Design of high-efficiency Joule-Thomson cycles for high-temperature superconductor power cable cooling |
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| Affiliation: | 1. Cryogenic Engineering Laboratory, Division of Mechanical Engineering, School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong–gu, Daejeon 34141, Republic of Korea;2. FAB Equipment R&D Team, Mechatronics R&D Center, Samsung Electronics Co., Ltd., 1-1, Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do 18448, Republic of Korea;3. Launcher Propulsion System Team, KSLV-II R&D Head Office, Korea Aerospace Research Institute, 169-84 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea;1. Federal University of Technology - Paraná, UTFPR—Department of Mechanics, 84016-210 Ponta Grossa, PR, Brazil;2. Federal University of Technology – Paraná, UTFPR—Department of Electronics, 84016-210 Ponta Grossa, PR, Brazil;3. Aeronautics Technological Institute, ITA —Department of Mechanics, 12228-900 São José dos Campos, SP, Brazil;1. Refrigeration and Air Conditioning Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;2. Department of Mechanical Engineering, Sree Vidyanikethan Engineering College, Tirupati 517102, India |
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| Abstract: | 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. |
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| Keywords: | Joule-Thomson High temperature superconductor (HTS) cable Cryogenic Nitrogen |
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