A Heat Exchanger is a device that allows heat to pass from one fluid to another without the fluids mixing. It is widely used in industrial processes, power plants, chemical plants, and HVAC systems to efficiently heat or cool fluids. Common types include shell-and-tube, plate, air-cooled, double-pipe, and coil heat exchangers. https://www.heatexchanger.co.in/Heat-Exchanger-Blog-Details/role-of-heat-exchangers-in-industries/