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CONCLUSIONS A systematic thermodynamic study on Brayton refrigeration cycle is performed as a preliminary step to develop 10 kW cryocooler for long-length HTS cable systems. In ideal cycle, helium and neon are equally efficient, but in practical cycle, helium is superior to neon, especially when the operating pressure is higher than 1 MPa. By taking into account the performance of the compressor, expander, and heat exchangers, the Brayton refrigeration cycle for sub-cooling liquid nitrogen is simulated with Aspen HYSYS and real fluid properties to calculate FOM (figure of merit). With a design constraint to avoid the freezing of liquid nitrogen, the operating conditions are determined, and a complete refrigeration cycle is proposed for immediate cryocooler development. ACKNOWLEDGEMENTS This study was carried out as the Power Generation and Electricity Delivery Program by the support of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and by funding of the Ministry of Knowledge Economy (MKE) in Korea under No. 2009 T100200205. REFERENCES 1. Hirai, H., Suzuki, Y., Hirokawa, M., Kobayashi, H., Kamioka, Y., Iwakuma, M. and Shiohara, Y., Physica C. pp. 1857–1861 (2009). 2. Hirai, H., Hirokawa, M., Yoshida, S., Kamioka, Y., Takaike, A., Hayashi, H., Okamoto, H., and Shiohara, Y., “New Design of Neon Refrigerator for HTS Power Machines”, in Advances in Cryogenic Engineering 55A, AIP Press, Melville, New York, 2010, pp. 1131-1138. 3. Saji, N., Asakura, H., Yoshinaga, S., Ishizawa, T., Miyake, A., Obata, M. and Nagaya, S., “Design of Oil-Free Simple Turbo Type 65K/6KW Helium and Neon Mixture Gas Refrigerator for High Temperature Superconducting Power Cable Cooling”, in Advances in Cryogenic Engineering 47A, edited by DiPirro, et al., New York, 2002, pp. 893-902. 4. Breedlove, J. J., Magari, P. J. and Miller, G. W., “Cryocooler for Air Liquefaction Onboard Large Aircraft”, in Advances in Cryogenic Engineering 53A, edited by Weisend II, et al., New York, 2008, pp. 838-845. 5. Maguire, J. F. and Schmidt, F., IEEE Transactions on Applied Superconductivity, pp. 1787-1792 (2005). 6. Maguire, J. F., Yuan, J., Romanosky, W., Schmidt, F., Soika, R., Bratt, S., Durand, F., King, C., McNamara, J. and Welsh, T. E., IEEE Transactions on Applied Superconductivity, pp. 961-966 (2011). 7. Honjo, S., Mimura, T., Kitoh, Y., Noguchi, Y., Masuda, T., Yumura, H., Watanabe, W., Ikeuchi, M., Yaguchi, H. and Hara, T., IEEE Transactions on Applied Superconductivity, pp. 967- 971 (2011). 8. Yang, H. S., Kim, D. L., Sohn, S. H., Lim, J.H., Choi, Y.S. and Hwang, S.D., IEEE Transactions on Applied Superconductivity, pp. 1292-1295 (2010). 9. Chang, H. M., Chung, M. J., Kim, M. J. and Park, S. B., Cryogenics 49, pp. 226-234 (2009). 10. Chang, H. M., Kim, M. J., Lee, H. C., Shim, D. M., Sung H. J., and Park, S. B., “Operation Results of Methane Liquefaction Plant in Sudokwon Landfill Site,” The Proceedings of Korea Institute of Applied Superconductivity and Cryogenics (KIASC) Conference, 2010, p. 92. 11. Bejan,A.,AdvancedEngineeringThermodynamics,3rded.,JohnWiley&Sons,NewJersey,2006,pp. 101-142. 1671PDF Image | Thermodynamic design of 10 kW Brayton cryocooler for HTS cable
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