An electric heater in the form of a 50 by 100 cm plate is laid on top of a semi infinite insulating material having a thermal conductivity of 0 74W m C The heater plate is maintained at a constant temperature of 120C over all its surface, and the temperature of the insulating material a large dista...

An electric heater in the form of a 50- by-100-cm plate is laid on top of a

Question:

An electric heater in the form of a 50- by-100-cm plate is laid on top of a semi-infinite insulating material having a thermal conductivity of 0.74W/m· ºC. The heater plate is maintained at a constant temperature of 120ºC over all its surface, and the temperature of the insulating material a large distance from the heater is 15ºC. Calculate the heat conducted into the insulating material.