Heat exchangers are mechanisms designed to transfer heat from one fluid to another, usually of lower temperature. Although this transfer is made through a metal plate or a tube, they do not allow the two fluids to mix.
There are two types of heat exchangers:
Direct contact: The heat transfer is performed by means of a physical mixing of the two fluids. Both are separated in another process, after the energy exchange. A good example of this are cooling towers.
Indirect contact: These mechanisms allow heat exchange without allowing the fluids to mix. They are separated with solid materials and the heat is transferred by conduction.
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