The Heat Exchanger is a device built for efficient transferring of heat energy from one fluid to another across a solid surface. In a heat exchanger design both the convection and conduction principle of heat transfer is used. There is no radiative transfer of heat energy between the exchanger and the environment unless the exchanger is uninsulated or its external surfaces are very hot. The heat exchanger has wide use in engineering processes. The most common example of a heat exchanger is the radiator in a car. Here the hot fluid in the radiator is cooled by the air flow over the radiator surface. Some other examples of heat exchanger are preheaters, intercoolers, boilers, condensers, etc. that are used in the power plants. They are also used in refrigeration, air conditioning, chemical processing and power production.

The heat exchangers classified according to its uses are recuperative type, regenerative type and evaporative type.
– Recuperative type: In recuperative type heat exchanger the heat from the fluids on either side of a dividing wall is exchanged.
– Regenerative type: In regenerative type heat exchanger the hot and cold fluids are allowed to occupy the same space containing a matrix of material that works alternatively as a sink or source for heat flow.
– Evaporative type: In evaporative type heat exchanger the fluid is evaporatively cooled in the same space as coolant such as a cooling tower.
– The recuperative type of heat exchanger again can be designed according to one of the following types i.e. Parallel-flow, Counter-flow and Cross-flow.
– Parallel-flow heat exchanger: In this type of heat exchanger both the fluids exchanges heat by flowing in the same direction through individual pipes.

As an electrician dealing with hot water cylinders for several years, the author has formed his unique opinions about solar panel. And he’s willing to help anyone.

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