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Development of a turbine-compressor for 10 kW class neon turbo-Brayton refrigerator Hirokazu. Hirai, Masaki. Hirokawa, Shigeru. Yoshida, Tomonobu, Sano and Shinsuke. Ozaki Taiyo Nippon Sanso Corporation, 10 Okubo, Tsukuba, Ibaraki, 300-2611 Japan Abstract. We are developing 10 kW class turbo-Brayton refrigerator whose working fluid is neon gas. Its high pressure value is 1 MPa and its low pressure value is 0.5 MPa. The refrigerator consists of two turbine-compressors and a heat exchanger. The turbine-compressor has a turbo-expander on one side of its shaft and a turbo-compressor on the other side of the shaft. Two turbo-compressors are connected in series and two turbo-expanders are set in parallel. So, all amount of neon gas is compressed by two stages and each half a mount of neon gas is expanded by one stage. Two turbine- compressors are the same machines and development cost and time are minimized. In this stage, we made one prototype turbine-compressor and installed it in a performance test facility. This paper shows details of the turbine-compressor and refrigerator cooling power simulation results. Keywords: Turbo-Brayton refrigerator, Turbo-expander, Turbo-compressor, HTS INTRODUCTION Practical HTS power applications such as a power cable, a current limiter, a transformer and a motor have been studied actively [1-4]. HTS applications require a suitable cooling system which has cooling capacity from 2 kW to 10 kW at 70 K, is compact and has high performance. A turbo-Brayton refrigerator is adequate cooling system for cooling HTS power applications, and we have developed a 2 kW class turbo-Brayton refrigerator using neon gas as working fluid in 2012 [5]. However, in case of demonstrating HTS power cables at a real grid, such as ICHEON cable project (Korea) and YOKOHAMA cable project (Japan), a 5 kW class cooling system is adopted for cooling HTS power cable [6-7]. And HTS power cable project at length of 1 km class is considered recently, required cooling capacity will be changed to 10 kW class in length of 1km class HTS cable project. The back ground is our motivation to develop a 10 kW class turbo-Brayton refrigerator for HTS power cable. Cooling capacity of the turbo- Bayton refrigerator is 10 kW at 70 K and two turbine-compressors are adopted for compression and expansion of working fluid in the Brayton refrigerator. Process simulation of the turbo-Brayton refrigerator was done and a prototype turbine-compressor was made for evaluating performance. Process simulation results and detail of the prototype turbine-compressor are described in this paper. 10 KW CLASS REFRIGERATOR DESIGN A cooling system flow diagram is shown in Figure 1 and specification of the refrigerator is shown in Table 1. A cooling system consists of two turbine-compressors which are mentioned later, a main heat-exchanger, a sub-cool Main heat exchanger 3 Expansion turbine 4 5 6 LN pump HTS machine 7 Sub-cooled LN Neon gas Compressor 21 Sub-cool heat exchanger FIGURE 1. A cooling system flow diagram Advances in Cryogenic Engineering AIP Conf. Proc. 1573, 1236-1241 (2014); doi: 10.1063/1.4860847 © 2014 AIP Publishing LLC 978-0-7354-1201-9/$30.00 1236PDF Image | turbine-compressor 10 kW class neon turbo-Brayton refrigerator
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