An optimization study on the finned tube heat exchanger used in hydride hydrogen storage system – analytical method and numerical simulation

Nyamsi, Serge Nyallang; Yang, Fusheng; Zhang, Zaoxiao

doi:10.1016/j.ijhydene.2012.08.074

Cited by 97 publications

(21 citation statements)

References 32 publications

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“…A semi-analytical expression of the heat transfer rate from a single fin has been introduced and presented. 63 The effects of the fin geometry, mainly the fin thickness and the radius on the hydrogenation process, were identified. A very interesting outcome was that for the same fin volume, the increase of the fin radius and the decrease on the fin thickness could decrease the thermal resistance of the whole heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

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Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

Gkanas

2019

Int J Energy Res

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Summary In the present study, a numerical approach regarding the thermal management of an Mm‐based AB5‐intermetallic (MmNi4.6Al0.4) for the hydrogenation process is introduced and analysed. Several heat management scenarios are studied. The numerical model was supported and validated with experimental data in terms of hydrogenation capacity and temperature distribution. The numerical analysis is based on the introduction of the energy, mass, and momentum conservation equations to numerically describe the hydrogenation reaction. The main aim of the present study is the numerical description of the heat management when 200 g of hydrogen are stored (13 kg of the hydride). The heat management cases consider the usage of cooling tubes in combination with high thermal conductivity fins. In general, various parameters affect the efficiency of the heat management. The parameters considered are the fin thickness, the fin number—which is directly connected to the metal hydride thickness convective heat transfer coefficient. A nondimensional parameter (nondimensional conductance [NDC]) specially modified to describe the role of the fins in addition to the cooling tubes is introduced to evaluate the heat management. The target of the study was to reduce the hydrogenation time of almost 13 kg of MmNi4.6Al0.4, and from the parametric study, it has been found that the more efficient conditions are fin thickness between 5 and 8 mm and the convective heat transfer coefficient of 2000 W/m2 K.

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Section: Introductionmentioning

confidence: 99%

“…63 The effects of the fin geometry, mainly the fin thickness and the radius on the hydrogenation process, were identified. 63 The effects of the fin geometry, mainly the fin thickness and the radius on the hydrogenation process, were identified.…”

mentioning

confidence: 99%

Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

Gkanas

2019

Int J Energy Res

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“…The influences of operating parameters were investigated by numerical simulation . Nyamsi et al optimized a tube‐fin heat exchanger with annular fins in a LaNi 5 hydrogen storage reactor by both analytical method and numerical simulation, and found slender fins better than stubby fins on reduction of thermal resistance . Bhouri et al assembled 7 tubular reactors with a tube‐fin heat exchanger into a shell.…”

Section: Introductionmentioning

confidence: 99%

“…31 Nyamsi et al optimized a tube-fin heat exchanger with annular fins in a LaNi 5 hydrogen storage reactor by both analytical method and numerical simulation, and found slender fins better than stubby fins on reduction of thermal resistance. 32 Bhouri et al assembled 7 tubular reactors with a tube-fin heat exchanger into a shell. To investigate the influence of operating parameters and fin radial length, analytical and numerical models were established.…”

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confidence: 99%

A novel multilayer fin structure for heat transfer enhancement in hydride-based hydrogen storage reactor

Zhang

Yang

Zhou³

et al. 2018

Int J Energy Res

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Summary Metal hydrides are promising means for compact hydrogen storage. However, the poor heat transfer in the tank packed with metal hydride powders often hinders the system from charging or discharging hydrogen effectively. In this investigation, a tube‐fin heat exchanger is supposed to be inserted to the tank, and an optimization problem accounting for both heat transfer enhancement and cost is formulated. We solve the problem with approximate analytical methods, and the influences of fin geometry are discussed. The comparison results support using quadratic curve‐shaped fins, whose effectiveness is also proved by the numerical simulation results. Furthermore, a novel multilayer fin structure with varying width is proposed, and the key parameters of it are discussed, including the number and the arrangement of fins. This paper is expected to provide new insights for the heat transfer enhancement design of hydride‐based hydrogen storage system.

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“…The proposal to implement transportable energy storage technologies such as the metal hydride reactor with rapid hydrogen absorption is a very lucrative pursuit. Effective energy-storage methods offer the capability of increasing the energy storage periods up to more than one week in many cases, with even longer-term storage solutions available, specifically when using metal hydride reactor systems to increase the level of efficiency when using hydrogen as a fuel source [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Internal Cooling Fins for Metal Hydride Reactors

Kukkapalli

Kim

2016

Energies

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Metal hydride alloys are considered as a promising alternative to conventional hydrogen storage cylinders and mechanical hydrogen compressors. Compared to storing in a classic gas tank, metal hydride alloys can store hydrogen at nearly room pressure and use less volume to store the same amount of hydrogen. However, this hydrogen storage method necessitates an effective way to reject the heat released from the exothermic hydriding reaction. In this paper, a finned conductive insert is adopted to improve the heat transfer in the cylindrical reactor. The fins collect the heat that is volumetrically generated in LaNi 5 metal hydride alloys and deliver it to the channel located in the center, through which a refrigerant flows. A multiple-physics modeling is performed to analyze the transient heat and mass transfer during the hydrogen absorption process. Fin design is made to identify the optimum shape of the finned insert for the best heat rejection. For the shape optimization, use of a predefined transient heat generation function is proposed. Simulations show that there exists an optimal length for the fin geometry.

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An optimization study on the finned tube heat exchanger used in hydride hydrogen storage system – analytical method and numerical simulation

Cited by 97 publications

References 32 publications

Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

A novel multilayer fin structure for heat transfer enhancement in hydride-based hydrogen storage reactor

Optimization of Internal Cooling Fins for Metal Hydride Reactors

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An optimization study on the finned tube heat exchanger used in hydride hydrogen storage system – analytical method and numerical simulation

Cited by 97 publications

References 32 publications

Study on the hydrogenation of an Mm‐based AB 5 ‐intermetallic for sustainable building applications

Study on the hydrogenation of an Mm‐based AB 5 ‐intermetallic for sustainable building applications

A novel multilayer fin structure for heat transfer enhancement in hydride-based hydrogen storage reactor

Optimization of Internal Cooling Fins for Metal Hydride Reactors

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Product

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Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications

Study on the hydrogenation of an Mm‐based AB ₅ ‐intermetallic for sustainable building applications