Academic literature on the topic 'Hybrid Cryocoolers'

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Journal articles on the topic "Hybrid Cryocoolers"

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Liu, Z. Y., Y. X. Ma, J. Quan, Y. J. Liu, J. Wang, J. G. Li, and J. T. Liang. "Status and development trends of the space 2 K mechanical cryocooler." IOP Conference Series: Materials Science and Engineering 1240, no. 1 (May 1, 2022): 012028. http://dx.doi.org/10.1088/1757-899x/1240/1/012028.

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Abstract The space 2 K cryogenic technology is one of the critical supporting technologies for deep-space explorations. With the development of space detectors, such as infrared and X-ray detectors, the demands for the space 2 K cryogenic technology have become much more urgent. Early space detection missions used superfluid helium cryostats (SHCs) to meet their requirements. However, cryostats have been gradually replaced by the 2 K mechanical cryocoolers due to the large volume, heavy weight, and short life of cryostats. Hybrid JouleThomson (J-T) cryocoolers are the best alternative to cryostats in the 2 K mechanical cryocoolers because of their relatively higher efficiency at 2 K. This paper provides an up-to-date review of space missions involving 2 K hybrid J-T cryocoolers and a summary on the key issues that need to be solved in the 2 K J-T cryocoolers.
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Dongli, Liu, Tao Xuan, Sun Xiao, and Gan Zhihua. "Performance Study on ST/JT Hybrid Cryocoolers Working at Liquid Helium Temperature." Physics Procedia 67 (2015): 468–73. http://dx.doi.org/10.1016/j.phpro.2015.06.060.

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Hall, Timothy, Dan Wang, Huong Le, Holly Garich, and Majid Minary. "Electro-Codeposition of Composite Materials for Enhanced Thermal and Electrical Properties." ECS Meeting Abstracts MA2022-02, no. 23 (October 9, 2022): 969. http://dx.doi.org/10.1149/ma2022-0223969mtgabs.

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State of the art cryocoolers, high powered electronic systems, and space platforms require next generation high conductivity composite materials that can reduce product weight while improving performance. To meet this need, Faraday Technology with the help of Universities, National Labs, and industrial partners is developing a scalable electro-codeposition method to produce high conductivity hybrid graphene/copper composite materials. Specifically, this talk will highlight two activities ongoing at Faraday and demonstrate the feasibility of fabricating either composite or laminated graphene-copper hybrid foils or direct printed composite nanowires via a pulse electro-codeposition approach. These activities indicated these composite materials can achieve a greater than 50% reduction in sheet resistance and a ~50% increase in mechanical strain compared to Cu foils. Additionally, we identified a strong dependance of material surface roughness on the measurement of thermal conductivity when using the 3-ω technique in a Closed Cycle He Cryostat. We will also discuss the opportunity to produce a wide range of material shapes by enabling a direct print apparatus that combines x,y,z control methods with an electro-codeposition printhead. If successful we envision that method to print next generation composite materials like ‘covetics’ that have the potential to meet many of the electronics and space community’s needs by enabling in space structural repairs, fabrication of new electronic components or sensors, or be utilized as heat exchanger composite materials. Finally, this activity also identified commercial partners interested in integrating these next generation into high powered electronics like laser diodes or invertors for electric vehicles.
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Wang, Xiaotao, Yibing Zhang, Haibing Li, Wei Dai, Shuai Chen, Gang Lei, and Ercang Luo. "A high efficiency hybrid stirling-pulse tube cryocooler." AIP Advances 5, no. 3 (March 2015): 037127. http://dx.doi.org/10.1063/1.4915900.

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Watanabe, K., Satoshi Awaji, and Gen Nishijima. "High-Strength Nb3Sn Wire Development for Compact Superconducting Magnets." Materials Science Forum 546-549 (May 2007): 1841–48. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1841.

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A superconducting magnet with a magnetic energy of E = B2/2μo [J/m3] has to overcome a magnetic force of P = B2/2μo [Pa] in the same expression. This means that a high-field 20 T superconducting magnet produces an electromagnetic force of 160 MPa. In order to stand such a large force, Nb3Sn superconducting wires are usually reinforced by the hard-copper housing as an external reinforcement method or the stainless steel winding as a mechanical backup of an outermost Nb3Sn coil. If we focus on a compact superconducting magnet like a cryocooled superconducting magnet, a high-strength superconducting wire with a small diameter size of 1- 2 mm is required. The High-Field Laboratory for Superconducting Materials, IMR, Tohoku University has developed Nb3Sn wires internally reinforced with CuNb or CuNbTi composite. These high-strength Nb3Sn wires were successfully employed to construct the unique compact cryocooled 28 T hybrid magnet and the cryocooled 18 T high-temperature superconducting magnet. In addition, we found that the prebending effect for high-strength Nb3Sn wires outstandingly improves the Tc, Bc2 and Ic properties. As a next step, we intend to develop new Nb3Sn strand cables with the strong mechanical property of 500 MPa, applying the prebending effect for a future 22 T-φ400 mm room temperature bore superconducting magnet of a 50 T-class hybrid magnet.
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Kumar, Kishor V. V., and Biju T. Kuzhiveli. "Parametric investigation of hybrid regenerator of a stirling cryocooler." Indian Journal of Cryogenics 41, no. 1 (2016): 81. http://dx.doi.org/10.5958/2349-2120.2016.00010.8.

