Development of a turbine cryocooler for high temperature superconductor applications

Hirai, Hirokazu; Suzuki, Yoshiaki; Hirokawa, M.; Kobayashi, Hisanori; Kamioka, Yasuharu; Iwakuma, Masataka; Shiohara, Y.

doi:10.1016/j.physc.2009.05.125

Cited by 29 publications

(14 citation statements)

References 8 publications

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“…Therefore, employing high-efficiency turboexpander with gas bearing and compact heat exchanger, the reverse Brayton refrigerator could realize small size, light weight, long life, high operating reliability, wide range of refrigeration temperature and cooling capacity. Thus, it has been widely applied in many fields, such as space applications [3], environment simulation [4], air-conditioning [5], heat pump [6], and superconducting [7,8]. With working fluid of air, the reverse Brayton air refrigerator has special advantages of no pollution, easy access, and low cost.…”

Section: Introductionmentioning

confidence: 99%

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Study on the coupling performance of a turboexpander compressor applied in cryogenic reverse Brayton air refrigerator

Yang

Chen

et al. 2016

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

“…Much research has been done to enhance the flexibility of the refrigerator. Hiraia et al [8] developed a turbo-compressor to control the cooling capacity. Deserranno et al [9] designed a Brayton cryocooler for ZBO liquid hydrogen storage in space.…”

Section: Introductionmentioning

confidence: 99%

Study on the coupling performance of a turboexpander compressor applied in cryogenic reverse Brayton air refrigerator

Yang

Chen

et al. 2016

Energy Conversion and Management

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“…A cooling system is essential to keep superconductivity of HTS applications. A cooling system is needed to produce cooling power from 2 kW to 10 kW at cooling temperature of 65 K, and have high COP (Coefficient of Performance), long maintenance interval and compactness [5].…”

Section: Introductionmentioning

confidence: 99%

“…A prototype turbo-Brayton cycle refrigerator for HTS applications cooling was developed in 2007 [5]. The prototype refrigerator using neon gas as working fluid was composed of a turbo-expander with dynamic gas bearing and a reciprocating compressor.…”

Section: Introductionmentioning

confidence: 99%

Neon turbo-Brayton cycle refrigerator for HTS power machines

Hirai¹,

Hirokawa²,

Yoshida³

et al. 2012

AIP Conference Proceedings

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Design of oil-free simple turbo type 65 K/6 KW helium and neon mixture gas refrigerator for high temperature superconducting power cable cooling AIP Conference Proceedings 613, 893 (2002) ABSTRACTWe developed a prototype turbo-Brayton refrigerator whose working fluid is neon gas. The refrigerator is designed for a HTS (High Temperature Superconducting) power transformer and its cooling power is more than 2 kW at 65 K. The refrigerator has a turboexpander and a turbo-compressor, which utilize magnetic bearings. These rotational machines have no rubbing parts and no oil-components. Those make a long maintenance interval of the refrigerator. The refrigerator is very compact because our newly developed turbo-compressor is volumetrically smaller than a displacement type compressor in same operating specification. Another feature of the refrigerator is a wide range operation capability for various heat-loads. Cooling power is controlled by the input-power of the turbo-compressor instead of the conventional method of using an electric heater. The rotational speed of the compressor motor is adjusted by an inverter. This system is expected to be more efficient. We show design details, specification and cooling test results of the new refrigerator in this paper.

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“…These applications require a cooling system that has cooling power from 2 kW to 10 kW at the temperature of 70 K and is able to achieve long maintenance interval [5]. Most of conventional cryocoolers, such as Stirling, GiffordMcMahon (G-M) and pulse tube cryocoolers, have cooling capacity from several W up to 1 kW, and first two coolers have a reciprocating displacer as well as reciprocating compressor.…”

Section: Introductionmentioning

confidence: 99%

Development of a Neon Cryogenic Turbo-Expander With Magnetic Bearings

Hirai¹,

Hirokawa²,

Yoshida³

et al. 2010

AIP Conference Proceedings

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Design of oil-free simple turbo type 65 K/6 KW helium and neon mixture gas refrigerator for high temperature superconducting power cable cooling AIP Conference Proceedings 613, 893 (2002) ABSTRACTA cryogenic turbo-expander with active magnetic bearings was made and tested in a reverse-Brayton cycle refrigerator using neon as working fluid. Turbine isentropic efficiency is a very important factor for the refrigerator since it affects the performance of the refrigerator significantly. Properties of neon are suitable for the working fluid in a refrigerator to cool HTS (High Temperature Superconducting) applications. The neon refrigerator needs a very small and high speed turbo-expander. But there are few studies of isentropic efficiencies of cryogenic turbo-expander using neon gas. Thus the experiment to get the design information was carried out. A prototype of neon refrigerator was made for HTS applications in 2007. Its cooling power was 2 kW at temperature of 70 K and operated in process pressure between 2 MPa and 1 MPa. To improve the performance of the neon refrigerator, the process pressure was changed to 1 MPa ~ 0.5 MPa. Under this process pressure, isentropic efficiencies for two types of turbine impellers were obtained. The test results were included in to the turbine design program so that we could predict the isentropic efficiencies of the turbo-expander more accurately. Details of the turbo-expander design and test results are described in this report.

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Development of a turbine cryocooler for high temperature superconductor applications

Cited by 29 publications

References 8 publications

Study on the coupling performance of a turboexpander compressor applied in cryogenic reverse Brayton air refrigerator

Study on the coupling performance of a turboexpander compressor applied in cryogenic reverse Brayton air refrigerator

Neon turbo-Brayton cycle refrigerator for HTS power machines

Development of a Neon Cryogenic Turbo-Expander With Magnetic Bearings

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