Development of a technology for manufacturing a heat-shielding structure on nitrogen cryocontainers, excluding heat transfer through gas
| Autor: | Zhun, H. H., Starikov, V. V., Koverya, V. P. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/10.0013291 |
| Popis: | One of the important stages in the creation of the scientific and technical foundations for the calculation, design and manufacturing technology of the lowest heat-conductivity thermal protection from screen-vacuum thermal insulation (SVTI) is the development of a process for achieving the optimal vacuum in the SVTI layers, since at this pressure, thermal conductivity through the SVTI is carried out only due to the radiant and contact-conductive components. It is proposed to obtain such a pressure in thermal insulation by using cushioning material in it, which was previously degassed in a separate vacuum chamber at 370-380 K for 12 hours in order to remove water molecules from its structure and then replace them with dry nitrogen molecules. These molecules have 3-4 times less heat of adsorption; therefore they are pumped out faster. As a result, it becomes possible to accelerate (by 20 hours) to achieve optimal vacuum in thermal insulation, as well as 11% lower effective thermal conductivity. The analysis carried out (according to the developed methodology) showed that the achieved optimal effective thermal conductivity of thermal insulation in a cryocontainers is determined by 33% of radiant thermal conductivity and 67% of the contact-conductive component. Comment: 18 pages, 8 figures |
| Databáze: | arXiv |
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