KIT | KIT-Bibliothek | Impressum | Datenschutz

Turbo-Brayton Refrigerator of Yokohama HTS Cable Project

Nakamura, Naoko; Shimoda, Masahiro; Yaguchi, Hiroharu; Mimura, Tomoo


The operational stability and long term reliability of a High Temperature Superconducting (HTS) cable system combined with a liquid nitrogen cooling system was verified in the demonstration test performed in a real grid. The test was successfully implemented from October 29, 2012 till December 25, 2013. The HTS cable system reliability has been verified in the test, but some problems related to the refrigerators have also been revealed. To handle some problems we develop a refrigerator with a high efficiency and a long maintenance interval. Target characteristics we set are a maintenance interval of 30,000 hours, a COP of 0.1 and a cooling capacity of 5 kW. These target values were achieved using a reverse Brayton cycle and high performance turbo compressor and turbo expander units. Our cooling system utilizing this refrigerator has proved to be stable for long operation. This Turbo-Brayton refrigerator Neon gas was chosen as coolant based on its density and speed of sound. This refrigerator includes a three stage turbo compressor and a turbo expander. The heat of compression is removed by water through a heat exchanger. The heat exchanger for regeneration is set at the front of the turbo expander, while the heat exchanger for heat exchanging between neon gas and liquid nitrogen is located at the back of the expander. ... mehr

Volltext §
DOI: 10.5445/IR/1000075559
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Vortrag
Publikationsjahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-755590
KITopen-ID: 1000075559
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Veranstaltung 2nd International Workshop on Cooling Systems for HTS Applications (IWC-HTS), Karlsruhe, Germany, 13th - 15th September 2017
Bemerkung zur Veröffentlichung Author affiliation: Mayekawa
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page