a. Steam at 230oC flows through a steel pipe (� = 15��/�.

Question

) whose inner and outer
diameters are 9 cm and 10 cm, respectively in an environment at 15oC. The pipe is
insulated with 5 cm thick fiberglass (� = 0.035��/�.
). The given heat transfer
coefficients on the inside and the outside of the pipe are 170��/��.
and 38��/
��.
respectively.
Calculate the heat transfer rate across the steel pipe.