The cooling systems of High-Temperature Superconducting (HTS) power transmission cables are unable to achieve the desired performance as prescribed in the cryogenic road map. Reverse Brayton cycle based Cryocooler (RBC) has been identified as a refrigerator that has the potential to achieve the desired performance for higher cooling load demand. In this article, an exergy analysis of the basic Reverse Brayton Cycle (RBC) and its modifications has been investigated for identification of appropriate cycle configuration that will meet the demand for practical applications of HTS cables. The modifications in the basic cycle are carried out with different arrangements of turbines such as parallel or series expansion that may increase the exergy efficiency of the cooling system with a heat load of 10 kW @ 65 K. The analysis is carried out using Aspen HYSYS V8.6, and helium is used as a working fluid. The effects of important process parameters such as pressure ratio, compressor inlet pressure, and flow diversion on the performance are investigated and are used to optimize these cycles. The best cycle configuration based on RBC is identified and recommended based on the results of the analysis.

高温超导（HTS）输电电缆的冷却系统无法实现低温路线图中规定的所需性能。基于反向布雷顿循环的低温制冷器（RBC）已被确定为一种冰箱，它有可能实现更高的制冷负荷需求所需的性能。在本文中，已经对基本的反向布雷顿循环（RBC）及其修改进行了火用分析，以识别合适的循环配置，以满足HTS电缆的实际应用需求。基本循环中的修改是通过不同的涡轮机布置（例如并联或串联膨胀）进行的，在65 K的热负荷为10 kW的情况下，这可能会提高冷却系统的火用效率。使用Aspen HYSYS V8.6进行分析，并使用氦气作为工作流体。研究了重要工艺参数（例如压力比，压缩机入口压力和分流）对性能的影响，并将其用于优化这些循环。根据分析结果确定并推荐基于RBC的最佳循环配置。