If the steam line described in Problem 20.40 is bare and surrounded by still air at 70 F, what total heat transfer would be predicted from a 20-ft length of bare pipe? Consider the bare pipe to be a...

If the steam line described in Problem 20.40 is bare and surrounded by still air at 70F, what total heat transfer would be predicted from a 20-ft length of bare pipe? Consider the bare pipe to be a black surface and the surroundings black at 70F.

Problem 20.40

Steam at 400 psi, 800F flows through a 1-in. schedule140 steel pipe at a rate of 10; 000 lb_m/h: Estimate the value of h that applies at the inside pipe surface.