Abstract
To maintain the superconducting state of high temperature superconductor (HTS) used for power application, higher refrigeration capacity cryocooler (>2 kW @ 70 K) is required. A reverse Brayton cycle based cryocooler with long-life and high reliability is one of the suitable candidates for cooling of HTS. The basic reverse Brayton cryocooler can be modified of basic configuration in order to achieve higher FOM. An analytical study focused on modified configurations of reverse Brayton cycle for HTS has been carried out. Neon is selected as working fluid since it has higher heat capacity than helium around 70 K. Six reverse Brayton based modified cycles are standard cycle, 2-stage compression, 2-stage series expansion, 2-stage parallel expansion (same pressure ratio), 2-stage parallel expansion (different pressure ratio), and modified cycle with intermediate cooling system for recuperator. The performances of the modified reverse Brayton cryocoolers are compared and reasons for performance variations are identified.
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