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Design of high-efficiency Joule-Thomson cycles for high-temperature superconductor power cable cooling

机译：高效超导电力电缆冷却高效Joule-Thomson循环设计

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摘要

Liquid nitrogen (LN2) is commonly used as the coolant of a high temperature superconductor (HTS) power cable. The LN2 is continuously cooled by a subcooler to maintain an appropriate operating temperature of the cable. This paper proposes two Joule-Thomson (JT) refrigeration cycles for subcooling the LN2 coolant by using nitrogen itself as the working fluid. Additionally, an innovative HTS cooling cycle, of which the cable coolant and the refrigerant are unified and supplied from the same source, is suggested and analyzed in detail. Among these cycles, the highest COP is obtained in the JT cycle with a vacuum pump (Cycle A) which is 0.115 at 78 K, and the Carnot efficiency is 32.8%. The integrated HTS cooling cycle (Cycle C) can reach the maximum COP of 0.087, and the Carnot efficiency of 24.8%. Although Cycle C has a relatively low cycle efficiency when compared to that of the separated refrigeration cycle, it can be a good alternative in engineering applications, because the assembled hardware has few machinery components in a more compact configuration than the other cycles.
机译：液氮（LN2）通常用作高温超导体（HTS）电力电缆的冷却剂。通过过冷器连续冷却LN2以保持电缆的适当工作温度。本文提出了通过使用氮本身作为工作流体过冷却LN2冷却剂的joule-thomson（jt）制冷循环。另外，详细建议并详细地分析了一种创新的HTS冷却循环，其中电缆冷却剂和制冷剂从相同的源统一和供应。在这些循环中，在JT循环中获得最高COP，真空泵（循环A）为0.115，在78k，圆形效率为32.8％。集成的HTS冷却循环（循环C）可以达到0.087的最大COP，并且钟表效率为24.8％。尽管与分离的制冷循环相比，循环C具有相对低的循环效率，但它可以是工程应用中的替代方案，因为组装的硬件在比其他周期更紧凑的配置中的机器组件很少。

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