| 摘要 |
<p>Apparatus for providing a simulated space environment for the testing of articles under low temperature conditions comprising a liquid nitrogen head tank (D), liquid nitrogen subcooler pumps (H), a liquid nitrogen subcooler coil (G), a liquid nitrogen head tank makeup pumps (B), a low pressure liquid nitrogen storage tank (A), a high pressure liquid nitrogen storage tank (C), a liquid nitrogen transfer pump, a vacuum chamber (E) and thermal simulation heat exchanger shrouds (CC, F) contained within the vacuum chamber (E). Appropriate internal and external piping connects these components so that the apparatus can be operted both in a subcooled pressurized closed loop system and in a gravity convection system. While liquid nitrogen in this apparatus will produce a stable uniform temperature of -173 DEG C (-279 DEG F) within the shrouds (CC, F) containing the article to be tested, other liquids with similar low temperature characteristics may be used. A requirement for such liquids when used as a circulating medium with the apparatus herein is that the boiling point thereof at one atmosphere will produce the required test operating temperature.</p> |
