subject: Role Heat Exchanger in major Industries [print this page] Heat Exchanger is a device for an efficient heat transfer between two fluid media. The two medium may be in separate paths or be in direct contact. Heat Exchangers are mainly used in Generators, Compressors, Process Cooling like space heating, refrigeration, air conditioning, power plants, chemical plants, Marine, Automobile, Petrochemical Plants, Petroleum Refineries and Natural Gas Processing, Nuclear Plants, Ports, Ship Building Centre, Indian Railway etc. United Heat Exchangers is one of the very few companies in the work manufacturing all types of heat exchangers in one roof. The heat exchangers flow in two nature. One is co current flow [ Parallel Flow ], second one is counter current flow [ Counter Flow ]. This Heat Exchangers are mainly used for reducing or increasing the heat in one media to another media.
There are many type of heat such as Air Cooled Heat Exchanger, Shell Tube Heat Exchanger, Finned Tube Heat Exchanger, Plate Type Heat Exchanger, Air Cooled Condenser , Air Fin Cooler , Tube Bundle Heat Exchanger , Brazed Plate Heat Exchanger, Aluminium Heat Exchanger, Stainless Steel , Copper Heat Exchanger, Air Heat Exchanger, Compact Heat Exchanger , Double Pipe Heat Exchanger, Marine Heat Exchanger, Tubular Heat Exchanger, Water Heat Exchanger, Plate Heat Exchanger, Air Cooled Heat Exchanger
Shell and tube heat exchangers
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 260C).[2] This is because the shell and tube heat exchangers are robust due to their shape.
Adiabatic wheel heat exchanger
A third type of heat exchanger uses an intermediate fluid or solid store to hold heat, which is then moved to the other side of the heat exchanger to be released. Two examples of this are adiabatic wheels, which consist of a large wheel with fine threads rotating through the hot and cold fluids, and fluid heat exchangers.
Plate fin heat exchanger
This type of heat exchanger uses "sandwiched" passages containing fins to increase the effectivity of the unit. The designs include crossflow and counterflow coupled with various fin configurations such as straight fins, offset fins and wavy fins.
Plate and fin heat exchangers are usually made of aluminium alloys which provide higher heat transfer efficiency. The material enables the system to operate at a lower temperature and reduce the weight of the equipment. Plate and fin heat exchangers are mostly used for low temperature services such as natural gas, helium and oxygen liquefaction plants, air separation plants and transport industries such as motor and aircraft engines.
Fluid heat exchangers
This is a heat exchanger with a gas passing upwards through a shower of fluid (often water), and the fluid is then taken elsewhere before being cooled. This is commonly used for cooling gases whilst also removing certain impurities, thus solving two problems at once. It is widely used in espresso machines as an energy-saving method of cooling super-heated water to be used in the extraction of espresso.
