Performance of a solid state hydrogen storage device with finned tube heat exchanger

Singh, Anurag; Maiya, M.P.; Murthy, S. Srinivasa

doi:10.1016/j.ijhydene.2017.06.071

Cited by 53 publications

(11 citation statements)

References 28 publications

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“…U-shaped tubes can partially replace the application of straight tubes due to their compact structure, excellent heat transfer performance, and ease of maintenance management. [45][46][47] The spiral tubes have excellent axial elasticity, which not only mitigates the stress generated by temperature changes and volume expansion but also enhances the turbulence strength and reduces the thermal resistance of the heat transfer uid. 42,48 Studies have shown that spiral tubes are signicantly more effective than straight tube heat exchangers 49 and slightly superior to the ns 40,50 in improving the heat and mass transfer of the MHR.…”

Section: Addition Of Cooling Devicesmentioning

confidence: 99%

“…When the diameter of the straight tubes is doubled, the hydrogen absorption time can be reduced by 25%. 61 When the diameter of the U-tubes increases from 3.4 mm to 5.4 mm, the hydrogen absorption time decreases from 725 s to 515 s. 45 However, when the diameter increases to a certain extent, there is a smaller effect on the heat transfer of the MHB; instead, more volume of MHB is occupied and the amount of hydrogen storage is reduced. 30 In most cases, embedded tubes are placed in a central area arrangement for a single tube (Fig.…”

Section: Addition Of Cooling Devicesmentioning

confidence: 99%

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Review of thermal management technology for metal hydride reaction beds

Miao

Liu

et al. 2023

Sustainable Energy Fuels

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Section: Addition Of Cooling Devicesmentioning

confidence: 99%

Section: Addition Of Cooling Devicesmentioning

confidence: 99%

Review of thermal management technology for metal hydride reaction beds

Miao

Liu

et al. 2023

Sustainable Energy Fuels

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“…Similarly, the geometrical parameters (width, thickness) and the number of fins of different shapes (transverse, longitudinal, conical, honeycomb structured, branched structured) are also optimized by various researchers 35‐38 . The combination of cooling tubes and fins is also integrated into metal hydride reactors for better heat transfer management 39‐41 …”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37][38] The combination of cooling tubes and fins is also integrated into metal hydride reactors for better heat transfer management. [39][40][41] It is observed from the literature that many efforts have been made to improve the heat transfer rate inside the metal hydride bed, which results in faster reaction kinetics. However, the majority of these studies focus on small-scale systems.…”

Section: Introductionmentioning

confidence: 99%

Parametric and sensitivity analysis of metal hydride hydrogen storage systems for development of novel design charts

Tiwari

Sharma

2022

Energy Storage

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Hydrogen storage is the biggest challenge towards the widespread utilization of hydrogen as an energy carrier. One of the methods is solid‐state storage of hydrogen in the metal hydride, which is safe, volumetrically efficient, and involves an optimal set of operating conditions. However, designing reactors for metal hydride storage involves much thermal management since the absorption and desorption are exothermic and endothermic reactions, respectively. Many optimization and simulations are involved before arriving at a suitable metal hydride reactor design for a particular application. This study focuses on developing easy‐to‐use design charts to evaluate reaction fractions inside the metal hydride bed for various combinations of parameters. First, the parameters affecting the reaction fraction are selected, and the range for each of these parameters is defined. The dependence of each parameter on the reaction fraction is analysed, maintaining the mean value of the remaining parameters. The LaNi5 is used as a metal hydride for this study. A two‐dimensional (2‐D) mathematical model is developed to evaluate the effect of these parameters on reaction fraction. Further, based on this detailed parametric study, a sensitivity analysis has been carried out to determine the most significant parameters. It was observed from this parametric and sensitivity analysis that among the considered parameters, the volume of the reactor (amount of hydrogen to be stored) and length to diameter ratio have a more dominant effect on the reaction fraction followed by supply pressure and thermal conductivity of metal hydride. However, the external temperature of heat transfer fluid (ie, the ambient temperature) does not significantly affect the reaction fraction. Hence, this parameter is assumed to be constant in developing design charts. Also, based on this analysis, the range of parameters is redefined for design charts. Further, this 2‐D mathematical model and parametric and sensitivity analysis are used to develop the design charts. These design charts use the most sensitive parameters and demonstrate the effect of all the other parameters on the reaction fraction. Finally, the method of using these design charts and their accuracy is explained for reaction fraction evaluation for a particular set of parameters. These charts are easy‐to‐use and accurate for the quick preliminary reaction fraction estimation for metal hydride hydrogen storage system.

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“…Higher gravimetric and volumetric capacity was observed in hexagonal cooling tubes of length 0.952 m than circular ones; also, the influence of thermal contact is evaluated. Anurag et al 9 investigated the performance of a 1 kg metal hydride bed embedded with a finned heat exchanger. Copper flakes were added and evenly distributed to increase the thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Modeling and numerical simulation of an industrial scale metal hydride reactor based on CFD‐Taguchi combined method

Mallik

Sharma

2021

Energy Storage

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This study proposes a cylindrical reactor design embedded with bifurcating longitudinal finned cooling tubes as the heat exchanger for an industrial-scale metal hydride reactor system. We use Taguchi method as an optimization technique for the design parameters. The model performance was simulated with an objective of attaining the least time of absorption. The optimization involved seven control factors in an array of L 18 (2 1 3 6 ). We observed that the number of cooling tubes, the fin length, and the number of fins are the most critical parameters for optimizing absorption time. A three-dimensional numerical model has been developed using COMSOL Multiphysics 5.2a to predict the optimized design's hydriding performance. The absorption characteristics were studied based on the variation of pressure and heat transfer fluid temperature. At a supply pressure of 20 bars and a cooling fluid temperature of 20 C in a 50 kg system with 8 bifurcating finned cooling tubes, a hydrogen storage capacity of 1.21 wt% was achieved in 700 seconds. This paper highlights an optimized design's efficiency and operating parameter's influence to garner the best performance for rapid hydrogen charging.

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Performance of a solid state hydrogen storage device with finned tube heat exchanger

Cited by 53 publications

References 28 publications

Review of thermal management technology for metal hydride reaction beds

Review of thermal management technology for metal hydride reaction beds

Parametric and sensitivity analysis of metal hydride hydrogen storage systems for development of novel design charts

Modeling and numerical simulation of an industrial scale metal hydride reactor based on CFD‐Taguchi combined method

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