Numerical Study of Solid State Hydrogen Storage System with Finned Tube Heat Exchanger
TL;DR: In this paper, a metal hydride (MH)-based hydrogen storage system generates significant amount of heat and this heat must be removed rapidly to improve the performance of the syst...
Abstract: Absorption of hydrogen gas inside the metal hydride (MH)-based hydrogen storage system generates significant amount of heat. This heat must be removed rapidly to improve the performance of the syst...
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TL;DR: In this article, the authors comprehensively review thermal management solutions for the metal hydride (MH) hydrogen storage used in fuel cell systems by also focusing on heat transfer enhancement techniques and assessment of heat sources used for this purpose.
73 citations
TL;DR: In this paper , the authors developed a metal hydrides (MH) based hydrogen storage using a triply periodic minimal surface (TPMS) structure and a mathematical model was developed to analyze and improve its performance in terms of hydrogen absorption and desorption rates.
11 citations
TL;DR: In this paper , two bio-inspired leaf-veinvein type fin configurations for the metal hydride reactor were proposed for heat transfer fluid flow, namely (i) central straight tube and (ii) narrow trapezoidal channels with 10 kg of LaNi5 as a sample alloy.
9 citations
TL;DR: In this article, a two-dimensional mathematical model was established to evaluate the thermofluidynamic behavior of a newly developed double-layered cylindrical ZrCo-based hydride bed during the hydrogenation reaction process.
Abstract: This work established a two-dimensional mathematical model to evaluate the thermofluidynamic behavior of a newly developed double-layered cylindrical ZrCo-based hydride bed during the hydrogenation reaction process. Numerical simulations by using COMSOL Multiphysics were conducted to solve the governing partial differential equations associated with chemical reaction and thermal transfer. Importantly, the local thermal nonequilibrium theory was applied to analyze the heat transfer between the ZrCo particle and hydrogen. Detailed analysis revealed the effects of operating conditions, material thermophysical properties, and the bed configuration, in addition to the ZrCo hydride particle sizes on hydrogen recovery characteristics. The simulation results indicated that increasing the heat transfer coefficient, reducing the coolant temperature, improving the thermal conductivity of the metal hydride, using the thinner hydride layer, and being equipped with copper fins were more beneficial to accelerate the heat transfer rate and the hydrogen charging rate of the metal hydride bed (MHB). Furthermore, along the radial direction, tremendous temperature gradient and distribution of absorbed hydrogen were found in the hydrogenated zones. The present model can effectively characterize the reaction kinetic mechanisms of ZrCo hydriding process as to further promote the practical application of the proposed MHB designs.
7 citations
TL;DR: In this paper , the metal hydride Reactor (MHR) is the core device used in achieving the desired stable and comprehensive performance of a hydrogen storage system, and the initial outline of the MHR was sketched reasonably by comparing and referring to wide outstanding findings.
Abstract: Hydrogen storage is now the “bottleneck” to realise the application of hydrogen as renewable energy. This is because most metals can reversibly absorb hydrogen. Undoubtedly, a metal hydride reactor (MHR) is the core device used in achieving the desired stable and comprehensive performance of a hydrogen storage system. This study made significant efforts to outline a design methodology and acquired an optimised large-scale MHR (> 50 kg-MHs) for various applications. It mapped and analysed the MHR research progress in the past 20 years with the aid of CiteSpace, and formed a brief scientometric review from the start. Second, the priority in various applications was concluded in a few keywords to provide assistance to priorities adopted. By means of pre-set MH categories, sketch configurations, and the input/output path of the reaction heat and filling mode, the initial outline of the MHR was sketched reasonably by comparing and referring to wide outstanding findings. The following optimisation procedure would give designers/investigators a deep understanding of complex and multidisciplinary MHR wherein absorption and desorption, and the resultant heat and mass transport, pulverisation, self-densification, and stress characteristics were tightly coupled. Subsequently, anticipative results were obtained by designing and simulating the capacity, system gravimetric capacity, system volumetric capacity, and other core dynamic indices. This paper provides a unified design policy based on excellent reported results which could serve as a roadmap for the design of practical large-scale MHRs and is expected to be satisfied with different application scenarios.
5 citations
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TL;DR: In this paper, a numerical model for transient heat and mass transfer within metal hydride reaction beds is presented, and theoretical predictions based on this model are compared with experimentally determined reaction rates and pressure-temperature distributions within the reaction beds.
Abstract: A numerical model for transient heat and mass transfer within metal hydride reaction beds is presented. Theoretical predictions based on this model are compared with experimentally determined reaction rates and pressure-temperature distributions within the reaction beds. In addition, a mathematical treatment of the behaviour of coupled reaction beds is shown and as an example calculated hydrogen pressures are compared with experimental results.
199 citations
"Numerical Study of Solid State Hydr..." refers background in this paper
...Hydrogen mass charged and discharged by the MH per unit time and volume are written as _ ma and _ md respectively, and can be given as follows [20]:...
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...[20] proposed a mathematical model for describing coupled heat and mass transfer phenomenon inside the MH beds....
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TL;DR: In this paper, metal hydride-based hydrogen storage devices are tested using AB5 alloys, namely MmNi4.6Fe0.4 and MmAl0.6Al 0.4.
145 citations
Additional excerpts
...[18] selected two different MHs, namely MmNi4....
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TL;DR: In this paper, a two-dimensional mathematical model to optimized heat and mass transfer in metal hydride storage tanks (hereinafter MHSTs) for fuel cell vehicles, equipped with finned spiral tube heat exchangers is presented.
129 citations
TL;DR: In this article, the simulation of a metal hydride-based hydrogen storage device with LaNi 5 as the hydriding alloy is presented, and a study of the geometric and operating parameters has been carried out to identify their influence on the performance of the storage device.
116 citations
"Numerical Study of Solid State Hydr..." refers background in this paper
...Equilibrium pressure can be expressed by van’t Hoff relationship [14]:...
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...[14] modeled a LaNi5-based storage system consisting of number of filters for diffusing the hydrogen gas and heat exchanger tubes for cooling and heating of bed during charging and discharging processes of hydrogen, respectively....
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TL;DR: In this paper, the representative achievements with regards to the design issues so far were reviewed in detail, and some comments were made accordingly, concluding that an optimized reactor design comes from integrated considerations of numerous factors, particularly requirements for the applications and characteristics of the metal hydride system.
111 citations