Patent ID: 8627882

Claim:
A heat exchanger or an exhaust gas heat exchanger for two-stage heat exchange between a first fluid, a second fluid, and a third fluid having a different temperature, the heat exchanger comprising: a block configured for a separated and heat-exchanging conveying of the first fluid, the second fluid, and the third fluid; a plurality of flow channels configured to allow the first fluid to flow therethrough; a first chamber of a high-temperature part configured to accommodate the flow channels and configured to allow the second fluid to flow therethrough; a second chamber of a low-temperature part configured to accommodate the flow channels and configured to allow the third fluid to flow therethrough; and a housing, in which the first chamber, the second chamber and the flow channels are arranged; wherein the first chamber and the second chamber are separated from one another by a separation area or a separating base that is mounted in a groove; wherein the first chamber and the second chamber, lying one behind the other cross-sectionally, are arranged in the housing and each have flow channels arranged one behind the other; wherein first fluid can flow sequentially and parallel in the same direction through the flow channels of the first and the second chamber; wherein the flow channels of the first chamber and the second chamber are substantially identical; and wherein the housing is made of two parts, wherein the housing parts are configured to be substantially identical and to directly abut each other, and wherein the groove is formed by both housing parts and faces inwardly relative to the housing.