Heat and Mass Transfer
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in

Boiler
Electric heater
Refrigerator condenser coils
Steam condenser

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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,

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

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