21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

C1Or2A-02: Numerical study of a consequence of a vacuum insulation degradation in a cryogenic system

22 Jul 2019, 16:15
15m
Level 6, Room 26-27

Level 6, Room 26-27

Speaker

Ziemowit Malecha (Wroclaw University of Technology)

Description

Vacuum is the primary method for a thermal insulation of cold elements in cryogenic systems, tanks and other cryogenic equipment. A dangerous situation arise in the case of vacuum envelope failure when a 300 K air enters the vacuum and the cold elements of cryogenics equipment are exposed to a potentially intense heat fluxes and air velocity. Depending on a mass flow of the air (equivalent to size of an insulation rapture), a different rate of the temperature and pressure growth in the vacuum chamber can promote various mechanisms of the heat transfer to the cold elements. Additionally, it can be limited by the air condensation and cryosorption. In the present work a simplified numerical model of a typical cryogenics system is developed and different scenarios of vacuum degradation are considered. The current studies aim to identify the development of the different thermal conditions in the cryogenics system in the function of the mass flow of the ventilating air.

Primary authors

Ziemowit Malecha (Wroclaw University of Technology) Jaroslaw Polinski (Wroclaw University of Technology) Mr Aleksander Kopczynski (Wroclaw University of Science and Technology) Mr Blazej Baran (Wroclaw University of Science and Technology)

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