A Heat Exchanger is a device designed to transfer heat between two or more fluids without mixing them. It is commonly used in industries to heat, cool, or recover energy from process fluids efficiently. Examples include shell-and-tube, plate, air-cooled, and finned heat exchangers. https://www.heatexchanger.co.in/Heat-Exchanger-Blog-Details/role-of-heat-exchangers-in-industries/