Mazzucco, Andrea

For at skabe en solid base for et markedsgennembrud af brændselscellebiler er der stadigvæk en del udfordringer der skal overkommes. Udviklingen af en tank der effektivt kan lagre brinten i køretøjet er en af de primære tekniske udfordringer som skal løses.Denne afhandling beskæftiger sig med udviklingen af et simuleringsværktøj der kan bruges til at sammenligne forskellige brintlagringsteknologier indenfor målene for lagring- og fyldningseffektivitet. De fastsatte mål repræsenterer forbedring i ydelse i forhold til den nyeste teknologi og de er forskelligt defineret for hver lagringsteknologi.Fokus er lagt på løsninger der indebærer brint lagret som højtryksgas og brintbundet i fast stof, begge med et passivt kølesystem. I simuleringsværktøjet er der implementeret flere biblioteker der gør det muligt at vælge materiale sammensætning,varmeveksler konfiguration og design af analysen efter brugerens behov.Pålidelige beregningsmodeller er udviklet for at beskrive absorptive og desorptive reaktioner samt smeltning- og størkningsprocesserne der forekommer i metalhydridtanke samt i højtryks brint tanke. Disse modeller er benyttet til at kvantificere det primære design, metalhydridens tykkelse i forhold til tanken og varmeveksler systemet.For tanken indeholdende metalhydrider kan det rørformede layout i en ”shell andtube” konfiguration med 2 mm indvendig diameter af rørende opnå den ønskedepåfyldningstid på 3 min mens den maksimalt kan lagre 3.1 kg i en 126 L tank. Desorptionen af denne løsning har vist sig at kunne modstå krævende afladningsforhold.For tanke indeholdende brint ved højttryk er et nyt design med 5-mmfaseskiftendemateriale i tankvæggen til passiv køling af brinten foreslået. Derved opnår tanken samme mængde lagret gas som ved andre typer tanke og påfyldningstiden er inden for standarden. Ved at bruge et faseskiftende materiale i væggen kan for-kølingen af brinten der normalt foregår på selve tankstationen elimineres. Derved spares 4.2MJper påfyldning mod tankene der bruges i dag.Many challenges have still to be overcome in order to establish a solid ground for significant market penetration of fuel cell hydrogen vehicles. The development of an effective solution for on-board hydrogen storage is one of the main technical tasks that need to be tackled.The present thesis deals with the development of a simulation tool to design and compare different vehicular storage options with respect to targets based upon storage and fueling efficiencies. The set targets represent performance improvements with regard to the state-of-the-art technology and are separately defined for each storage solution investigated in this work. Attention is given to solutions that involve high-pressure solid-state and gas hydrogen storage with an integrated passive cooling system. A set of libraries is implemented in the modeling platform to select among different material compositions, kinetic equations, heat exchanger configurations and to enable the tailoring of the analysis according to the user needs. Reliable computational models are developed to describe hydriding and dehydriding reactions as well as melting and solidification processes that occur in the metal hydride tank and novel compressed-hydrogen vessel respectively. For the former, these models are used to quantify the main design parameter, being the critical metal hydride thickness, for the tank/heat-exchanger system. For the metal hydride tank, the tubular layout in a shell and tube configuration with 2 mm inner diameter tubes is found to achieve the desired refueling time of 3 min and store a maximum of 3.1 kg of hydrogen in a 126 L tank. The dehydriding ability of this solution is proven to withstand intense discharging conditions. For the hydrogen gas tank, a novel design that includes a phase change material in its inner volume. Heat transfer augmentation techniques (e.g. encapsulation) are found to be the reward strategy to achieve the same stored mass and fueling time of the standard technology, while enabling ambient temperature fueling and save the energy cooling demand (4.2 MJ per fueling) at the refueling station

Online Research Database In Technology

Tank designs for combined high pressure gas and solid state hydrogen storage - DTU Orbit(09/11/2017) Tank designs for combined high pressure gas and solid state hydrogen storageMany challenges have still to be overcome in order to establish a solid ground for significant market penetration of fuel cellhydrogen vehicles. The development of an effective solution for on-board hydrogen storage is one of the main technicaltasks that need to be tackled.  The present thesis deals with the development of a simulation tool to design and compare different vehicular storageoptions with respect to targets based upon storage and fueling efficiencies. The set targets represent performanceimprovements with regard to the state-of-the-art technology and are separately defined for each storage solutioninvestigated in this work. Attention is given to solutions that involve high-pressure solid-state and gas hydrogen storagewith an integrated passive cooling system. A set of libraries is implemented in the modeling platform to select amongdifferent material compositions, kinetic equations, heat exchanger configurations and to enable the tailoring of the analysisaccording to the user needs.   Reliable computational models are developed to describe hydriding and dehydriding reactions as well as melting andsolidification processes that occur in the metal hydride tank and novel compressed-hydrogen vessel respectively. For theformer, these models are used to quantify the main design parameter, being the critical metal hydride thickness, for thetank/heat-exchanger system.   For the metal hydride tank, the tubular layout in a shell and tube configuration with 2 mm inner diameter tubes is found toachieve the desired refueling time of 3 min and store a maximum of 3.1 kg of hydrogen in a 126 L tank. The dehydridingability of this solution is proven to withstand intense discharging conditions.   For the hydrogen gas tank, a novel design that includes a phase change material in its inner volume. Heat transferaugmentation techniques (e.g. encapsulation) are found to be the reward strategy to achieve the same stored mass andfueling time of the standard technology, while enabling ambient temperature fueling and save the energy cooling demand(4.2 MJ per fueling) at the refueling station. General informationState: PublishedOrganisations: Department of Mechanical Engineering, Thermal EnergyAuthors: Mazzucco, A. (Intern), Rokni, M. (Intern), Elmegaard, B. (Intern)Number of pages: 193Publication date: 2016 Publication informationPlace of publication: Kgs. LyngbyPublisher: Technical University of Denmark (DTU)ISBN (Electronic): 978-87-7475-443-5Original language: English Series: DCAMM Special ReportNumber: S197ISSN: 0903-1685Main Research Area: Technical/natural sciencesElectronic versions: S197_Andrea_Mazzucco_PhD_Thesis.pdf  RelationsProjects: Tank designs for combined high pressure gas and solid state hydrogen storage Publication: Research › Ph.D. thesis – Annual report year: 2016 

Tank designs for combined high pressure gas and solid state hydrogen storage

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Tank designs for combined high pressure gas and solid state hydrogen storage

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