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/A.Cmin
U/Cmin
Cmin/U

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Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

The better insulation must be put outside
The better insulation must be put inside
One should take into account the steam temperature before deciding as to which insulation is put where
One could place either insulation on either side

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