A hot steam pipe, 5 cm in diameter and carrying steam at 150C, is placed in the

Question:

A hot steam pipe, 5 cm in diameter and carrying steam at 150ºC, is placed in the center of a 15-cm-thick slab of lightweight structural concrete. The outside of the concrete slab is exposed to a convection environment that maintains the top and bottom of the sheet at 20ºC. Calculate the heat lost per unit length of pipe.