Passive Gas-Gap Heat Switches for use in Low-Temperature Cryogenic Systems

Cryogenic Engineering Conference 2017

材料科学;物理学

Kimball, Mark O.^1 ; Shirron, Peter J.^1 ; Canavan, Edgar R.^1 ; Tuttle, James G.^1 ; Jahromi, Amir E.^1 ; DiPirro, Michael J.^1 ; James, Bryan L.^1 ; Sampson, Michael A.^1 ; Letmate, Richard V.^2

NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt

MD

20771, United States^1

Bastion Technologies, 7515 Mission Drive, Lanham

MD

20706, United States^2

关键词: Cryogenic system;    Gas gaps;    Heat switches;    Low temperatures;    Thermodynamic cycle;    Thermodynamic efficiency;    Threshold temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012010/pdf
DOI  :  10.1088/1757-899X/278/1/012010

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We present the current state of development in passive gas-gap heat switches. This type of switch does not require a separate heater to activate heat transfer but, instead, relies upon the warming of one end due to an intrinsic step in a thermodynamic cycle to raise a getter above a threshold temperature. Above this temperature sequestered gas is released to couple both sides of the switch. This enhances the thermodynamic efficiency of the system and reduces the complexity of the control system. Various gas mixtures and getter configurations will be presented.