Heat and mass transfer in a metal hydrogen reactor equipped with a phase-change heat-exchanger

Mâad, Hatem Ben; Askri, Faouzi; Nasrallah, Sassi Ben

doi:10.1016/j.ijthermalsci.2015.09.003

Cited by 63 publications

(17 citation statements)

References 26 publications

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“…29 -Effect of hydride bed expansion is negligible. 30 Taking into account these approximations, the mass and energy equations can be written as. 31…”

Section: Governing Equations For the Mh Reactormentioning

confidence: 99%

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

Alqahtani

2022

Intl J of Energy Research

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Summary The combination of a metal hydride (MH) with a water pump has gained significant interest recently. However, the efficiency of such a system is low, as it requires a substantial quantity of heat from an external source to initiate the desorption process. Storing the heat generated by the absorption reaction (exothermic reaction) in a phase change material (PCM) and reusing it during the dehydration reaction (endothermic reaction) is a viable method to enhance the pump's efficiency. Thus, in the present study, the mathematical modeling and numerical simulation of a new configuration of a MH pump (MHP) equipped with a latent heat exchanger were investigated. The obtained results showed that using a PCM with MHP, as energy storage material, considerably enhances the performance of the pump. For example, with a heat transfer coefficient of 50 W/m2.K, an MH's thermal conductivity of 5.32 W/m. K, a PCM's thermal conductivity of 3 W/m. K, and pumping head of 25 m, it was noted that using Ba(OH)2‐8H2O with the pump as PCM decreases the pumping time by approximately 59% and allows for 17 times increase in overall efficiency over the case without PCM.

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“…29 -Effect of hydride bed expansion is negligible. 30 Taking into account these approximations, the mass and energy equations can be written as. 31…”

Section: Governing Equations For the Mh Reactormentioning

confidence: 99%

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

Alqahtani

2022

Intl J of Energy Research

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“…A comparison is necessary to identify and understand the effect of f th to the hydrogenation behaviour. Figure 5A presents the hydrogen storage behaviour for all the different cases of f n (50,55,60,65,70) and f th (2, 3, 5, and 8 mm) for the case of h t = 2000 W/m 2 K. Figure 5B presents the storage behaviour when h t = 5000 W/m 2 K.…”

Section: Metal Hydride Thickness Effect On the Hydrogenation Kineticsmentioning

confidence: 99%

“…An alternative way for heat management is the introduction of phase change materials (PCMs) in the metal hydride tank, which are able to store the produced thermal energy during the hydrogenation and release it for the dehydrogenation that is a purely endothermic process. 55 The usage of PCM in a metal hydride reactor when LaNi 5 is used as the working material is described in a transient 2D numerical approach, and the results revealed that the region close to the PCM can complete the absorption on a faster pace as compared with the core of the reactor.…”

Section: Introductionmentioning

confidence: 99%

“…55 The usage of PCM in a metal hydride reactor when LaNi 5 is used as the working material is described in a transient 2D numerical approach, and the results revealed that the region close to the PCM can complete the absorption on a faster pace as compared with the core of the reactor. 55 The usage of PCM in a metal hydride reactor when LaNi 5 is used as the working material is described in a transient 2D numerical approach, and the results revealed that the region close to the PCM can complete the absorption on a faster pace as compared with the core of the reactor.…”

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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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“…Then, they tested the effects of thermal conductivity and latent heat on the performance of the reactor. Ben Mâad et al 30 examined the influence of the PCM physical properties such as the melting temperature, thermal conductivity, and melting enthalpy on the system performance. They concluded that the hydriding process improves by increasing the melting enthalpy and the PCM thermal conductivity and by reducing the melting temperature while respecting the storage capacity.…”

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confidence: 99%

Parametric study of a metal hydride reactor with phase change materials and heat pipes

Bouzgarrou

Mellouli

Alqahtani

et al. 2021

Intl J of Energy Research

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Heat and mass transfer in a metal hydrogen reactor equipped with a phase-change heat-exchanger

Cited by 63 publications

References 26 publications

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

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

Parametric study of a metal hydride reactor with phase change materials and heat pipes

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Heat and mass transfer in a metal hydrogen reactor equipped with a phase-change heat-exchanger

Cited by 63 publications

References 26 publications

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

Enhancement of the metal hydride hydraulic pump efficiency by integrating a phase change material

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

Parametric study of a metal hydride reactor with phase change materials and heat pipes

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Product

Resources

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