| Autor: |
Fesmire, J. E., Augustynowicz, S. D., Heckle, K. W., Scholtens, B. E. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2004, Vol. 710 Issue 1, p579-586, 8p |
| Abstrakt: |
The study and evaluation of cryogenic thermal insulation materials and systems is a technology focus area of the Cryogenics Testbed at NASA Kennedy Space Center. The liquid nitrogen evaporation method is used between boundary temperatures of about 300 kelvin (K) and 77 K to make accurate measurements of the heat transfer rates and apparent thermal conductivity values (k-values) through different insulation systems. The methods include thermal performance characterization over the full range of pressures from high vacuum to no vacuum. Innovations include the design and development of three types of research test cryostats. The novel cryostats include absolute k-value for cylindrical specimens, comparative k-value for cylindrical specimens, and comparative k-value for flat specimens (including compressive loading). The material specimens may be in forms such as bulk fill, flat panel, multilayer, or continuously rolled. These new test methods are shown to be complementary to other established test methods. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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