๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Thermal isolation of large loads at low temperature using Kevlar rope

โœ Scribed by L. Duband; L. Hui; A. Lange

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
510 KB
Volume
33
Category
Article
ISSN
0011-2275

No coin nor oath required. For personal study only.

โœฆ Synopsis

A mechanical support system is described for a space-borne 3He refrigerator that relies on Kevlar 29 braided cords to achieve thermal isolation at temperatures ranging from 0.3 to 40 K. Measurements of the Young's modulus, tensile strength, creep and thermal conductivity of Kevlar cords at room and liquid nitrogen temperatures are discussed and used to predict the performance of the system. Results of vibration tests of the mechanical support are compared with these predictions. The system safely supports a 350 g mass against 30 G sinusoidal accelerations at frequencies of 20 Hz to 2 kHz. The calculated heat load between 2 and 0.3 K is 0.7/~W.

๐Ÿ“œ SIMILAR VOLUMES

Thermal conductivity of evacuated perlit
Thermal conductivity of evacuated perlite at low temperatures as a function of load and load history
โœ W.P. Dubรฉ; L.L. Sparks; A.J. Slifka ๐Ÿ“‚ Article ๐Ÿ“… 1991 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 434 KB

Perlite, a powdered insulation, is commonly used in large cryogenic storage dewars. When these dewars are thermally cycled, the perlite in the evacuated space between the inner and outer vessels of the dewar experiences a changing mechanical load due to thermal expansion and contraction of the inner