Patent Number: 8,872,022

Title: Phase-change cooling of subterranean power lines

Abstract: A cooling system for a subterranean power line may include a cooling tube configured to house a fluid. Heat generated by the subterranean power line may be radiated and/or conducted to the cooling tube and absorbed by the fluid within the cooling tube. As the fluid heats up, it may change phase from a liquid to a gas. The hot gas may rise to a heat-exchanging condenser configured to dissipate the heat and condense the fluid back into a liquid. The cool, condensed liquid my return from the heat-exchanging condenser to the cooling tube. Risers, gas transport tubes, pressure regulation systems, fluid storage tanks, and other components described herein may increase the efficiency of the cooling system and/or otherwise improve the viability of the cooling system for subterranean power lines.

Inventors: Hyde; Roderick A. (Redmond, WA), Kare; Jordin T. (Seattle, WA), Myhrvold; Nathan P. (Bellevue, WA), Tuckerman; David B. (Lafayette, CA), Wood, Jr.; Lowell L. (Bellevue, WA)

Assignee: Elwha LLC

International Classification: H02G 3/03 (20060101); H05K 7/20 (20060101)

Expiration Date: 2018-10-28 0:00:00