An insulated steel pipe carries hot water at 80 ºC. The outersurface of the insulation loses heat to the environment byconvection and radiation. For convection, assume hconv = 5.8W/m2.ºC. The emissivity of the insulation is 0.88 and conductivity,k = 0.038 W/mK. The surroundings are at 30 ºC. Assume the innersurface of the insulation is at the water temperature. What is thesurface temperature of the insulation?
