HEAT EXCHANGE PIPE

摘要

PURPOSE: A heat exchanging tube is provided to enhance the heat exchange efficiency of high-temperature exhaust gas and a heat exchange tube by increasing the contact area of the heat exchange tube with the exhaust gas. CONSTITUTION: A heat exchange tube collects the heat from the exhaust gas of a high temperature. The heat exchange tube comprises a plurality of spiral projections(121) and a gas path(122). The spiral projection is spirally wound along the outer circumference of the heat exchange tube in the longitudinal direction of the heat exchange tube and is formed to be projected from the outer circumference. The spiral projections are arranged to be spaced each other on the outer circumference. The gas path is formed by neighboring spiral projections and the outer circumference between the neighboring spiral projections. The contact area of the heat exchange tube and the exhaust gas increases as the exhaust gas passes along the spiral gas path formed n the outer circumference.