JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

このアイテムに関連するファイルはありません。

タイトルAffect of Air Leakage into a Thermal-Vacuum Chamber on Helium Refrigeration Heat Load
著者(英)Lauterbach, John; Linza, Robert; Saheli, Fariborz; Ganni, Venkatarao (Rao); Garcia, Sam; Reis, Carl; Vargas, Gerardo; Meagher, Daniel; Homan, Jonathan
著者所属(英)Jacobs Engineering Group, Inc.
発行日2008-09-22
言語eng
内容記述NASA s Johnson Space Center (JSC) Building 32 houses two large thermal-vacuum chambers (Chamber A and Chamber B). Within these chambers are liquid nitrogen shrouds to provide a thermal environment and helium panels which operate at 20K to provide cryopumping. Some amount of air leakage into the chambers during tests is inevitable. This causes "air fouling" of the helium panel surfaces due to the components of the air that adhere to the panels. The air fouling causes the emittance of the helium panels to increase during tests. The increase in helium panel emittance increases the heat load on the helium refrigerator that supplies the 20K helium for those panels. Planning for thermal-vacuum tests should account for this increase to make sure that the helium refrigerator capacity will not be exceeded over the duration of a test. During a recent test conducted in Chamber B a known-size air leak was introduced to the chamber. Emittance change of the helium panels and the affect on the helium refrigerator was characterized. A description of the test and the results will be presented.
NASA分類Engineering (General)
権利Copyright, Distribution as joint owner in the copyright


このリポジトリに保管されているアイテムは、他に指定されている場合を除き、著作権により保護されています。