Author(s): Shrabani Ghosh and Swapan C Sarkar

Abstract: Heat is transferred across the annular space of a vacuum-insulated cryogenic vessel by radiation from the hot outer jacket to the cold inner vessel and by gaseous conduction through the residual gas within the annular space. Hence to minimize gaseous conduction, the annular space is degassed at an elevated temperature during the evacuation, and a very high vacuum (10 -6Torr) is maintained. The inner vessel is further wrapped with several layers of radiation shields resulting in a Multilayer insulation system which is the most effective thermal insulation for cryogenic storage vessels. The effectiveness of cryogenic insulation of a cryo container is more often judged by the evaporation rate of the cryogen. In this regard, static evaporation losses of liquid nitrogen from a small indigenously built Cryocan Dewar with respect to time by using a continuous weight loss method are presented. The results are encouraging.

DOI: 10.22271/27078043.2023.v4.i2b.49

Pages: 108-110 | Views: 128 | Downloads: 43

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