The feasibility and application of multi–layer vacuum insulation for cryogenic hydrogen storage / Hodgman J.H.

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dc.contributor.author Hodgman, Jacobus Henry en_US
dc.date.accessioned 2012-09-10T16:21:11Z
dc.date.available 2012-09-10T16:21:11Z
dc.date.issued 2011 en_US
dc.identifier.uri http://hdl.handle.net/10394/7327
dc.description Thesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2012.
dc.description.abstract A need was identified to test multi–layer vacuum super insulation (MLVSI) used in cryogenic applications for hydrogen storage. The study focuses on the application of commercially available MLVSI to a locally patented liquid hydrogen cryogenic storage system. This led to an investigation of different types of multi–layer vacuum insulation configurations, as well as further research on tank inlet coupling configurations. It includes the manufacturing of a liquid nitrogen testing cryostat to be able to test and evaluate the system performance. The first set of tests was based on the development of an inlet coupling configuration to limit heat transfer through the inner tank inlet, of a double cryogenic tank system in order to reduce gas boil–off. The couplings were manufactured in the form of a bellow to handle cryogenic vacuum levels, while ensuring low heat transfer rates between inner and outer tanks. It was found that various coupling designs can be considered to limit gas boil–off. The second set of tests was conducted on a specific MLVSI configuration to determine its effectiveness to insulate the spherical header surface of a typical hydrogen storage vessel. The installation procedure, to limit heat transfer and boil–off due to edge effects in this configuration was investigated. It was found that insulation–overlap–edge effects will always have an impact on insulation performance when a spherical header of a storage vessel is insulated, due to its specific geometry. A time efficient way to install MLVSI on such a spherical header is presented and evaluated. Further investigations were carried out by combining findings into one single system to determine the performance of an optimised insulated cryogenic system. It was found that copper plate discs installed between the vanes of a bellowed inlet/outlet nozzle is the most promising to limit heat transfer to the cryogenic fluid. en_US
dc.publisher North-West University
dc.subject Multi-layer en_US
dc.subject Vacuum insulation en_US
dc.subject Super insulation en_US
dc.subject Cryogenic en_US
dc.subject Hydrogen storage en_US
dc.title The feasibility and application of multi–layer vacuum insulation for cryogenic hydrogen storage / Hodgman J.H. en_US
dc.type Thesis en_US
dc.description.thesistype Masters en_US

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    This collection contains the original digitized versions of research conducted at the North-West University (Potchefstroom Campus)

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