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THERMODYNAMIC DESIGN OF 10 KW BRAYTON CRYOCOOLER FOR HTS CABLE H.M. Chang1, C.W. Park1, H.S. Yang2, S.H. Sohn2, J.H. Lim2, S.R. Oh2, and S.D. Hwang2 1Hong Ik University Seoul, 121-791, Korea 2KEPCO Research Institute Daejeon, 305-760, Korea ABSTRACT Thermodynamic design of Brayton cryocooler is presented as part of an ongoing governmental project in Korea, aiming at 1 km HTS power cable in the transmission grid. The refrigeration requirement is 10 kW for continuously sub-cooling liquid nitrogen from 72 K to 65 K. An ideal Brayton cycle for this application is first investigated to examine the fundamental features. Then a practical cycle for a Brayton cryocooler is designed, taking into account the performance of compressor, expander, and heat exchangers. Commercial software (Aspen HYSYS) is used for simulating the refrigeration cycle with real fluid properties of refrigerant. Helium is selected as a refrigerant, as it is superior to neon in thermodynamic efficiency. The operating pressure and flow rate of refrigerant are decided with a constraint to avoid the freezing of liquid nitrogen. KEYWORDS: HTS cable, Brayton cycle, cryocooler, thermodynamics, liquid nitrogen. INTRODUCTION The Korean HTS cable project plans to construct and test a 1 km HTS cable within the next 2-3 years. In accordance with the development of HTS cable system, a large- capacity cryocooler for continuously cooling liquid nitrogen is immediately needed for closed-cycle refrigeration. The amount of thermal load is tentative until the detailed design of cable system is completed, but is estimated to be around 10 kW at 65 K for the transmission-class cable system in grid. As no commercial cryocoolers with this capacity are readily available, it is decided to design, construct, and test a Brayton cooler in Korea. Advances in Cryogenic Engineering AIP Conf. Proc. 1434, 1664-1671 (2012); doi: 10.1063/1.4707099 © 2012 American Institute of Physics 978-0-7354-1020-6/$0.00 1664PDF Image | Thermodynamic design of 10 kW Brayton cryocooler for HTS cable
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