Performance analysis of cylindrical metal hydride beds with various heat exchange options

Sekhar, B. Satya; Lototskyy, Mykhaylo; Колесников, А. В.; Moropeng, Mapula Lucey; Тарасов, Б. П.; Pollet, Bruno G.

doi:10.1016/j.jallcom.2014.12.272

Cited by 61 publications

(18 citation statements)

References 18 publications

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“…Modelling of heat transfer performance of MH beds on the basis of the AB 5 -type alloys showed that externally heated and cooled cylindrical beds with a high length-to-diameter ratio is an optimal solution due to (i) high heat exchange area between the MH and the heating/cooling fluid, (ii) simplicity and lower cost and (iii) less pronounced reduction of hydrogen storage capacity at the same dimensions as compared to the solutions with internal heat exchangers [21]. According to the modelling results verified by experiments [22], the externally heated and cooled cylindrical stainless steel containers, about 20 mm in the internal diameter and about 800 mm in the length, filled by the selected AB 5 -type materials, are characterised by satisfactory H 2 absorption/desorption (H 2 charge/discharge times shorter than 20 min), if averaged heat transfer coefficient between the MH container walls and the heating/cooling fluid is about 500 W m −2 K and higher.…”

Section: Metal Hydride Bed and Hydrogen Compression Modulementioning

confidence: 99%

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Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Тарасов

Bocharnikov

Yanenko³

et al. 2020

J. Phys. Energy

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This work summarises the results of development and long-term testing of two prototype models of industrial-scale metal-hydride thermal sorption hydrogen compressors, TSC1-3.5/150 (up to 11 Nm 3 h −1 ; water cooling/steam heating) and TSC2-3.5/150 (up to 15 Nm 3 h −1 ; heating and cooling by circulating oil). Both compressors have a two-stage layout utilising LaNi 5 for the stage 1 and La 0.5 Ce 0.5 Ni 5 for stage 2, thus providing hydrogen compression from 0.35 to 15 MPa at a cooling temperature of about 20°C and a heating temperature between 150°C and 160°C. The compressors were operating for one year each and exhibited a satisfactory performance. The results of this work can be used in various medium-to-large scale hydrogen compression applications, including renewable energy systems.

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Section: Metal Hydride Bed and Hydrogen Compression Modulementioning

confidence: 99%

“…This work summarises the results of joint development, by SKTBE and IPCP, and long-term operation of two models of two-stage metal hydride hydrogen compressors, TSC1-3.5/150 and TSC2-3.5/150. Further details have been published in [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Тарасов

Bocharnikov

Yanenko³

et al. 2020

J. Phys. Energy

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“…Whereas, increasing effective thermal conductivity of MH facilitated substantial reduction in the absorption and desorption times. Satya Sekhar et al 37 numerically examined the performance of different heat exchanger options for a cylindrical metal hydride container filled with MmNi 4.6 Al 0.4 . Four different cooling arrangements were considered, namely internal straight tube, internal helical, external cooling channel and external cooling channel with internal transverse fins.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on absorption and desorption characteristics of La _0.9 Ce _0.1 Ni ₅ for hydrogen storage application

2020

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Summary In the present work, an experimental investigation is carried out to study the absorption and desorption characteristics of a metal hydride reactor filled with 1.4 kg of La0.9Ce0.1Ni5. A simple tubular reactor with an outer cooling jacket was fabricated. The effects of supply pressure and absorption temperature on hydriding rate and the effect of desorption temperature on dehydriding rate were analyzed. From the parametric study, it is observed that the supply pressure has a substantial effect on the amount of hydrogen absorbed than that of absorption temperature. The amount of hydrogen absorbed was increased by 45% when supply pressure was increased from 10 to 30 bar, whereas the same was increased by only 6.6% when the absorption temperature was decreased from 20°C to 10°C. The increment in the desorbed mass of hydrogen was 20.4% when desorption temperature was increased from 70°C to 90°C. To accelerate the desorption process, intermediate sensible heating was carried out. After 50 cycles of operation under different conditions, the amount of hydrogen absorption was dropped from 19.1 to 15.52 g at a supply pressure of 40 bar, whereas the amount of hydrogen desorption was decreased from 13.8 to 10.5 g at the desorption condition of 70°C.

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“…Coolant channels or heat transfer fins have been considered because they increase the heat transfer area without creating the aforementioned issues. Transverse or longitudinal cooling fins were used in tubular and box-shaped reactors [10,[23][24][25]. A plate-fin type heat exchanger in a rectangular reactor has been experimentally tested [23].…”

Section: Introductionmentioning

confidence: 99%

“…For a tubular reactor, three designs (coolant channels with fins, helical coils, and shell-and-tube) have been optimized and compared [24]. Another study compared a straight channel with a helical coil for internal cooling and also investigated cooling performance improvements by the addition of external transversal fins [25]. A systematic optimization routine for internal fin design was performed to determine geometrical parameters [10].…”

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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Performance analysis of cylindrical metal hydride beds with various heat exchange options

Cited by 61 publications

References 18 publications

Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Experimental investigation on absorption and desorption characteristics of La _0.9 Ce _0.1 Ni ₅ for hydrogen storage application

Optimization of Internal Cooling Fins for Metal Hydride Reactors

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Performance analysis of cylindrical metal hydride beds with various heat exchange options

Cited by 61 publications

References 18 publications

Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Metal hydride hydrogen compressors for energy storage systems: layout features and results of long-term tests

Experimental investigation on absorption and desorption characteristics of La 0.9 Ce 0.1 Ni 5 for hydrogen storage application

Optimization of Internal Cooling Fins for Metal Hydride Reactors

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Product

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Experimental investigation on absorption and desorption characteristics of La _0.9 Ce _0.1 Ni ₅ for hydrogen storage application