Abstract: A corrugated rib structure for a heat exchanger may include wave-shaped wave crests and wave troughs running in a through-flow direction, and which may be connected with one another via wave-shaped walls running in the through-flow direction; and inwardly flared fins provided in at least one of: (i) the wave crests, and (ii) the wave troughs.

Abstract: A heat exchanger, in particular an exhaust gas cooler or charge air cooler, is provided that includes a plate stack which has a plurality of elongated plate pairs, each set of two interconnected plates forming a respective second fluid channel between themselves, and a first fluid channel being formed between two plate pairs, a first fluid channel being surrounded by two second fluid channels, each second fluid channel being connected to at least one manifold.

Abstract: A heat exchanger, in particular an exhaust gas cooler or charge air cooler, is provided that includes a plate stack which has a plurality of elongated plate pairs, each set of two interconnected plates forming a respective second fluid channel between themselves, and a first fluid channel being formed between two plate pairs, a first fluid channel being surrounded by two second fluid channels, each second fluid channel being connected to at least one manifold.

Abstract: The invention relates to a heat exchanger, particularly for a motor vehicle, comprising a plurality of exchanger tubes (3) attached to at least one floor for conveying a first fluid, wherein the exchanger tubes (3) are disposed in a housing through which a second fluid flows, wherein a holding member (5) is disposed inside the housing, wherein at least two of the exchanger tubes (3) are supported relative to one another by means of the holding member (5).

Abstract: A heat exchanger, particularly an exhaust gas heat exchanger, for transferring heat in two stages between a first fluid and second and third fluids that have different temperatures includes a block for separately conducting the first and second and third fluids in a heat transferring manner. The block encompasses a number of ducts through which the first fluid can flow, a first chamber of a high-temperature part through which the second fluid can flow and which accommodates the ducts, a second chamber of a low-temperature part through which the third fluid flows and which accommodates the ducts, and a housing in which the first and second chamber as well as the ducts are arranged. The first chamber and the second chamber are separated from one another by a separation area that is mounted in a groove.

Abstract: A flow channel for a heat exchanger for exchanging heat between a first fluid and a second fluid, the flow channel having, perpendicular to a flow channel axis, a cross-section that can be traversed, the flow channel providing for an improved transfer of heat with an acceptable drop of pressure and a reduced risk of blocking. The flow channel has a hydraulic diameter, defined as quadruple the ratio between the surface of the cross-section that is traversed and the perimeter that can be moistened by the fluid, of between 1.5 mm and 6 mm. Also a heat exchanger having a plurality of flow channels of this type, through which the first fluid flows and fluidically connected by a fluid connection. Also a charge-air system and an exhaust gas recycling system having such flow channels.

Abstract: The invention relates to a heat exchanger, particularly for a motor vehicle, comprising at least one duct (24-29) through which a fluid flows and of which at least some section have a curved shape. Preferably, said heat exchanger comprises several ducts through which a fluid flows and of which at least some sections have a curved shape. In order to increase the heat exchanging capacity, the duct (24-29) of which at least some sections have a curved shape is provided inside a profiled extruded element.

Abstract: A flow channel for a heat exchanger for exchanging heat between a first fluid and a second fluid. The flow channel comprises a channel cover provided with a space surrounded by an inner side of the channel cover; a plurality of partitions that are arranged on the inner side of the channel cover in the space. The flow channel having, perpendicular to a flow channel axis, a cross-section that can be traversed and embodied for guiding the first fluid in the inner chamber. Thereby an improved transfer of heat is ensured with a more acceptable drop of pressure and a reduced risk of blocking. As a result, a hydraulic diameter in the region of between 1.5 mm and 6 mm, defined as the quadruple of the ratio between the surface of the cross-section that is traversed and the perimeter that can be moistened by the fluid. The invention also relates to a heat exchanger comprising a block having a plurality of flow channels of said type, through which the first fluid flows and fluidically connected by a fluid connection.

Abstract: A heat exchanger, particularly an exhaust gas heat exchanger, for transferring heat in two stages between a first fluid and a second and third fluid that have different temperatures is provided. The heat exchanger comprises a block for separately conducting the first as well as the second and third fluid in a heat transferring manner. The block encompasses a number of ducts through which the first fluid can flow, a first chamber of a high-temperature part, through which the second fluid can flow and which accommodates the ducts, a second chamber of a low-temperature part, through which the third fluid flows and which accommodates the ducts, and a housing in which the first and second chamber as well as the ducts are arranged. Thus, a two-stage heat exchanger is provided at a low cost and keeps leakage between the high-temperature part and the low-temperature part low. Whereby the first chamber and the second chamber are separated from one another by means of a separation area that is mounted in a groove.

Abstract: A cooling system for a vehicle having an internal-combustion engine has a plurality of cooling circuits with heat exchangers for each circuit. The temperatures of different cooling media are measured and processed in a switching device to form an output signal which serves to control a fan. In this way, the air flow through the heat exchangers can be varied depending on measured temperature conditions. Individual capacity control of each cooling circuit is possible, thereby preventing unfavorable operating conditions in the individual circuits. The cooling capacity demand of the individual cooling circuits is determined by a central control unit which receives signals from temperature sensors in each circuit. The central control unit includes a microprocessor. Each cooling circuit has an actuating means for individually controlling the capacity of the relevant heat exchanger.