Numerical study of heat exchanger effects on charge/discharge times of metal–hydrogen storage vessel

Mellouli, Sofiene; Askri, Faouzi; Dhaou, H.; Jemni, Abdelmajid; Nasrallah, Sassi Ben

doi:10.1016/j.ijhydene.2008.12.099

Cited by 91 publications

(27 citation statements)

References 21 publications

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“…Metal energy heat conduction equation can be obtained from formula (12). Then the inner wall conducts heat to the water cooled inner tube and heat is brought away by water, which can be obtained from formula (13).…”

Section: Metal Tube Wall and Inner Tube Water-cooled Areamentioning

confidence: 99%

“…In 2009 Jemni's numerical simulation results showed that the internal temperature control had better outcomes on hydrogen storage and release reactions than the outer temperature control [12]. In 2010 Ye explained the impact of the external control tank's ratio of the height and radius (H / R) on the saturated hydrogen absorption reaction speed [13].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Minimum Entropy Generation Theorem Investigation and Optimization of Metal Hydride Alloy Hydrogen Storage

Wang¹,

Liu²

2014

Smart Science

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Section: Metal Tube Wall and Inner Tube Water-cooled Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Minimum Entropy Generation Theorem Investigation and Optimization of Metal Hydride Alloy Hydrogen Storage

Wang¹,

Liu²

2014

Smart Science

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“…Most of the methods are developed by adding solid matrices like fins or by compacting metal hydrides [22]. Some of these techniques are: using porous tubes/sheets for instantaneous hydrogen supply along the bed, porous bodies encapsulating the hydride powder, e.g., graphite structures, Porous Metal Hydride (PMH-compacts), metal-coated hydride particles, and the insertion of heat transfer enhancement matrices, e.g., metal screens and bands, metal foams, radial and axial metallic fins, and metallic wire nets [13,[23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The problem which arises by implementing any of these techniques is the increased thermal mass of the system, which affects the overall hydrogen storage capacity of the system.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Magnetic Field on Thermal-Reaction Kinetics of a Paramagnetic Metal Hydride Storage Bed

2017

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Featured Application: The results of this research are applicable to metal hydride hydrogen storage systems and the onboard hydrogen storage system in the automobile industry.Abstract: A safe and efficient method for storing hydrogen is solid state storage through a chemical reaction in metal hydrides. A good amount of research has been conducted on hydrogenation properties of metal hydrides and possible methods to improve them. Background research shows that heat transfer is one of the reaction rate controlling parameters in a metal hydride hydrogen storage system. Considering that some very well-known hydrides like lanthanum nickel (LaNi 5 ) and magnesium hydride (MgH 2 ) are paramagnetic materials, the effect of an external magnetic field on heat conduction and reaction kinetics in a metal hydride storage system with such materials needs to be studied. In the current paper, hydrogenation properties of lanthanum nickel under magnetism were studied. The properties which were under consideration include reaction kinetics, hydrogen absorption capacity, and hydrogenation time. Experimentation has proven the positive effect of applying magnetic fields on the heat conduction, reaction kinetics, and hydrogenation time of a lanthanum nickel bed. However, magnetism did not increase the hydrogenation capacity of lanthanum nickel, which is evidence to prove that elevated hydrogenation characteristics result from enhanced heat transfer in the bed.

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“…Mellouli, et al analyzed three variations of a metal hydride based storage system originally described in [4], using a 2-dimensional (r-z) numerical model they developed [5]. In particular, the model was employed to evaluate various methods of heat exchange for the vessel.…”

Section: Introductionmentioning

confidence: 99%

“…The 2-dimensional equations defining the model were solved using the control volume finite element method. The storage vessel was a cylinder that confined the metal hydride to a cylindrical geometry and was cooled by combinations of: a water SRNL-STI-2011-00424 jacket, a helical cooling tube embedded in the metal hydride with water used as the heat transfer fluid, and natural convection [5]. Mellouli applied the model to the charging phase for a LaNi 5 based system [5] and used the hydrogen loading rate as the criterion for ranking the storage vessel performance.…”

Section: Introductionmentioning

confidence: 99%

Optimization of internal heat exchangers for hydrogen storage tanks utilizing metal hydrides

Garrison

Hardy

Gorbounov³

et al. 2012

International Journal of Hydrogen Energy

116

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Two detailed, unit-cell models, a transverse fin design and a longitudinal fin design, of a combined hydride bed and heat exchanger are developed in COMSOL ® Multiphysics incorporating and accounting for heat transfer and reaction kinetic limitations. MatLab ® scripts for autonomous model generation are developed and incorporated into (1) a grid-based and (2) a systematic optimization routine based on the Nelder-Mead downhill simplex method to determine the geometrical parameters that lead to the optimal structure for each fin design that maximizes the hydrogen stored within the hydride.The optimal designs for both the transverse and longitudinal fin designs point toward closely-spaced, small cooling fluid tubes. Under the hydrogen feed conditions studied (50 bar), a 25 times improvement or better in the hydrogen storage kinetics will be required to simultaneously meet the Department of Energy technical targets for gravimetric capacity and fill time. These models and methodology can be rapidly applied to other hydrogen storage materials, such as other metal hydrides or to cryoadsorbents, in future work.

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Numerical study of heat exchanger effects on charge/discharge times of metal–hydrogen storage vessel

Cited by 91 publications

References 21 publications

Minimum Entropy Generation Theorem Investigation and Optimization of Metal Hydride Alloy Hydrogen Storage

Minimum Entropy Generation Theorem Investigation and Optimization of Metal Hydride Alloy Hydrogen Storage

The Effect of Magnetic Field on Thermal-Reaction Kinetics of a Paramagnetic Metal Hydride Storage Bed

Optimization of internal heat exchangers for hydrogen storage tanks utilizing metal hydrides

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