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Radiation-:-Exchange-between-Surfaces

A large plane, perfectly insulated on one face and maintained at a fixed temperature T 1 on 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 anor plane of same size is 125 W/m2 when bare face having emissivity 0.42 and is maintained at temperature T 2 is exposed to same surroundings. Subsequently se two planes are brought toger so that parallel bare faces lie only 1 cm apart and heat supply to each is so regulated that ir respective temperatures T 1 and T 2 remains unchanged. Determine he net heat flux between planes


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Consider a system of concentric spheres of radius r 1 and r 2 (r 2 is greater than r 1). If r 1 = 5 cm, determine the radius r 2 if it is desired to have the value of shape factor F 21 equal to 0.6
Consider a system of concentric spheres of radius r 1 and r 2 (r 2 is greater than r 1). If r 1 = 5 cm, determine the radius r 2 if it is desired to have the value of shape factor F 21 equal to 0.6\r\n

A large plane, perfectly insulated on one face and maintained at a fixed temperature T 1 on 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 anor plane of same size is 125 W/m2 when bare face having emissivity 0.42 and is maintained at temperature T 2 is exposed to same surroundings. Subsequently se two planes are brought toger so that parallel bare faces lie only 1 cm apart and heat supply to each is so regulated that ir respective temperatures T 1 and T 2 remains unchanged. Determine he net heat flux between planes

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

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

Radiation : Exchange between Surfaces

Heat-Transfer