HEAT EXCHANGER AND COOLING CYCLE DEVICE USING SAME

摘要

A heat exchanger according to the present invention, in which a cylindrical channel is formed by the inner-circumferential surface of the outside heat-exchanger tube and the outer-circumferential surface of the inside heat-exchanger tube, and heat is exchanged between a first heat transfer medium flowing through the channel and a second heat transfer medium on the outside of the outside heat-exchanger tube or on the inside of the inside heat-exchanger tube, wherein: the cylindrical channel is provided with an intermediate heat-exchanger tube in which convex and concave sections are formed in an alternating manner in the circumferential direction of the channel; at least some of the peaks of the convex sections or at least some of the troughs of the concave sections of the intermediate heat-exchanger tube contact the heat-exchanger tube that contacts the second heat transfer medium among the outside and inside heat-exchanger tubes; and a plurality of openings extending from the outer-circumferential surface of the intermediate heat-exchanger tube to the inner-circumferential surface thereof are formed in a region between the peaks and troughs of the intermediate heat-exchanger tube.