TWISTED TUBE-TYPE HEAT EXCHANGER AND METHOD FOR MANUFACTURING TWISTED TUBE-TYPE HEAT EXCHANGER

摘要

Provided are a twisted tube-type heat exchanger and a method for manufacturing a twisted tube-type heat exchanger, with which a large-diameter tube and a small-diameter tube can be bonded without the use of flux. The twisted tube-type heat exchanger comprises: a large-diameter tube having a spiral groove that is formed in a spiral shape in the axial direction on the surface of the tube; a small-diameter tube that has an outer diameter which is the same as or smaller than that of the spiral groove, and that is wound around the large-diameter tube along the spiral groove; and a metal layer that is formed on the surface of the small-diameter tube and that is made of a different material than the small-diameter tube and the large-diameter tube. The spiral groove of the large-diameter tube and the surface of the small-diameter tube that faces the spiral groove are bonded via the metal layer that is fused by heating within a furnace.