Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U/Cmin
U.Cmin
Cmin/U
U/A.Cmin

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Heat and Mass Transfer
According to Prevost theory of heat exchange

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
Heat transfer by radiation requires no medium

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