Evaporator with improved heat-exchanger capacity

A heat-exchanger for the exchange of heat between a first and a second fluid, comprising a stack of pockets which are mutually aligned in a longitudinal direction, and which form two collector casings which are mutually juxtaposed in a lateral direction, the pockets each being formed, through their alignment, in the longitudinal direction, by input and output chambers which are respectively part of different pockets, the collector casings collectively being sub-divided into at least three connection conduits, the conduits belonging to the same collector casing being disposed one after the other in the longitudinal direction and not connected directly with each other, in each connection conduit the input or output chambers are mutually connected via openings in the walls of the pockets, the pockets defining a course for the first fluid between an upstream connection conduit adjacent to a first longitudinal end of the stack and a downstream connection conduit adjacent to the second longitudinal end of the stack, passing alternately via U-shaped courses, each of which connect the input and output chambers of one same pocket from a connection conduit which is part of one of the collector casings to a connection conduit which is part of the other collector casing, the upstream and downstream connection conduits being connected to an input and an output passage provided in one of the longitudinal ends, one directly and the other via tubing across the openings of the connection conduit which are located between this same end and the other connection conduit, wherein the tubing is eccentrically located in relation to the openings on the downstream side of the second fluid.