DOUBLE-TUBE HEAT EXCHANGER AND REFRIGERATING CYCLE DEVICE

• Main Authors: KATO, YOHEI, YANACHI, SATORU
• Format: Patent
• Language: English; French; German
• Published: 09.09.2015
• Subjects: BLASTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; HEAT EXCHANGE IN GENERAL; HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEATING; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

A double pipe heat exchanger includes an inner pipe 2 inside which a first fluid passes, an outer pipe 1 that has a diameter larger than the diameter of the inner pipe 2 and that covers the inner pipe 2, and second fluid passes through a space between the outer pipe 1 and the inner pipe 2, and a heat transfer area enlargement pipe 3 that is provided in the space and that has a projection-depression shape in which a length in the pipe-circumferential direction of inner contact portions 6 to be contact areas with the outer wall of the inner pipe 2 is made to be larger than a length in the pipe-circumferential direction of outer contact portions 7 to be contact areas with the inner wall of the outer pipe 1, and in addition, fin portions between the outer contact portion 7 and the inner contact portion 6 that traverse the space in a pipe cross section come into contact with the outer wall of the inner pipe 2 and the inner wall of the outer pipe 1 in oblique directions.