Patent ID: 8439103

Claim:
Heat exchanger, comprising: a plurality of walls of plastic material, the walls being held in spaced, generally parallel relation to form through-flow channels; heat-conducting metal fins arranged between adjacent walls, which fins have a width extending between the walls and a length defining a flow direction, the heat-conducting metal fins being generally parallel to one another and structurally connected to the respective adjacent walls to maintain said spaced parallel relation and wherein the fins on a first side of a wall are each aligned with and in direct thermal contact with a corresponding fin on a second side of that wall, whereby heat conduction can take place from fin to fin through the wall; wherein the fins within each through-flow channel are arranged in a plurality of strips, spaced and thermally separated from one another in said flow direction, the fins in each strip being spaced from each other by a pitch distance and the fins in a first strip being offset from the fins in an adjacent strip by a fraction of the pitch distance.