Heat and Mass Transfer
The use of heat exchangers is made in

Radiators in automobile
Condensers and boilers in steam plants
Condensers and evaporators in refrigeration and air conditioning units
All of these

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Heat and Mass Transfer
According to Prevost theory of heat exchange

Heat transfer by radiation requires no medium
It is impossible to transfer heat from low temperature source to t high temperature source
Heat transfer in most of the cases takes place by combination of conduction, convection and radiation
All bodies above absolute zero emit radiation

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