A furnace of 70- by 60- by 90-cm inside dimensions is constructed of a material having a thermal conductivity of 1.05 kJ/kg °C. The wall thickness is 15 cm. The inner and outer surface temperatures...

A furnace of 70- by 60- by 90-cm inside dimensions is constructed of a material having a
thermal conductivity of 1.05 kJ/kg °C. The wall thickness is 15 cm. The inner and outer
surface temperatures are 500 and 100 °C, respectively. Calculate the heat loss through the
furnace wall.