Numerical study on natural convection of liquid nitrogen used to cool the high-temperature superconducting cable in a new combined energy transmission system

Cryogenics ◽  
2020 ◽  
Vol 109 ◽  
pp. 103101
Author(s):  
Chengfeng Zhu ◽  
Yanzhong Li ◽  
Hongbo Tan
Keyword(s):  
High Temperature ◽  
Natural Convection ◽  
Liquid Nitrogen ◽  
Numerical Study ◽  
Transmission System ◽  
Energy Transmission ◽  
High Temperature Superconducting

Two Application Issues of High Temperature Superconducting Maglev in the Evacuated Tube Transportation

2011 ◽  
Vol 71-78 ◽  
pp. 4389-4393 ◽  
Author(s):  
Yao Ping Zhang ◽  
Jian Yue Yu ◽  
Yong Zhao ◽  
Ben Lin Liu
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
High Reliability ◽  
Relief Valve ◽  
High Temperature Superconducting ◽  
Energy Consuming ◽  
Evacuated Tube Transportation ◽  
Evacuated Tube ◽  
High Temperature Superconducting Maglev ◽  
Stability Energy

Based on some special merits such as self-stability, energy-consuming-efficiency, less pollution, high reliability, and so on, high temperature superconducting maglev (HTSM) is one of the promising potential technologies among present Maglev technologies for the future evacuated tube transportation (ETT). In this paper, the possibility, the merits, and the demerits of the applications of HTSM in ETT system are investigated. Especially, two application issues, liquid nitrogen vessel on the vehicle and isolated gate set in ETT, are discussed and solutions are suggested. On the first issue, this paper suggests to install a pressure relief valve on the sealed liquid nitrogen vessel so as to reduce the liquid nitrogen vaporization in the vacuum tube. As for the second issue, this paper recommends to use HTSM permanent magnet (PM) track structure with a streamline separated gap between the surface of track and the bottom of liquid nitrogen vessel. Those guideway structure could fit to the isolation gate setting in ETT.

Development of a Superconducting Transformer for Rolling Stock

2006 ◽  
Vol 47 ◽  
pp. 204-211
Author(s):  
Hiroyuki Fujimoto ◽  
Hiroshi Hata ◽  
Hiroki Kamijo ◽  
Ken Nagashima ◽  
Kazuya Ikeda ◽  
...  
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
High Speed ◽  
Rolling Stock ◽  
Maximum Output ◽  
Superconducting Wire ◽  
High Temperature Superconducting ◽  
Highly Efficient ◽  
Liquid Nitrogen Cooling

Having undertaken studies into a lightweight and highly efficient superconducting transformer for rolling stock, we developed a prototype with a primary winding, four secondary windings and a tertiary winding using Bi-2223 high temperature superconducting wire. Its primary voltage is 25kV, which is widely adopted as the catenary voltage on the world's high-speed lines. We adopted liquid nitrogen cooling, the weight being 1.71t excluding the refrigerator. The maximum output available to maintain superconductivity is 3.5MVA. We also introduce railways in Japan.

Numerical Study on Overcurrent Process of High-Temperature Superconducting Coated Conductors

2016 ◽  
Vol 30 (11) ◽  
pp. 3263-3270 ◽  
Author(s):  
J. Sheng ◽  
D. Hu ◽  
K. Ryu ◽  
H. S. Yang ◽  
Z. Y. Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Numerical Study ◽  
Coated Conductors ◽  
High Temperature Superconducting

Impact of Cavity Aspect Ratio on Natural Convection Heat Loss of a Solar Receiver for High-Temperature Dish System

2011 ◽  
Vol 268-270 ◽  
pp. 214-218 ◽  
Author(s):  
Shuang Ying Wu ◽  
Lan Xiao ◽  
You Rong Li
Keyword(s):  
High Temperature ◽  
Natural Convection ◽  
Aspect Ratio ◽  
Heat Loss ◽  
Numerical Study ◽  
Convection Heat ◽  
Property Variation ◽  
Velocity Magnitude ◽  
Shallow Cavity ◽  
Solar Receiver

A 3-D numerical study has been carried out to uncover the influence of cavity aspect ratio on natural convection heat loss of a solar receiver for high-temperature dish system, accounting for air property variation with temperature. Temperature and velocity contours as well as the variation of the natural convection heat loss with the cavity aspect ratio have been well presented and discussed. It is revealed that the expansion of convection zone together with the augmentation of velocity magnitude result in the increment of natural convection heat loss with decreasing aspect ratio, i.e., with shallower cavity, especially when the cavity aspect ratio larger than 1. Therefore, the solar receiver with much too shallow cavity should be avoided in design.

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