Optimum Location of Thermal Radiation Shield in Superconducting Rotating Machines

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Saikiran, P.A.^1 ; Rao, V.V.^1

Applied Superconductivity Laboratory, Cryogenic Engineering Centre, Indian Institute of Technology Kharagpur, West Bengal

721302, India^1

关键词: Critical temperatures;    Cryogenic cooling system;    Low temperatures;    Optimum location;    Radiation heat;    Superconducting rotating machines;    Temperature differences;    Torque tubes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012100/pdf
DOI  :  10.1088/1757-899X/171/1/012100

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Superconducting rotating machines have rotor maintained at low temperatures, below the critical temperature of the superconductor. This establishes large temperature difference between the cold rotor and surroundings, resulting in large heat leak into rotor through conduction, convection and radiation. Minimizing this heat leak is essential to reduce the power expense of cryogenic cooling system. A radiation shield is anchored at a suitable location on torque tube to minimize the radiation heat leak into the cold rotor. This paper presents a methodology to determine the optimum location of this anchor-point of radiation shield for a given geometry, which minimizes the total heat leak into cold rotor. The location of radiation shield is found to be depending on emissivity of cold rotor.