4.24 A long power transmission cable is buried at a depth (ground-to-cable-cente

Question

4.24 A long power transmission cable is buried at a depth
(ground-to-cable-centerline distance) of 2 m. The cable
is encased in a thin-walled pipe of 0.1-m diameter, and,
to render the cable superconducting (with essentially
zero power dissipation), the space between the cable
and pipe is filled with liquid nitrogen at 77 K. If
the pipe is covered with a superinsulator (ki =
0.005 W/mK) of 0.05-m thickness and the surface of
the earth (kg = 1.2 W/mK) is at 300 K, what is the
cooling load (W/m) that must be maintained by a cryogenic
refrigerator per unit pipe length?

Explanation / Answer

4.24 A long power transmission cable is buried at a depth (ground-to-cable-cente

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