Different Types Of Heat Exchangers

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Heat exchangers are devices that provide the flow of thermal energy between two fluids at the different temperatures. [1]
Transfer of thermal energy between two fluids at difference temperature that devices is known as heat exchanger. One can realize their usage that any process which involves cooling, heating, condensation, boiling or evaporation will require a heat exchanger for these purposes .Heat energy is transferred from one body or fluid stream to another.
Different heat exchangers are named according to their applications. For example heat exchanger being used to condense are known as condensers, similarly heat exchanger for boiling purposes are called boilers. In the design of heat exchanger equipment, heat transfer equations are
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In heat exchangers the temperature of each fluid changes and the exchange of energy takes places as fluid passes through the exchangers.

Shell & tube heat exchanger are the most Multilateral type of heat exchangers. They are used in the process industries, in conventional & nuclear power plants, and feed water heaters, and they are proposed for many alternative energy applications including ocean, thermal & geothermal. It is also used in some air conditioning and refrigeration systems

Shell & tube heat exchanger provide relatively large ratios of heat transfer area to volume & weight and they can be easily cleaned. They offer great flexibility to meet almost any service requirement. Reliable design methods and shop facilities are available for their successful design and construction. Shell & tube heat exchangers can be design for high pressure relative to the environment and high pressure difference between the fluid streams

The problem in the heat exchanger is right type of material that enables higher heat transfer and thus reduce size of the heat exchanger.
• As we know that the material with higher thermal flux rate can dramatically increase the volumetric efficiency of the heat
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This kind of Fouling is occurs into the water tubes boilers in which the unburnt fuel or ashes are carried over by the combustion gases that is sucked on the outer surface of the tubes and heavy partials are settle down due to the gravitational forces.

Fouling in which the heat exchangers becomes fouled through the process of crystallization. In the tube side the salt water are used as a cold fluid that time the cooling water system are often prone to crystal deposition because of availability of the such as calcium, magnesium carbonate, phosphates and silicates. This materials are damage the inside surface of the tube & decrease the efficiency of the heat exchanger

The heat transfer exposed to a corrosive fluid may react, producing corrosion product. Due to the corrosion the fouling will be occur. That the pH value of fluid does not dissolve the corrosion product as they formed. In the impurities of alkali metals, sulphur and vanadium can cause corrosion in oil fires

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