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Nellis, G. F., and J. R. Maddocks. "An isothermal model of a hybrid Stirling/reverse-Brayton cryocooler." Cryogenics 43, no. 1 (January 2003): 31–43. http://dx.doi.org/10.1016/s0011-2275(02)00153-4.

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Guo, Yongxiang, Yijun Chao, Bo Wang, Haiying Li, Sizhuo Li, John M. Pfotenhauer, and Zhihua Gan. "The thermodynamic characteristics of a Stirling/pulse tube hybrid cryocooler." Cryogenics 96 (December 2018): 133–43. http://dx.doi.org/10.1016/j.cryogenics.2018.10.011.

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Ma, Yuexue, Jia Quan, Juan Wang, Yanjie Liu, Jianguo Li, and Jingtao Liang. "Experimental Research on the JT Cycle of Hybrid 4.5K JT Cryocooler." IOP Conference Series: Materials Science and Engineering 502 (April 15, 2019): 012033. http://dx.doi.org/10.1088/1757-899x/502/1/012033.

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Hato, Tsunehiro, Akira Tsukamoto, Seiji Adachi, and Keiichi Tanabe. "Hybrid cooling system with cryocooler and liquid-nitrogen for HTS-SQUID system." Journal of Physics: Conference Series 1559 (June 2020): 012008. http://dx.doi.org/10.1088/1742-6596/1559/1/012008.

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Dissertations / Theses on the topic "Hybrid Cryocoolers"

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Kumar, Kranthi J. R. A. "Studies on Single and Two Stage Stirling Type Pulse Tube Coolers of Low and Medium Capacities including Performance Enhancement of Pressure Wave GeneratoI and a Novel Helium Recondensation System." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4224.

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Cryocoolers are mechanical devices that produce cold at temperatures below -150oC. Work required to produce the cold is supplied by a Pressure Wave Generator (PWG). This thesis is concerned with the development and analysis of Stirling type pulse tube cooler (PTC) systems of low and medium capacities along with performance improvement of PWG and design of a novel oil free and low maintenance helium recondensation system based on Stirling type pulse tube coolers and Joule-Thomson expansion. Pressure Wave Generator is a crucial part of pulse tube cooler system. Performance of PWG depends on many parameters like the seal gap, piston diameter etc. E ects of these parameters have been studied in detail. Analysis was done to arrive at optimal values and a methodology is suggested to improve performance. The analysis was applied extensively to indigenously developed Pressure Wave Generator (PWG-1). A signi cant improvement, reduced mechanical losses and lowered input electric current, has been found by application of the suggested methodology. The development of pulse tube coolers of low and medium capacities was studied. In low capacity coolers, the available PV power is low; thus, requiring an ultra e cient design. In medium capacity coolers, the available PV power can pose problems like acoustic matching, streaming etc. A low capacity pulse tube cryocooler capable of 0.5 W at 80 K and acoustically matched to indigenous Pressure Wave Generator PWG-1 was designed, fabricated and tested. Inertance tube con guration which plays signi cant role in low input power coolers has been analyzed. A no load temperature of 74 K was achieved with input power of 59 W; corresponding to a cooling power of 0.22 W at 80 K. The amplitude of mass ow passing into the pulse tube cooler has been measured by using a hot wire anemometer calibrated in oscillatory ow condition. A medium capacity pulse tube cryocooler capable of 10 W at 80 K was designed and developed. It requires an estimated input PV power of 375 W. On the other hand, the only available large PWG for this work, PWG-2, has a rated PV power output of 900 W at the rated piston stroke, thus posing the problem of acoustic matching. Improvement of acoustic matching between the PTC and PWG was studied by varying lling pressure, inertance tube con guration, and by using a long transfer line. A no load temperature of 72 K corresponding to 1 W at 80 K was achieved. It is concluded that steps to improve acoustic matching are useful only to a limited extent and acoustic matching has to be ensured at the design stage itself. A medium capacity two stage pulse tube cooler capable of reaching 25 K is described. Analytical proof has been given to shown that a two stage pulse tube cooler is thermo-dynamically less e cient than a single stage pulse tube cooler. But a two stage PTC is required to reduce regenerator losses. A no load temperature of 40.4 K was achieved at 24.1 bar lling pressure with an input power of 750 W. The e ects of pulse tube volume and regenerator con guration were experimentally investigated. The results point out the interplay of pressure drop and regenerator ine ectiveness losses. It is concluded that high mass ow from the PWG-2 is the reason for ine ectiveness of regenerator. A twin cooler design to reduce the mass ow of PWG-2 reaching the coldest stage has been proposed. A novel oil free and low maintenance helium recondensation system has been designed with a liquefaction rate of 17.86 liters per day corresponding to a cooling power of 0.53 W at 4.2 K. The system reaches liquid helium temperature by precooling helium gas in tube-in-tube heat exchangers, assisted by Stirling type pulse tube coolers operating at 80 / 25 K and two stage JT expansion. The cooling powers required of the pulse tube coolers are 14.22 at 80 K and 1.6 W at 25 K respectively. The twin cooler is capable of meeting these cooling power requirements. Design and development of tube-in-tube heat exchangers and JT valves are discussed.
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Fraser, Thomas L. "Design of a cryogenic turbine for a hybrid cryocooler." 2006. http://catalog.hathitrust.org/api/volumes/oclc/70215805.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2006.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 128-129).
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Evans, Jonathan Charles. "Hydrostatic journal bearings for a hybrid pulse-tube/reverse-Brayton cryocooler." 2003. http://catalog.hathitrust.org/api/volumes/oclc/54105651.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2003.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 76).
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Book chapters on the topic "Hybrid Cryocoolers"

