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

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 a...

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Detalles Bibliográficos
Autores principales: Weber, C, Henriques, A, Schirle, S, Grohmann, S
Lenguaje:eng
Publicado: 2020
Acceso en línea:https://dx.doi.org/10.1088/1757-899X/755/1/012155
http://cds.cern.ch/record/2730006
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author Weber, C
Henriques, A
Schirle, S
Grohmann, S
author_facet Weber, C
Henriques, A
Schirle, S
Grohmann, S
author_sort Weber, C
collection CERN
description 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.
id oai-inspirehep.net-1808236
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
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spelling oai-inspirehep.net-18082362020-09-09T21:03:14Zdoi:10.1088/1757-899X/755/1/012155http://cds.cern.ch/record/2730006engWeber, CHenriques, ASchirle, SGrohmann, SMeasurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuumThe 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.oai:inspirehep.net:18082362020
spellingShingle Weber, C
Henriques, A
Schirle, S
Grohmann, S
Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title_full Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title_fullStr Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title_full_unstemmed Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title_short Measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
title_sort measurement of heat flux in multi-layer insulated helium cryostats after loss of insulating vacuum
url https://dx.doi.org/10.1088/1757-899X/755/1/012155
http://cds.cern.ch/record/2730006
work_keys_str_mv AT weberc measurementofheatfluxinmultilayerinsulatedheliumcryostatsafterlossofinsulatingvacuum
AT henriquesa measurementofheatfluxinmultilayerinsulatedheliumcryostatsafterlossofinsulatingvacuum
AT schirles measurementofheatfluxinmultilayerinsulatedheliumcryostatsafterlossofinsulatingvacuum
AT grohmanns measurementofheatfluxinmultilayerinsulatedheliumcryostatsafterlossofinsulatingvacuum