A heat exchanger is a device built for efficient heat transfer from one medium to another, whether the media are separated by a solid wall so that they never mix, or the media are in direct contact.[1] They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, and natural gas processing. One common example of a heat exchanger is the radiator in a car, in which the heat source, being a hot engine-cooling fluid, water, transfers heat to air flowing through the radiator
Shell and tube heat exchanger
A Shell and tube heat exchangers consist of a series of tubes. One set of these tubes contains the fluid that must be either heated or cooled. The second fluid runs over the tubes that are being heated or cooled so that it can either provide the heat or absorb the heat required. A set of tubes is called the tube bundle and can be made up of several types of tubes: plain, longitudinally finned, etc. Shell and Tube heat exchangers are typically used for high pressure applications (with pressures greater than 30 bar and temperatures greater than 260°C. [2] This is because the shell and tube heat exchangers are robust due to their shape. There are several thermal design features that are to be taken into account when designing the tubes in the shell and tube heat exchangers. These include:
Tube diameter: Using a small tube diameter makes the heat exchanger both economical and compact. However, it is more likely for the heat exchanger to foul up faster and the small size makes mechanical cleaning of the fouling difficult. To prevail over the fouling and cleaning problems, larger tube diameters can be used. Thus to determine the tube diameter, the available space, cost and the fouling nature of the fluids must be considered.
Tube thickness: The thickness of the wall of the tubes is usually determined to ensure: There is enough room for corrosion that flow-induced vibration has resistance axial strength Ability to easily stock spare parts cost sometimes the wall thickness is determined by the maximum pressure differential across the wall.
Fined Tube Heat Exchangers are Thermally & Mechanically Designed on Indige-nously Developed Software based on the latest Technical Researches to achieve the most economical and efficient sizes.
Application
Finned tubes Heat Exchangers are used for various applications in Industry. Few of the ap-plications are :- |
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- Air & Gas Heating through Steam & Thermic Fluid.
- Air & Gas Cooling with Chilled Water / Refrigerant
- Oil Cooling using Air
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Paper & Packaging Industry : For drying coated paper in ultra modern and high capacity paper machinery.
Printing Industry : For driving the Inks, Solvents and to preheat the media used in the latest Rotogravure and Offset Printing machines.
Milk & food Industry : Extensively used for spray drying of Milk and other food suspensions like Starch, Gluten etc. Also used in Dehydrated Food industry for drying the vegetables etc.
Oil Extraction Industry : Used for seed drying prior to extraction.
Pollution Control : Used extensively to bring down the temperature of polluting gases and exhaust fumes prior to their treatment, resulting in smaller sized Pollution control equipment.
Process & Petrochemical Industry : Used in Furnace Chambers, for Gas Heating/Cooling and for dissipation of excess heat to air or to other media for energy conservation.
General Industry : Like Textiles, Steel, Cement, Shipping etc. for Heat Recovery Systems, Air based cooling systems and various other applications. |
