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Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum

Weber, C. 1; Henriques, A.; Schirle, S. 1; Grohmann, S. ORCID iD icon 1
1 Institut für Technische Physik (ITEP), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The dimensioning of pressure relief devices (PRD) for cryogenic pressure equipment requires knowledge on the heat input at the maximum credible incident. In helium cryostats, this situation is typically defined by the loss of insulating vacuum (LIV), where the heat load is induced by desublimation and condensation of atmospheric air on the cryogenic surface. This surface is often covered with multi-layer insulation (MLI) in order to reduce the thermal radiation heat load in standard operation. During loss of insulating vacuum, the MLI represents a diffusive barrier for the air to reach the cryogenic surface, reducing the heat flux as well. Experimental reference data for the heat flux in case of LIV exist mainly for blank surfaces; only few data are published for MLI-covered helium surfaces. Therefore, the effect has been investigated in the cryogenic safety test facility PICARD at KIT. This paper presents the results of venting experiments carried out with different numbers of layers and different types of MLI.

Verlagsausgabe §
DOI: 10.5445/IR/1000121282
Veröffentlicht am 15.07.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Institut für Technische Thermodynamik und Kältetechnik (TTK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1757-899X
KITopen-ID: 1000121282
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in IOP conference series / Materials science and engineering
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 755
Seiten 012155
Bemerkung zur Veröffentlichung Advances in Cryogenic Engineering: Proceedings of the Cryogenic Engineering Conference (CEC) 2019, 21-25 July 2019, Hartford, Connecticut, USA
Vorab online veröffentlicht am 30.06.2020
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