which include at least one distribution or collection chamber for a fluid, at least one flow device which is provided with at least one first flow connection section on the end thereof, and at least one second flow connection section on the end thereof, the first flow connection section being connected to the second flow connection section by means of at least one pipe section. At least one of the flow connection sections may be twisted at least once, one flow connection section may be connected to the collection chamber, and the other flow connection section may be connected to the distribution chamber.

Device for heat exchange

The invention relates to a device for exchanging heat, particularly for use in motor vehicle air-conditioning systems, comprising at least one coolant, at least one coolant inlet (), and at least one coolant outlet (), which lead into at least one head pipe (), whereby the head pipe () is divided into at least one inlet section (') and into at least one outlet section (&#x2032;) by at least one separating element (). The device for exchanging heat comprises at least one flow-through element (), which has at least two flow paths situated at least partially parallel to one another, and at least one cross-distributor () via which the flow paths of the flow-through element () are fluid-connected so that the inlet section is fluid-connected to the outlet section of the head pipe ().

Device for exchanging heat

The invention relates to a method of refrigerant level monitoring in a refrigerant circuit of an air-conditioning or heat-pump system having a compressor and a refrigerant which may, depending on the operating point, be operated in the supercritical range. The method includes standstill level monitoring with the compressor switched off and/or in-operation level monitoring with the compressor switched on. In the case of in-operation level monitoring, the refrigerant overheat (dT&#xfc;) at the evaporator is registered and, in the event of excessive overheat, it is concluded that there is underfilling. At a standstill, the pressure and temperature of the refrigerant are registered, and it is concluded that there is an improper refrigerant filling level if the pressure (p) lies below a minimum pressure value (p) or the temperature (T) lies above a maximum saturation temperature value (T) with the pressure being outside a predefinable intended pressure range ([p,p]).

Method of monitoring refrigerant level

The invention relates to a method for forming at least one flat-tube insertion slot in a header tube. A sawcut is introduced into the header tube during a sawing step, and the slot is configured, during a subsequent punching step, by means of a slot punch, which punches into the region of the sawcut. A rimmed opening can be configured during the punching step by using a slot punch with a larger width and/or length relative to the sawcut. The sawcut is preferably introduced to a depth less that the wall thickness of the header tube. The respective web region(s) between chamber of a multi-chamber header tube can be compressed during the punching operation to a level lower than that of a header-tube wall region functioning as a flat-tube insertion stop, in order to form a chamber-connecting duct.

Method of forming flat-tube insertion slots in a header tube

The invention relates to a method of refrigerant level monitoring in a refrigerant circuit of an air-conditioning or heat-pump system having a compressor and a refrigerant which may, depending on the operating point, be operated in the supercritical range. The method includes standstill level monitoring with the compressor switched off and/or in-operation level monitoring with the compressor switched on. In the case of in-operation level monitoring, the refrigerant overheat (dT&uuml;) at the evaporator is registered and, in the event of excessive overheat, it is concluded that there is underfilling. At a standstill, the pressure and temperature of the refrigerant are registered, and it is concluded that there is an improper refrigerant filling level if the pressure (p ) lies below a minimum pressure value (p ) or the temperature (T ) lies above a maximum saturation temperature value (T ) with the pressure being outside a predefinable intended pressure range (&lsqb;p ,p &rsqb;).

The invention relates to a serpentine heat exchanger having a first serpentine tube block ( ) comprising one or more adjacent first serpentine tube sections with parallel through-flow and a second serpentine tube block ( ) disposed behind the first and comprising one or more adjacent second serpentine tube sections with parallel through-flow. According to the invention, at least one of the second serpentine tube sections is connected in series for flow purposes via a diversion section ( ) to a first serpentine tube section lying adjacent thereto.

Serpentine heat exchanger

A heat-exchanger tube block is disclosed having at least two header tubes ( ), which are C-shaped in cross section and each of which has a continuous longitudinal slot ( ). Flat tubes ( ) are inserted into the header-tube longitudinal slots. A cover-plate element ( ) is provided which has a plurality of C-shaped openings and is fitted over one end of the at least two header tubes, so that the header tubes respectively fit into one of the openings and are secured in a fluid-tight manner. The tube-block can be used, for example, in an evaporator of CO air-conditioning installations for a motor vehicle.

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Ludwigsburg, Germany

Martin Kotsch