Problem: A furnace wall is constructed of fire brick, insulating brick and common brick, each of 10 cm thick. The temperatures of the inner and outer surfaces are 900°C and 40°C respectively. If the area of the furnace wall is 50 m?. What is the heat loss rate from the furnace? What is the temperature at the junction at the fire brick and insulating brick? Data given, Thermal conductivity of fire brick = 1 kcal/hr. m°C Thermal conductivity of insulating brick = 0.078 kcal/hr. mC Thermal conductivity of common brick = 0.6 kcal/hr. m°C

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