Calculate the outer wall surface temperature and the temperature distribution in a thick-walled hollow cylinder when the inner wall temperature is 120 °C and the outer wall is exposed to a convection environment of 25 °C with a surface heat transfer coef- ficient of 20 W/m2 °C. The inner and outer radii of the hollow cylinder are 30 cm and 60 cm respectively. The thermal conductivity of the material of the hollow cylinder is 20 W/m °C. Use one linear element and two linear elements for the solution. Compare the results with the analytical solution.