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Turbo-Compressor

Φ32- Impeller. Neon Turbo-Brayton Refrigerator Package. Specification Cooling Power: 2kW @ 65 K Input Power: 48 kW. Turbo-Compressor. Turbo-Expander (not seen). Neon Gas Circulation Type. Turbo-Compressor. Heat Exchanger. Cold Box. After Cooler. 2,500mm. Heat Exchanger. Cold Box.

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Turbo-Compressor

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  1. Φ32- Impeller Neon Turbo-Brayton Refrigerator Package Specification Cooling Power: 2kW @ 65 K Input Power: 48 kW Turbo-Compressor Turbo-Expander (not seen) Neon Gas Circulation Type Turbo-Compressor Heat Exchanger Cold Box After Cooler 2,500mm Heat Exchanger Cold Box Turbo- Expander Package Inter Cooler Cold Neon Gas 1,550mm 2,350mm

  2. LN circulation package LN circulation package Flow Diagram Application of LN circulation package Neon refrigerator package LN Circulation Neon gas Turbo- compressor Cold box FRP Cryostat Heat exchanger Neon Refrigerator Package Turbo- expander Sub cooler HTS application LN LN In-line pump

  3. NEDO“DemonstrationProjectforHTSCable” Cooling system of Asahi S/S ■ Stirling refrigerator with 1 kW@77 K ■6 refrigerators are arranged along 3 parallel lines toreduce pressure loss at heat exchangers. ■ 2 refrigerators are kept in reserve. Operation test in real grid has been going on since October 29, 2012. HTS cable and cooling system operations arenow proceeding smoothly.

  4. Turbo-Brayton refrigerator（Underdevelopment） ■Desired specifications of the refrigerator. ● Capacity is 5 ~ 20 kW (First target is 5 kW) ● COP (Coefficient Of Performance) is 0.1 ●Maintenance interval is over 30,000 hours Impelｌers of the Compressors andExpander ColdBox CompressorUnit

  5. Liquid nitrogen Fine solid nitrogen Generated by Freeze Thaw method Centrifugal pump Refrigerator pre-cooling cryostat Generator Flow meter Transfer tube New cooling system Let me propose a new refrigerant “Slush Nitrogen (SN2)”. SN2 is mixture of liquid nitrogen and solid nitrogen particles. SN2 has advantages as a refrigerant for HTS materials. (1) Due to the latent heat of melting solid nitrogen, SN2 has a greater heat capacity than LN2. (2) HTS materials in SN2 can operate stably around 63 K, as SN2 keeps the temperature at 63 K. We set up a SN2 circulation system and succeeded the SN2 flowing.

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