A heat exchanger is a device in which energy is transferred from one fluid to another across a solid surface. Exchanger analysis and design therefore involve both convection and conduction. Radioactive transfer between the exchanger and the environment can usually be neglected unless the exchanger is uninsulated and its external surfaces are very hot.SS-316, 304 and 302 stainless steel (Non-corrugated) heat-exchanger to suit the environment to which the material will be subjected in its lifetime.