Operating characteristics of cooling underground power cables using up sloped long heat pipes in conduit
Abstract
Long heat pipes for cooling electric power cables in conduit pipe are required to operate not only in the down slope but also in the up slope. The stable operation of the heat pipe is attained by separating the vapor flow path and the liquid flow path completely, and returning the working fluid condensed by the radiator to the evaporation section end by utilizing a difference in the pressure head. Evaporating section consisting of corrugated metallic pipes and carbon fiber wicks were employed for liquid film evaporation and holding liquid uniformly along an axial length of the pipe. Long heat pipes with a length 100 m, outside diameter 70 mm, and up slope 1/100 were made experimentally and tested. They operated in the normal heat pipe mode, carrying heat 9kW. Further the heat pipes were layed in some cable conduits providing adequate cooling effect.
- Publication:
-
Tokyo Symposium on Mechanics for Space Flight
- Pub Date:
- 1985
- Bibcode:
- 1985tmsf.proc.....O
- Keywords:
-
- Cooling;
- Heat Pipes;
- Pipe Flow;
- Power Lines;
- Underground Transmission Lines;
- Condensing;
- Evaporation;
- Heat Flux;
- Slopes;
- Temperature Distribution;
- Two Phase Flow;
- Fluid Mechanics and Heat Transfer