Numerical calculation and measurement of low temperature thermal conductivity of polyurethane rigid foam

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Shang, J.^1^2 ; Lv, C.^1^2 ; Yang, S.Q.^1^2 ; Wu, J.H.^1^2

State Key Laboratory of Technologies in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Apparent thermal conductivity;    Cold compressors;    Hierarchical model;    Low temperatures;    Numerical calculation;    Operating condition;    Polyurethane rigid foams;    Property measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012073/pdf
DOI  :  10.1088/1757-899X/502/1/012073

来源: IOP

【 摘 要 】

In the structure of cold compressors, polyurethane rigid foams (PURF) are often used as important thermal insulations for large temperature gradient. Heat transfer in PURF occurs by conduction through the solid skeleton and gases trapped in cells as well as radiation. According to the actual structure and operating conditions of helium cold compressors, a heat transfer hierarchical model has been established, which can predict the apparent thermal conductivity of PURF more simply. Meanwhile the thermal conductivity of a sample PURF has been measured in the physical property measurement system from 4.4K to 300K.Published under licence by IOP Publishing Ltd.