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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 01m diameter and to render the cable super

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/m ∙ K) of 0.05-m thickness and the surface of the earth (kg = 1.2 W/m∙ K) is at 300 K, what is the cooling load (W/m) that must be maintained by a cryogenic refrigerator per unit pipe length?

 

Jun 27 2020 View more View Less

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