Pressurized steam at 400 K flows through a long, thin- walled pipe of 0.6-m diameter. The pipe is enclosed in a concrete casing that is of square cross section and 1.75 m on a side. The axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 300 K. What is the rate of heat loss per unit length of pipe

Explanation:

assume steady state conditions, negligible steam side convention resistance, pipe wall resistance and contact resistance i.e

and constant properties of concrete (300 k);

the heat rate can be expressed as

the shape factor is

insert values

  ( rate of heat loss per unit length)

answer:

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