Modeling of heat transfer and fluid flow in epsom salt (MgSO4•7H2O) dissociation for thermochemical energy storage

Kharbanda, Jagtej Singh; Yadav, Sateesh Kumar; Soni, Vikram; Kumar, Arvind

doi:10.1016/j.est.2020.101712

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…Macroscale simulation usually studies the heat transfer and fluid flow problem by solving Naiver-Stokes equations. Kharbanda et al 12 analyzed the thermophysical behavior using this method in dissociation reaction of MgSO 4 Á 7H 2 O. They delineate the role of vapor flow on the physical behavior of the thermochemical energy storage system for the first time.…”

Section: Simulation Methodsmentioning

confidence: 99%

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

2021

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Middle-low temperature sorption thermal storage materials (STSMs), which are widely applied in the waste heat utilization, can overcome the mismatch of thermal energy between supply and consumption. Many researchers have paid more attention to its complicated mechanism, particularly in the chemisorption process. Unlike the scientific experiment, microscale simulation has an immerse advantage of its low costs, high security, and high precision, which exploring the sorption mechanism at a molecular level. In this review, the microscale simulation method and its application in researching the sorption mechanism are summarized. We mainly stuck in three commonly microscale simulation methods: density functional theory, molecular dynamics, and Monte Carlo method. The diffusion, sorption isotherm and sorption heat, sorption dynamics, chemical reaction pathways, and structural stability are comprehensively examined, which illustrating how the interaction between adsorbate and adsorbent influences the properties of kinetics, thermodynamics, chemistry, and structure.Updating the algorithm, developing the multiscale simulation, establishing a database is promising to extend its application range of design the novel STSMs. Furthermore, as a smart bottom-up method for designing materials, combing with experiment, theoretical calculation, and other burgeoning technology will shorten the time cycle from development to market.

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Section: Simulation Methodsmentioning

confidence: 99%

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

2021

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“…[11] TCS, which can upgrade the stored heat at an arbitrary temperature with high heat storage densities, [12][13][14][15] and no heat loss, [16] is more suitable for efficient utilization of low-grade thermal energy. There are many literature that have described the adsorption process of metal salts with water, [17][18][19][20] ammonia, [21][22][23][24][25] methanol, [26][27][28] or metal alloys, [29,30] for utilizing low-grade thermal energy. Among all the reaction systems, the inorganic hydrate lithium hydroxide monohydrate (LiOH•H 2 O) due to its high energy density (1440 kJ kg À1 ) and mild reaction process was selected as the promising candidate for low-temperature (below 373 K) heat storage.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of 3D Graphene–LiOH·H₂O Composites by Modification with Phytic Acid and Ascorbic Acid for Low‐Grade Thermal Energy Storages

Zeng

et al. 2021

Energy Tech

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3D Graphene (3D‐GF) modified with different additive concentrations (phytic acid [PA] and ascorbic acid [AA]) is developed and then combined with different LiOH contents by the hydrothermal method to obtain composite materials. It can be found that the addition of PA and AA will not destroy the carbon skeleton structure of 3D‐GF. With increasing additive content, the thermal conductivities of modified 3D‐GF first increase and reach their maximum values at 8 mg mL−1. The modified 3D‐GF with the highest thermal conductivity is selected to be combined with different LiOH contents. The addition of PA and AA can broaden the charging temperature range from 60–110 to 30–200 °C and improve the LiOH hydration rate and heat storage density. Compared with the PA‐modified composite, the AA‐modified composite shows smaller (about 7.6 nm) and more uniform LiOH·H2O particles (the particles size standard deviation of 3D‐GF‐AA‐LiOH·H2O is 1.1503), a larger specific surface area (119 m2 g−1), higher heat storage density (the highest value of 2763 kJ kg−1 for LiOH⋅H2O, which can be about 4.2 times of pure LiOH), and less influenced by the change of LiOH content (the thermal conductivity standard deviation of 3D‐GF‐AA‐LiOH·H2O is 0.123).

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“…At present, the commonly used salt hydrates for thermochemical heat trans-seasonal storage of solar energy are LiCl, , CaCl 2 , , MgCl 2 , , SrBr 2 , , and MgSO 4 . , For salt with low deliquescence relative humidity (DRH) like CaCl 2 , the dissolution of the salt hydrates occurs when the relative humidity is higher than DRH . The formation of the solution might hinder the diffusion of water vapor, resulting in the decrease of sorption rate and incomplete sorption of salt.…”

Section: Introductionmentioning

confidence: 99%

Scalable Production of EP/CaCl₂@C Multistage Core–Shell Sorbent for Solar-Driven Sorption Heat Storage Application

et al. 2021

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The sorption heat storage based on composites with salt hydrates enables the efficient utilization and trans-seasonal storage of solar energy. Nevertheless, the limitation of heat and mass transfer of salt hydrates has restricted the implementation of this technology. Here, a novel strategy is proposed to synthesize a multistage core–shell sorbent, where salt hydrates are dispersed in the macropores of the expanded perlite (EP) before being coated with a carbon layer outside the EP/Ca particles. The abundant macropores in the matrix are beneficial to the high salt loading and efficient mass transfer. Moreover, the carbon shell significantly enhances the light-to-heat conversion performance of the sorbent, and the heat can be directly transferred from the shell to the internal salt hydrates for desorption, thus realizing the absorption, conversion, and storage of solar energy in the multistage core–shell sorbent. The sorption capacity of EP/Ca@C-0.25 is determined to be 1.22 g-H2O/g-sorbent under the conditions of 20 °C and RH 80%, and 84% of the water can be desorbed after irradiation under the 1 kW/m2 simulated sunlight for 2 h, with a heat storage density of 1698 J/g-sorbent in the heat storage process. Additionally, we also studied the performance of EP/Ca@C-0.25 in a solar-driven thermal energy storage system. In summer, the sorbent is placed outdoors and desorbed under sunlight within 2 h to achieve heat storage. In winter, the sorbent is placed in a fixed bed for adsorption, and the heat released during adsorption increases the air temperature by 5 °C for 10 h. Typically, the multistage core–shell sorbent demonstrates a potential sorbent for large-scale use in solar-driven thermal energy storage for practical purposes.

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Modeling of heat transfer and fluid flow in epsom salt (MgSO4•7H2O) dissociation for thermochemical energy storage

Cited by 12 publications

References 34 publications

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

Comparative Analysis of 3D Graphene–LiOH·H₂O Composites by Modification with Phytic Acid and Ascorbic Acid for Low‐Grade Thermal Energy Storages

Scalable Production of EP/CaCl₂@C Multistage Core–Shell Sorbent for Solar-Driven Sorption Heat Storage Application

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Modeling of heat transfer and fluid flow in epsom salt (MgSO4•7H2O) dissociation for thermochemical energy storage

Cited by 12 publications

References 34 publications

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

Study on the sorption mechanism of middle‐low temperature sorption thermal storage materials from the microscale simulation: A review

Comparative Analysis of 3D Graphene–LiOH·H2O Composites by Modification with Phytic Acid and Ascorbic Acid for Low‐Grade Thermal Energy Storages

Scalable Production of EP/CaCl2@C Multistage Core–Shell Sorbent for Solar-Driven Sorption Heat Storage Application

Contact Info

Product

Resources

About

Comparative Analysis of 3D Graphene–LiOH·H₂O Composites by Modification with Phytic Acid and Ascorbic Acid for Low‐Grade Thermal Energy Storages

Scalable Production of EP/CaCl₂@C Multistage Core–Shell Sorbent for Solar-Driven Sorption Heat Storage Application