CFD simulations on small hydrogen releases inside a ventilated facility and assessment of ventilation efficiency

Papanikolaou, E; Venetsanos, AG; Cerchiara, GM; Carcassi, M; Markatos, N

dc.contributor.author	Papanikolaou, E	en
dc.contributor.author	Venetsanos, AG	en
dc.contributor.author	Cerchiara, GM	en
dc.contributor.author	Carcassi, M	en
dc.contributor.author	Markatos, N	en
dc.date.accessioned	2014-03-01T01:35:23Z
dc.date.available	2014-03-01T01:35:23Z
dc.date.issued	2011	en
dc.identifier.issn	0360-3199	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21027
dc.subject	ATEX	en
dc.subject	CFD	en
dc.subject	Enclosure	en
dc.subject	Experiments	en
dc.subject	Fuel cell	en
dc.subject	Hydrogen	en
dc.subject	Ventilation assessment	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	Accumulation effects	en
dc.subject.other	ADREA-HF	en
dc.subject.other	ATEX	en
dc.subject.other	CFD	en
dc.subject.other	CFD simulations	en
dc.subject.other	European directive	en
dc.subject.other	Fuel cell system	en
dc.subject.other	Hydrogen release	en
dc.subject.other	Natural ventilation	en
dc.subject.other	New technologies	en
dc.subject.other	Safety assessments	en
dc.subject.other	Sensor location	en
dc.subject.other	Technical guidelines	en
dc.subject.other	Ventilation efficiency	en
dc.subject.other	Ventilation systems	en
dc.subject.other	Enclosures	en
dc.subject.other	Experiments	en
dc.subject.other	Fuel systems	en
dc.subject.other	Hydrogen	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Pressure regulators	en
dc.subject.other	Rating	en
dc.subject.other	Ventilation	en
dc.subject.other	Fuel cells	en
dc.title	CFD simulations on small hydrogen releases inside a ventilated facility and assessment of ventilation efficiency	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijhydene.2010.04.119	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijhydene.2010.04.119	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The use of stationary H-2 and fuel cell systems is expected to increase rapidly in the future. In order to facilitate the safe introduction of this new technology, the HyPer project, funded by the EC, developed a public harmonized Installation Permitting Guidance (IPG) document for the installation of small stationary H-2 and fuel cell systems for use in various environments. The present contribution focuses on the safety assessment of a facility, inside which a small H-2 fuel cell system (4.8 kW(e)) is installed and operated. Dispersion experiments were designed and performed by partner UNIPI. The scenarios considered cover releases occurring inside the fuel cell at the valve of the inlet gas pipeline just before the pressure regulator, which controls the H-2 flow to the fuel cell system. H-2 was expected to leak out of the fuel cell into the facility and then outdoors through the ventilation system. The initial leakage diameter was chosen based on the Italian technical guidelines for the enforcement of the ATEX European directive. Several natural ventilation configurations were examined. The performed tests were simulated by NCSRD using the ADREA-HF code. The numerical analysis took into account the full interior of the fuel cell, in order to investigate for any potential accumulation effects. Comparisons between predicted and experimental H-2 concentrations at 4 sensor locations inside the facility are reported. Finally, an overall assessment of the ventilation efficiency was made based on the simulations and experiments. (c) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Hydrogen Energy	en
dc.identifier.doi	10.1016/j.ijhydene.2010.04.119	en
dc.identifier.isi	ISI:000288825800087	en
dc.identifier.volume	36	en
dc.identifier.issue	3	en
dc.identifier.spage	2597	en
dc.identifier.epage	2605	en