A 20-mm thick draw batch furnace front is subjected to uniform heat flux on the inside surface, while the outside surface is subjected to convection and radiation heat transfer. Assuming that (1) heat conduction is steady; (2) one dimensional heat conduction across the furnace front thickness; (3) Thermal properties are constant; (4) inside and outside surface temperatures are constant. Determine the surface temperature T0 and TL based on the known conditions provided in the drawing.