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Radiation-:-Exchange-between-Surfaces

Interchange factor for body 1 completely enclosed by body 2 (body 1 is large) is given by


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This Chapter Radiation-:-Exchange-between-Surfaces consists of the following topics

A large plane, perfectly insulated on one face and maintained at a fixed temperature T 1 on the bare face, has an emissivity of 0.84 and loses 250 W/m2 when exposed to surroundings at nearly 0 K. The radiant heat loss from another plane of the same size is 125 W/m2 when bare face having emissivity 0.42 and is maintained at temperature T 2 is exposed to the same surroundings. Subsequently these two planes are brought together so that the parallel bare faces lie only 1 cm apart and the heat supply to each is so regulated that their respective temperatures T 1 and T 2 remains unchanged. Determine he net heat flux between the planes

Interchange factor for body 1 completely enclosed by body 2 (body 1 is large) is given by

A thermos flask has a double walled bottle and the space between the walls is evacuated so as to reduce the heat flow. The bottle surfaces are silver plated and the emissivity of each surface is 0.025. If the contents of the bottle are at 375 K, find the rate of heat loss from the thermos bottle to the ambient air at 300 K

Interchange factor for body 1 completely enclosed by body 2 (body 1 is large) is given by

Radiation : Exchange between Surfaces

Heat-Transfer