A Double Pipe Heat Exchanger consists of one pipe placed inside another, allowing two fluids to flow in counterflow or parallel flow for heat transfer. It is simple in design, easy to construct, and ideal for small-scale or low-flow applications. This type of exchanger is widely used in chemical, oil, and process industries for efficient heating or cooling of fluids. https://www.heatexchanger.co.in/Heat-Exchanger/Double-Pipe-Heat-Exchanger/