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. The hot fluid flows through the inner pipe while the cold fluid flows through the outer pipe. It is simple, compact, and ideal for small-scale or high-temperature industrial applications. https://www.heatexchanger.co.in/Heat-Exchanger/Double-Pipe-Heat-Exchanger/