Patent ID: 7147047

Claim:
A heat exchanger comprising: a plurality of flat tubes through which a first fluid can flow and which can be externally exposed to a second fluid and which are arranged fundamentally parallel to one another and transversely to the direction of flow of the second fluid, wherein the flat tubes are spaced apart forming a plurality of flow paths for the second fluid passing through the heat exchanger; a plurality of corrugated fins arranged in each flow path for the second fluid extending between two adjacent flat tubes; wherein the plurality of corrugated fins in each flow path for the second fluid is arranged in series in the direction of the flow of the second fluid and laterally offset in relation to one another in their respective flow path; wherein at least one of the corrugated fins in each flow path for the second fluid has gills for directing the second fluid; and wherein the fins are arranged laterally offset in a direction of the flow of the first fluid.