Steam at 320oC flows in a stainless steel pipe k = 15 W/mK, whose inner and outer diameters are 5cm and 5.5cm respectively.  The pipe is covered with 3cm thick glass wool insulation (k = 0.038 W/mk).  Heat is lost to the surroundings of 5oC by natural convection and radiation heat transfer of a total coefficient 15 W/m2K.  Taking the heat transfer coefficient inside the pipe to be 80 W/m2K, determine the rate of heat loss from the steam per unit length of the pipe.  Also determine the temperature drops across the pipe shell and insulation.

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.