Ahot steam pipe, 5 cm in diameter and carrying steam at 150◦C, 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...

Ahot steam pipe, 5 cm in diameter and carrying steam at 150◦C, 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 20◦C. Calculate the heat lost per unit length of pipe.