Study of neon heat flux in thermosyphon cooling system for high-temperature superconducting machinery

2019 ◽  
Vol 142 ◽  
pp. 258-265 ◽  
Author(s):  
K. Yamaguchi ◽  
M. Miki ◽  
E. Shaanika ◽  
M. Izumi ◽  
Y. Murase ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
Cooling System ◽  
High Temperature Superconducting

Flux Leakage Reduction in Linear Vernier Generators Using High-Temperature Superconducting Elements

Vestnik MEI ◽  
2021 ◽  
pp. 82-90
Author(s):  
Andrey A. Drozdov ◽  
◽  
Pavel A. Kurbatov ◽  
Ekaterina P. Kurbatova ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plants ◽  
Cooling System ◽  
Magnetic Moments ◽  
Interaction Force ◽  
Wave Power ◽  
Power Performance ◽  
High Temperature Superconducting ◽  
Motion Speed ◽  
Generator Design

The article presents the results of studies aimed at improving the power performance indicators of linear electric generators for wave power plants by reducing the flux leakages using high-temperature superconducting (HTS) inserts placed in between the teeth. The generator design involving application of the Vernier principle for magnetic flux modulation with a translator in the form of a hollow cylinder is considered. Generators of this type are used in float wave power plants driven directly by a reciprocating float, which transmits large forces at a low motion speed. The calculations were carried out using the HTS properties modeling procedure based on representing the currents induced in a superconductor in the form of magnetic moments of these currents, which made it possible to simplify the analysis of the electromagnetic field in the generator without significant additional errors. As a result, the characteristics of the electromagnetic force longitudinal components and phase winding flux linkages versus the translator displacement have been obtained. The use of HTS inserts and a distributed winding in the stator made it possible to reduce the electromagnetic leakage losses and increase the interaction force between the stator and translator. However, since the additional outlays for the cooling system and thermal insulation of the HTS elements are commensurable with the generator cost, the obtained results on improving the power performance parameters do not allow an unambiguous statement to be made about the effectiveness of the considered technical solutions.

Development of High Speed and High Temperature Atomic Layer Thermopiles

2019 ◽  
Author(s):  
Lakshya Bhatnagar ◽  
Guillermo Paniagua
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
High Speed ◽  
Cooling System ◽  
Numerical Study ◽  
Measurement Data ◽  
Atomic Layer ◽  
Heat Fluxes ◽  
Heat Transfer Analysis ◽  
Uncertainty Estimates

Abstract This work aims to provide a technique with which high frequency heat flux measurement data can be acquired in systems with high operational temperatures and high-speed flows with quantifiable and accurate uncertainty estimates. This manuscript presents the detailed calibration and application of an atomic layer thermopile, for heat fluxes with a frequency bandwidth of 0 to 1MHz. Two calibration procedures with a detailed uncertainty analysis. The first procedure consists using a laser to deliver radiation heat flux, while the second consists of a convective heat blowdown experiment. The use of this probe is demonstrated in a high-speed environment at Mach 2. The sensor effectively captures the passage of the normal shock wave and the values are compared with those computed using surface temperature measurement. Finally, a numerical study is carried out to design a cooling system that will allow the sensor to survive in high temperature conditions of 1273K while the sensor film is maintained at 323K. A two-dimensional axisymmetric conjugate heat transfer analysis is carried out to obtain the desired geometry.

scholarly journals Thermo-Hydraulic Analysis of a Tri-Axial High-Temperature Superconducting Power Cable with Respect to Installation Site Geography

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3898
Author(s):  
Youngjun Choi ◽  
Dongmin Kim ◽  
Changhyung Lee ◽  
Duyeon Won ◽  
Jaeun Yoo ◽  
...  
Keyword(s):  
High Temperature ◽  
Urban Areas ◽  
Cooling System ◽  
Power Cable ◽  
Cfd Analysis ◽  
Power Cables ◽  
Hydraulic Analysis ◽  
Long Distance ◽  
High Temperature Superconducting ◽  
Return Path

