Abstract: A heat exchanger may include a heat exchanger block including a plurality of flat tubes held at a longitudinal end side in a respective rim hole of an associated tube plate. The respective rim hole may have at least two mutually opposite and substantially straight long sides and at least two mutually opposite narrow sides. A brazed connection may be disposed between at least one of the at least two long sides of at least one of the respective rim holes and a corresponding one of the flat tubes arranged therein, and the brazed connection may have an undulating brazing boundary. At least one of the plurality of flat tubes may include at least one partition. The undulating brazing boundary may have a high point that defines an increased thickness in relation to a plane running through two opposite groove bases disposed in the tube plate.

Abstract: A heat exchanger may include a heat exchanger block including a plurality of flat tubes held at a longitudinal end side in a respective rim hole of an associated tube plate. The respective rim hole may have at least two mutually opposite and substantially straight long sides and at least two mutually opposite narrow sides. A brazed connection may be disposed between at least one of the at least two long sides of at least one of the respective rim holes and a corresponding one of the flat tubes arranged therein, and the brazed connection may have an undulating brazing boundary. At least one of the plurality of flat tubes may include at least one partition. The undulating brazing boundary may have a high point that defines an increased thickness in relation to a plane running through two opposite groove bases disposed in the tube plate.

Abstract: 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.

Abstract: The invention relates to a heat exchanger comprising tubes (2, 3) that can be flown through along a number of hydraulically parallel flow paths (2c, 2d) that are comprised of sections.

Abstract: 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 (1) is penetrated by air, comprises collector pipes (S1, S2, S2, S4) and several essentially horizontally disposed pipes (5), and is divided into several partial blocks (T1, T2, T3, T4). 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.

Abstract: Disclosed herein is a heat exchanger with tubes (1) and at least one end piece, which has a tube bottom that, in turn, has a bottom plate (8), a baffle plate (12) and a covering plate (16).

Abstract: Disclosed herein is a heat exchanger with tubes (1) and at least one end piece, which has a tube bottom that, in turn, has a bottom plate (8), a baffle plate (12) and a covering plate (16).

Abstract: 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.

Abstract: 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 (3), and at least one coolant outlet (4), which lead into at least one head pipe (7, 8, 9), whereby the head pipe (7, 8, 9) is divided into at least one inlet section (41?) and into at least one outlet section (42?) by at least one separating element (49). The device for exchanging heat comprises at least one flow-through element (19), which has at least two flow paths situated at least partially parallel to one another, and at least one cross-distributor (10?, 10?, 11?, 11?, 12) via which the flow paths of the flow-through element (19) are fluid-connected so that the inlet section is fluid-connected to the outlet section of the head pipe (7, 8, 9).

Abstract: The invention relates to a heat exchanger (1), in particular for a motor vehicle, comprising a heat exchange assembly with a primary side, through which a first medium flows and a secondary side, through which a second medium flows and a housing sleeve with an inlet and an outlet for a second medium.

Abstract: 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 (dTü) 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 (pKM) lies below a minimum pressure value (pmin) or the temperature (TKM) lies above a maximum saturation temperature value (TS) with the pressure being outside a predefinable intended pressure range ([pu,po]).

Abstract: The invention related to a flat tube (1) comprising a return bend section (3), inside of which the flat tube (1) is bent back in such a manner that both planar tube sections (2a, 2b) thereof, which are connect to the return bend section, extend in a longitudinal direction with opposite flow-through directions (4a, 4b) and with longitudinal axes (5a, 5b) that are offset with regard to one another at least in the transverse direction (y). The invention provides that the return bend section (3) is formed in such a manner that a main bending axis (A) extends parallel to the flat tube to be plane and at a predeterminable angle to the tube longitudinal extension, whereby the flat tube plane is determined by the longitudinal and width extension of the flat tube (1).

Abstract: The invention relates to a heat exchanger used, in particular for motor vehicle air-conditioning systems with a liquid coolant. In a preferred variant, the used coolant is embodied in the form of carbon dioxide. The inventive heat exchanger comprises at least one supply duct, an exhaust line, two heat-exchanging units which are provided with at least one distribution space and one accumulating space and at least one circulating system. Each heat-exchanging unit is provided with at least one dividing system for dividing at least one distribution space or one accumulating space into two partial spaces. Said heat exchanger also comprises a flow actuating system connecting the heat-exchanging units to each other. The flow cross sections or the totality thereof arranged before and after said flow actuating device have a predetermined ratio therebetween.

Abstract: The invention relates to a device for exchanging heat, especially for using in motor vehicle air-conditioning installations comprising 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. According to the invention, at least one of the flow connection sections is twisted at least once, one flow connection section is connected to the collection chamber, and the other flow connection section is connected to the distribution chamber.

Abstract: The invention relates to a heat carrier comprising at least one collector pipe (1) for receiving the ends of flat pipes (10a), especially for a CO2 air conditioning unit for motor vehicles. The collector pipe (1) is formed by an open hollow profiled section (7) with edges (8, 9) forming a continuous longitudinal slit extending in a longitudinal direction and the ends of the flat pipes (10a), which are twisted at an angle of 90°, are received in a fluidically tight manner in the longitudinal slot. According to the invention, the edges (8,9) partially abut, forming a separating joint (4) and are partially rolled back, forming receiving openings for the ends of the flat pipes (10a). The receiving openings are produced by plastic deformation.

Abstract: The invention relates to a heat exchange comprising tubes (2,3) that can be flown through along a number of hydraulically parallel flow paths (2c, 2d) that are comprised of sections.

Abstract: The invention relates to a heat exchanger comprising tubes (1) and at least one end piece, which has a tube bottom that, in turn, has a bottom plate (8), a baffle plate (12) and a covering plate (16).

Abstract: 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 (1) is penetrated by air, comprises collector pipes (S1, S2, S2, S4) and several essentially horizontally disposed pipes (5), and is divided into several partial blocks (T1, T2, T3, T4). 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.

Abstract: 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 collant inlet (3), and at least one coolant outlet (4), which lead into one head pipe (7, 8, 9), whereby the head pipe (7, 8, 9) is divided into at least one inlet section (41?) and into at least one outlet section (42?) by at least one separating element (40). The device for exchanging heat comprises at least one flow-through element (19), which has at least two flow paths situated at least partially parallel to one another, and at least one cross-distrubitor (10?, 10?, 11?, 11?, 12) via which the flow paths of the flow-through element (19) are fluid-connected so that the inlet section is fluid-connected to the outlet section of the head pipe (7, 8, 9).

Abstract: 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 (dTü) 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 (pKM) lies below a minimum pressure value (pmin) or the temperature (TKM) lies above a maximum saturation temperature value (Ts) with the pressure being outside a predefinable intended pressure range ([pu,po]).