Quantifying MLI Thermal Conduction in Cryogenic Applications from Experimental Data

Cryogenic Engineering Conference 2015

材料科学;物理学

Ross, R.G.^1

Jet Propulsion Laboratory, California Institute of Technology, Pasadena

CA

91109, United States^1

关键词: Cryogenic applications;    Cryogenic temperatures;    Heat transfer data;    Multi-layer insulation;    Nonlinear heat transfer;    Quantitative data;    Temperature decrease;    Thermal conduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012017/pdf
DOI  :  10.1088/1757-899X/101/1/012017

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Multilayer Insulation (MLI) uses stacks of low-emittance metalized sheets combined with low-conduction spacer features to greatly reduce the heat transfer to cryogenic applications from higher temperature surrounds. However, as the hot-side temperature decreases from room temperature to cryogenic temperatures, the level of radiant heat transfer drops as the fourth power of the temperature, while the heat transfer by conduction only falls off linearly. This results in cryogenic MLI being dominated by conduction, a quantity that is extremely sensitive to MLI blanket construction and very poorly quantified in the literature. To develop useful quantitative data on cryogenic blanket conduction, multilayer nonlinear heat transfer models are used to analyze extensive heat transfer data measured by Lockheed Palo Alto on their cryogenic dewar MLI and measured by JPL on their spacecraft MLI. The data-fitting aspect of the modeling allows the radiative and conductive thermal properties of the tested blankets to be explicitly quantified. Results are presented showing that MLI conductance varies by a factor of 600 between spacecraft MLI and Lockheed's best cryogenic MLI.