| 摘要 |
Thermally contacting, oppositely streaming, cryogenic fluid streams in the same enclosure in a closed cycle that changes the fluid from a cool high pressure helium gas to a cooler reduced pressure helium gas in an expander so as to be at different temperature ranges and pressures respectively in go and return legs that are in thermal contact with each other and in thermal contact with a longitudinally extending superconducting transmission line enclosed in the same cable enclosure that insulates the line from the ambient at a temperature T1. By first circulating the fluid from a refrigerator at one end of the line as a cool gas at a temperature range T2 to T3 in the go leg, then circulating the gas through an expander at the other end of the line where the gas becomes a cooler gas at a reduced pressure and at a reduced temperature T4 and finally by circulating the cooler gas back again to the refrigerator in a return leg at a temperature range T4 to T5, while in thermal contact with the gas in the go leg, and in the same enclosure therewith for compression into a higher pressure gas at T2 in a closed cycle, where T2>T3 and T5>T4, the fluid leaves the enclosure in the go leg as a gas at its coldest point in the go leg, and the temperature distribution is such that the line temperature decreases along its length from the refrigerator due to the cooling from the gas in the return leg.
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