HEAT EXCHANGER, HEAT EXCHANGE SYSTEM, METHOD OF CONSTRUCTING HEAT EXCHANGE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a heat exchanger of high efficiency and the like capable of being easily manufactured, and easily constructed in installation, without fear of causing misalignment of pitches of pipes of the heat exchanger.SOLUTION: A double pipe 3 is provided with an inner pipe 3a inside thereof, and an outer pipe 3b is integrally formed at its outside. An inner peripheral face of a trough section 13 of the outer pipe 3b is fused to an outer peripheral face of the inner pipe 3a. A space surrounded by an outer peripheral face of the inner pipe 3a and an inner peripheral face of a peak section 11 is applied as a flow channel in which a fluid flows. Both ends of the double pipe 3 are respectively provided with fluid pipe connecting sections 5a, 5b. The fluid flowing into the flow channel spirally flows in the flow channel between the inner pipe 3a and the outer pipe 3b of the double pipe 3, to the other end side. The fluid reaching the end section flows inside of the inner pipe 3a, and flows in the end direction at a fluid pipe connecting section 5a side. When the fluid reaches an axial end section of the double pipe 3, the fluid inside of the flow channel flows out to a fluid pipe 7b through a joint 9b.