HW #4 - P #4 - Conduction and Convection Heat Transfer

A flat surface is covered with insulation with a thermal conductivity of 0.08 W/m-K. The temperature at the interface between the surface and the insulation is 300°C. The outside of the insulation is exposed to air at 30°C and the convective heat transfer coefficient between the insulation and the air is 10 W/m2-K. Ignoring radiation, determine the minimum thickness of insulation in meters such that the outside surface of the insulation is not hotter than 60°C at steady-state.