A double pipe heat exchanger is a fundamental type of heat exchanger commonly used in industries that require efficient thermal energy transfer between two fluids. Structurally, it consists of one pipe nested concentrically inside another—hence the name "double pipe." One fluid flows through the inner pipe, while another flows through the annular space between the inner and outer pipe... https://www.heatexchanger.co.in/Heat-Exchanger/Double-Pipe-Heat-Exchanger/