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Price, K. D., and C. S. Kirkconnell. "Two Stage Hybrid Cryocooler Development." In Cryocoolers 12, 233–39. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_32.

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Levenduski, R., W. Gully, and J. Lester. "Hybrid 10 K Cryocooler for Space Applications." In Cryocoolers 10, 505–11. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47090-x_60.

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Levenduski, R., J. Lester, and E. Marquardt. "A Hybrid Multistage 10K Cryocooler for Space Applications." In Cryocoolers 12, 579–86. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_76.

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Nellis, G. F., J. R. Maddocks, A. Kashani, J. H. Baik, and J. M. Pfotenhauer. "A First Order Model of a Hybrid Pulse Tube/Reverse-Brayton Cryocooler." In Cryocoolers 12, 349–59. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_47.

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Kirkconnell, C. S., K. D. Price, K. J. Ciccarelli, and J. P. Harvey. "Second Generation Raytheon Stirling/Pulse Tube Hybrid Cold Head Design and Performance." In Cryocoolers 13, 127–31. Boston, MA: Springer US, 2005. http://dx.doi.org/10.1007/0-387-27533-9_18.

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Liu, Liqiang, Linghui Gong, Jingtao Liang, and Liang Zhang. "Numerical Study of a New Type of 4 K GM/PT Hybrid Refrigerator." In Cryocoolers 11, 265–72. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47112-4_35.

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Gully, W. J., D. S. Glaister, and D. W. Simmons. "Development of a 12 K Stirling Cycle Precooler for a 6 K Hybrid Cooler System." In Cryocoolers 11, 63–68. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47112-4_8.

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Conference papers on the topic "Hybrid Cryocoolers"

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Gully, W., D. S. Glaister, P. Hendershott, V. Kotsubo, J. S. Lock, E. Marquardt, J. G. Weisend, et al. "BALL AEROSPACE HYBRID SPACE CRYOCOOLERS." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP, 2008. http://dx.doi.org/10.1063/1.2908593.

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Kirkconnell, C. S. "Hybrid Stirling / Reverse Brayton and Multi-stage Brayton Cryocoolers for Space Applications." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2006. http://dx.doi.org/10.1063/1.2202572.

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Evans, Jonathan C., and Gregory F. Nellis. "Design and Test of Hydrostatic Gas Bearings for a Hybrid Cryogenic Refrigerator." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43070.

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A hybrid pulse-tube/reverse-Brayton cryocooler is being developed that integrates a regenerative, pulse-tube upper stage with a recuperative, reverse-Brayton lower stage using a flow rectification system consisting of check-valves and buffer volumes. This system shows the potential for high performance with high reliability and low mass, and simple electrical, mechanical, and thermal integration. The turbine in the reverse-Brayton stage will be supported on hydrostatic gas bearings. The performance of the hybrid cryocooler system is strongly dependent upon the performance of these bearings; in particular their stiffness and mass flow consumption. This is a unique application of hydrostatic bearings; the miniature bearings are operating at cryogenic temperatures using high pressure helium. This paper describes the theoretical model that was developed to predict journal bearing performance as geometry and operating conditions change. The model is verified against experimental measurements of stiffness and mass flow consumption for a prototypical set of journal bearings. The model is subsequently used to optimize a set of journal bearings for the cryogenic turbine and parametrically investigate the effect of journal bearing clearance on system performance.
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Evans, J. C. "Progress Toward a Pulse-tube/Reverse-Brayton Hybrid Cryocooler." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2006. http://dx.doi.org/10.1063/1.2202571.

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Diab, A. K. "Development of a Rectifying Interface for a Hybrid Pulse-Tube/Reverse-Brayton Cryocooler." In ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2004. http://dx.doi.org/10.1063/1.1774877.

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Ito, T. "Development of a 10 T Cryocooled Superconducting Magnet with a Room Temperature Bore of 360 mm for a 29 T Hybrid Magnet." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2006. http://dx.doi.org/10.1063/1.2202602.

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