Absorption and desorption of hydrogen in long metal hydride tank equipped with phase change material jacket

Darzi, A. Ali Rabienataj; Afrouzi, Hamid Hassanzadeh; Moshfegh, Abouzar; Farhadi, Mousa

doi:10.1016/j.ijhydene.2016.04.051

Cited by 90 publications

(34 citation statements)

References 49 publications

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“…The length of each bed is fixed at L MH1 = L MH1 = 450 mm. The jacket of LTMH (L MH1 = 470 mm and radius r PCM = 40 mm) is filled with a phase change material, fully insulated from the outside [44,45]. from LTMH bed at Tl and stored in the PCM.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The results showed that the COP could increase up to 1.4 when 100% internal heat recovery was assumed. In order to reduce the energy requirements during the hydrogenation/de-hydrogenation cycle of metal hydride tanks, several authors [43,44] suggested the integration of PCM as a passive heat transfer management. The objective of this study is to propose a combined two-tank latent and thermochemical heat storage for waste heat recovery.…”

Section: Introductionmentioning

confidence: 99%

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Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

2019

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Heat storage systems based on two-tank thermochemical heat storage are gaining momentum for their utilization in solar power plants or industrial waste heat recovery since they can efficiently store heat for future usage. However, their performance is generally limited by reactor configuration, design, and optimization on the one hand and most importantly on the selection of appropriate thermochemical materials. Metal hydrides, although at the early stage of research and development (in heat storage applications), can offer several advantages over other thermochemical materials (salt hydrates, metal hydroxides, oxide, and carbonates) such as high energy storage density and power density. This study presents a system that combines latent heat and thermochemical heat storage based on two-tank metal hydrides. The systems consist of two metal hydrides tanks coupled and equipped with a phase change material (PCM) jacket. During the heat charging process, the high-temperature metal hydride (HTMH) desorbs hydrogen, which is stored in the low-temperature metal hydride (LTMH). In the meantime, the heat generated from hydrogen absorption in the LTMH tank is stored as latent heat in a phase change material (PCM) jacket surrounding the LTMH tank, to be reused during the heat discharging. A 2D axis-symmetric mathematical model was developed to investigate the heat and mass transfer phenomena inside the beds and the PCM jacket. The effects of the thermo-physical properties of the PCM and the PCM jacket size on the performance indicators (energy density, power output, and energy recovery efficiency) of the heat storage system are analyzed and discussed. The results showed that the PCM melting point, the latent heat of fusion, the density and the thermal conductivity had significant impacts on these performance indicators.Energies 2019, 12, 3949 2 of 27 or combined cooling heating and power (CCHP), have been the predominant waste-heat recovery methods in power plants. These multi-generation processes allow for an improvement of thermal energy efficiency of up to 80%. On the other hand, for industrial process heat, the organic Rankine cycle (ORC), thermoelectric generators, heat pumps, and heat storage have been reviewed as potential methods for waste heat recovery [2]. However, the efficacy of either heat recovery method depends on the conditions at which heat is discharged (especially the temperature). There are mainly three factors affecting the implementation of waste heat recovery: the availability, the heat amount and quality (which is the temperature range). The temperature range depends on the waste heat source which ranges from thermal power plants (diesel engines, fossil fuels-fired power plants, PEM, and solid oxide fuel cells) to industrial processes (steel, cement, etc). On the one hand, if the heat is available at a constant temperature, therefore the selection of ORC and thermoelectric generators for heat recovery can improve the overall energy efficiency by generating extra electricity to the end-users. On the oth...

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

2019

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“…Main disadvantage is low gravimetric density, which does not exceed 1 -2 %wt., but it is not significant limitation for stationary applications [12,17]. To current date, there are a number of practical application of metal hydrides in hydrogen storage systems [18][19][20][21], hydrogen compression [22-28], hydrogen purification [29][30][31].…”

Section: Metal Hydride Technologiesmentioning

confidence: 99%

Metal hydride technologies for renewable energy

et al. 2019

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Significant progress in the installation of renewable energy requires the improvement of energy production and storage technologies. Hydrogen energy storage systems based on reversible metal hydride materials can be used as an energy backup system. Metal hydride hydrogen storage systems are distinguished by a high degree of safety of their use, since hydrogen is stored in a solid phase, a high volumetric density of stored hydrogen, and the possibility of long-term storage without losses. A distinctive feature of metal hydride materials is the reversible and selective absorption and release of high-purity hydrogen. This paper presents experimental studies of LaNi5-based metal hydride materials with a useful hydrogen capacity of 1.0–1.3 wt.% H2 with equilibrium pressures of 0.025 - 0.05 MPa and 0.1 - 1.2 MPa at moderate temperatures of 295 - 353 K for the hydrogen purification systems and hydrogen long-term storage systems, respectively. The applicability of metal hydride technologies for renewable energy sources as energy storage systems in the form of hydrogen is also shown.

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“…A lot of studies have been made regarding the modeling of hydrogen storage in metal hydride systems, but most of these studies are focused on hydrogen absorption reactions [2,6,[8][9][10][11][12][13][14][15][16][17][18][19][20], and numerical studies of the hydrogen desorption process are relatively rare [3,14,[19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, Chung et al [14] developed a two-dimensional model and investigated the effects of heat convection on the charging/discharging performance. Both Darzi et al [19] and Mellouli et al [21], analyzed the cooling and heating of a cylindrical LaNi5 metal hydride tank together with some kind of heat exchanger. The firsts ones, used an annular jacket filled with a phase change material (PCM), and the latter ones compared three different heat exchanger designs.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling, numerical simulation and experimental comparison of the desorption process in a metal hydride hydrogen storage system

Busqué

Torres²,

Grau³

et al. 2018

International Journal of Hydrogen Energy

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A two-dimensional axisymmetric model is developed to study the hydrogen desorption reaction and its subsequent discharge in a metal hydride canister. Experimental tests are performed on an in-house fabricated setup. An extensive study on the effects of the metal properties and boundary conditions on discharging performance is carried out through nondestructive testing (NDT). Results show that the desorption process is more effective if the activation energy for desorption (Ed) and the reaction enthalpy (∆H) decrease, and when the desorption rate coefficient (Cd) and the external convection heat transfer coefficient when the bottle is being heated (h) increase. Furthermore, porosity (ε) can be useful for the design of hydrogen storage systems, with a trade-off between charge/discharge time and storage capacity. Numerical and experimental results are compared achieving a good agreement. These results can be used to select metal hydride materials and also for the future evaluation of metal hydride degradation.

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Absorption and desorption of hydrogen in long metal hydride tank equipped with phase change material jacket

Cited by 90 publications

References 49 publications

Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

Metal Hydride Beds-Phase Change Materials: Dual Mode Thermal Energy Storage for Medium-High Temperature Industrial Waste Heat Recovery

Metal hydride technologies for renewable energy

Mathematical modeling, numerical simulation and experimental comparison of the desorption process in a metal hydride hydrogen storage system

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