A Double Pipe Heat Exchanger consists of one pipe placed inside another, allowing two fluids to flow in either parallel (co-current) or opposite (counter-current) directions. Heat is exchanged through the inner pipe wall between the hot and cold fluids. This simple and durable design is ideal for small-scale or high-pressure applications. https://www.heatexchanger.co.in/Heat-Exchanger/Double-Pipe-Heat-Exchanger/