Abstract: The invention relates to an evaporator for exchanging heat between an airflow and a coolant, comprising an array consisting of a single row of flat tubes (1) stacked in alteration with wavy dividers (2). Said dividers keep the tubes a distance (d) away from each other, their waves defining the channels for the airflow in the direction of the breadth of the tubes. Each tube has a U-shape, with the ends of each of the two limbs communicating with two chambers of a single fluid container respectively, in such a way as to define a path for the coolant in an even number of segments in the evaporator. According to the invention, the dimension (l) of the evaporator in said direction is between 20 and 48 mm and the distance (d) is between 4.0 and 7.6 mm.

Abstract: The invention concerns an evaporation unit for a heat exchanger between an air flow and a refrigerating fluid, comprising an array consisting of a single row of flat tubes (1) alternately stacked with corrugated spacers (2) retaining the tubes mutually spaced apart by a distance d and whereof the undulations define passages for the air flow in the direction of the tube width, the two ends of each tube respectively communicating with the two fluid boxes located opposite each other relative to the array, so as to define for the refrigerating fluid, in the evaporator, a path for at least two passages. The invention is characterized in that the dimension l of the evaporator in said direction ranges between 20 and 55 mm and the distance d ranges between 4.0 and 7.6 mm.