A Heat exchanger (100, 200, 300) comprises a plurality of heat transfer modules (10, 20, 30, 40) which are disposed side by side so as to define a multilayer body (102, 202, 302) of the heat exchanger (100, 200, 300), wherein each heat transfer module (10, 20, 30, 40) is provided with at least one heat transfer medium channel (14, 24, 34, 44) designed to allow a flow of a heat-carrying medium therethrough, wherein at least one portion of the multilayer body (102, 202, 302) of the heat exchanger (100, 200, 300) is provided with a curvature which is designed so as to allow the heat exchanger (100, 200, 300) to be used as a curved outer skin section of a craft, and wherein adjacent heat transfer modules (10, 20, 30) of said at least one portion of the multilayer body (102, 202, 302) are arranged with a tilt angle of their central axes (A); towards each other such that each heat transfer module (10, 20, 30, 40) is aligned towards the center of a local osculating circle defined by an outer surface (106, 206, 306) of the heat exchanger (100, 200, 300).