Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Inferior insulation should be put over pipe and better one over it
Better insulation should be put over pipe and better one over it
Both may be put in any order
Whether to put inferior OIL over pipe or the better one would depend on steam temperature

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

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Heat and Mass Transfer
According to Prevost theory of heat exchange

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

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