Various high-temperature superconducting (HTS) power cables are being developed or are ready for commercial operation to help energy suppliers meet the growing power demand in urban areas. Recently, triaxial HTS power cables have been developed by Korea Electric Power Corporation (KEPCO) and LS Cable & System. Further, KEPCO has been planning to install a 2 km long 23 kV/60 MVA triaxial HTS power cable to connect the Munsan and Seonyu substations and increase the stability of the power grid. The HTS power cables should be cooled down to a cryogenic temperature near 77 K. A thermo-hydraulic analysis of the cooling system considering the geographical characteristics of the installation site is essential for long-distance sections. This paper describes the thermo-hydraulic analysis of the triaxial HTS power cable to determine the proper mass flow rates of subcooled liquid nitrogen that meet the operating temperature and pressure of the cable for four configurations of cooling systems: (1) a single cooling system with an external return path, (2) a dual cooling system with an external return path, (3) a single cooling system with an internal return path, and (4) a dual cooling system with internal return path. Since the flow characteristics in a corrugated cable cryostat differ significantly from those in a typical annular tube, a computational fluid dynamics (CFD) analysis was conducted to estimate the pressure drop along the cable cryostat. With the CFD analysis and given heat loads in the cable, the temperature and the pressure variations along the cable were calculated and their pros and cons were compared for each configuration of the cooling system. This thermo-hydraulic analysis will be referenced in the actual installation of the HTS power cable between the Munsan and Seonyu substations.

Analysis and Design of Cooling System in High Temperature Superconducting Synchronous Machines

2007 ◽  
Vol 17 (2) ◽  
pp. 1557-1560 ◽  
Author(s):  
Biao Chen ◽  
Guo-Biao Gu ◽  
Guo-Qiang Zhang ◽  
Fu-Chuan Song ◽  
Cai-Hong Zhao
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Synchronous Machines ◽  
Analysis And Design ◽  
High Temperature Superconducting

Thermal Design of a Cryogenics Cooling System for a 10 MW-Class High-Temperature Superconducting Rotating Machine

2015 ◽  
Vol 25 (3) ◽  
pp. 1-5 ◽  
Author(s):  
Thanh Dung Le ◽  
Ji Hyung Kim ◽  
Sa Il Park ◽  
Dong-Hyung Kang ◽  
Haigun Lee ◽  
...  
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Thermal Design ◽  
High Temperature Superconducting ◽  
Rotating Machine

Superconducting Wind Generators with Capacities of 10 MW and Larger

2020 ◽  
Vol 10 (10) ◽  
pp. 59-67
Author(s):  
Victor N. ANTIPOV ◽  
◽  
Andrey D. GROZOV ◽  
Anna V. IVANOVA ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Wind Power ◽  
State Of The Art ◽  
Superconducting Materials ◽  
Commercial Application ◽  
Synchronous Generators ◽  
High Temperature Superconducting ◽  
Wind Generators ◽  
Main Factor

The overall dimensions and mass of wind power units with capacities larger than 10 MW can be improved and their cost can be decreased by developing and constructing superconducting synchronous generators. The article analyzes foreign conceptual designs of superconducting synchronous generators based on different principles: with the use of high- and low-temperature superconductivity, fully superconducting or only with a superconducting excitation system, and with the use of different materials (MgB2, Bi2223, YBCO). A high cost of superconducting materials is the main factor impeding commercial application of superconducting generators. In view of the state of the art in the technology for manufacturing superconductors and their cost, a conclusion is drawn, according to which a synchronous gearless superconducting wind generator with a capacity of 10 MW with the field winding made of a high-temperature superconducting material (MgB2, Bi-2223 or YBCO) with the «ferromagnetic stator — ferromagnetic rotor» topology, with the stator diameter equal to 7—9 m, and with the number of poles equal to 32—40 has prospects for its practical use in the nearest future.

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