Heat exchangers are the most used members of chemical processes and can be seen in most industrial units. They transfer heat energy between two or more fluids at different temperatures. This operation can be done between liquid-liquid, gas-gas, or gas-liquid. Heat exchangers are used to cool a hot fluid heat a fluid with a lower temperature or both.Heat exchangers are used in a wide range of applications. These applications include power plants, refineries, petrochemicals, manufacturing, process, food and pharmaceutical industries, metal smelting industries, heating, air conditioning, refrigeration systems and space applications. Heat exchangers in various devices such as boilers, steam generators, condensers, evaporators, evaporators, cooling towers, fan coil preheaters, oil coolers and heaters, radiators, furnaces, etc., are widely used.