Heat Transfer Q2. A hot steam pipe, with an inside surface temperature of 250°C, has an inside diameter of 8 cm and a wall thickness of 5.5 mm. It is covered with a 9-cm layer of insulation, which has a thermal conductivity (k) of 0.5 W/m·°C. This is followed by a 4-cm layer of insulation, which has a thermal conductivity (k) of 0.25 W/m·°C. The outside temperature of the insulation is 20°C. Assuming the thermal conductivity (k) of the pipe is 47 W/m·°C, calculate the heat lost per meter of length.