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The Heat Exchanger is a device built for effective transferring of heat power from one fluid to an additional across a strong surface. In a heat exchanger design both the convection and conduction principle of heat transfer is used. There is no radiative transfer of heat power among the exchanger and the atmosphere unless the exchanger is uninsulated or its external surfaces are very hot. The heat exchanger has wide use in engineering processes. The most frequent example of a heat exchanger is the radiator in a auto. Here the hot fluid in the radiator is cooled by the air flow more than the radiator surface.

Some other examples of heat exchanger are preheaters, intercoolers, boilers, condensers, and so forth. that are used in the power plants. They are also utilized in refrigeration, air conditioning, chemical processing and power production.

Distinct sorts of Heat Exchangers:

There are diverse types of heat exchangers. They can be classified according to its construction into the following types i.e. shell and tube heat exchanger and plate and frame heat exchanger.

- Shell and tube heat exchanger: This is a standard heat exchanger. The shell and tube heat exchanger is consisting of a series of finned tubes through which one particular of the fluids runs and the other fluid which is to be heated or cooled runs more than the finned tubes.

- Plate and frame heat exchanger: In a plate and frame heat exchanger, the fluids are separated by plates with a big surface area. Right here the flow is directed by means of the baffles.

The heat exchangers classified according to its utilizes are recuperative type, regenerative sort and evaporative kind.
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- Recuperative variety: In recuperative kind heat exchanger the heat from the fluids on either side of a dividing wall is exchanged.

- Regenerative sort: In regenerative variety heat exchanger the hot and cold fluids are permitted to occupy the identical space containing a matrix of material that works alternatively as a sink or source for heat flow.

- Evaporative kind: In evaporative kind heat exchanger the fluid is evaporatively cooled in the identical space as coolant such as a cooling tower.

- The recuperative type of heat exchanger again can be created according to one particular of the following kinds i.e. Parallel-flow, Counter-flow and Cross-flow.

- Parallel-flow heat exchanger: In this type of heat exchanger each the fluids exchanges heat by flowing in the identical course by means of individual pipes.

- Counter-flow heat exchanger: In this sort of heat exchanger the fluids exchanges heat by flowing in the opposite direction by means of person pipes.