Performance of SrBr2·6H2O based seasonal thermochemical heat storage in a novel multilayered sieve reactor

Li, Wei; Guo, Hao; Zeng, Min; Wang, Qiuwang

doi:10.1016/j.enconman.2019.111843

Cited by 46 publications

(11 citation statements)

References 45 publications

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“…For the composites, this parameter strongly depends on the conditions of a thermochemical cycle since the sorption mechanisms may differ. If the initial state is LiCl, CaCl 2 , or SrBr 2 ·H 2 O and the final state is a salt solution, the gravimetric storage density (GSD) may be calculated by summing the reaction enthalpy (for the processes (6)–(9)), melting enthalpy of the highest hydrate, and dilution enthalpy (the data are taken from refs , , − ) where M is the molar mass, ρ bed is the bed density, Δ r H 0 , Δ m H 0 , and Δ ab H 0 are reaction, melting, and absorption enthalpies, respectively, and the initial sorption a 0 corresponds to the highest hydrate, while the total sorption a is determined from the sorption isotherms (Figure ) for specific cycle conditions.…”

Section: Resultsmentioning

confidence: 99%

“…The most popular approach so far is the accommodation of a salt hydrate in pores of a matrix that serves both as a rigid shell and a binder. − While a plethora of commercial matrices for salt stabilization is reported in the literature, there are just a few popular salts to be stabilized, namely, CaCl 2, MgSO 4, LiCl, and, since very recently, SrBr 2 ·6H 2 O. , Typical values of VSD for the composites vary from 0.4 GJ/m 3 for composites with a very high bed porosity of 80% to 1 GJ/m 3 for tablets of a composite. It is noteworthy that the authors rarely report the cycling stability of such composites.…”

Section: Introductionmentioning

confidence: 99%

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Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Shkatulov

Joosten

Fischer

et al. 2020

ACS Appl. Energy Mater.

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The advent of thermochemical energy storage (TcES), that is, storage of thermal energy by means of reversible chemical reactions, incites finding pathways of stabilization of thermochemical materials for thermal batteries of the future. Currently, salt hydrates such as LiCl·H2O, CaCl2·6H2O, and SrBr2·6H2O are being actively studied for TcES in buildings due to both high energy storage density (1–2.5 GJ/m3) and high storage duration. In this work, we report the core–shell composites “salt in hollow SiO2 spheres with mesopores” (salt = LiCl·H2O, CaCl2·6H2O, SrBr2·6H2O) for domestic TcES. The salt hydrates were encapsulated into submicrometer-sized hollow SiO2 (HS) capsules as confirmed by transmission electron microscopy (TEM) and N2 sorption analyses. High sorption/desorption rates due to mesopores of the shells were shown by thermogravimetric analysis (TGA). The sorption equilibrium for salt@HS was reported, and the applicability of the materials for domestic heat batteries was analyzed. As a result of almost the densest packing of salt@HS, the composites were shown to provide a state-of-the-art energy storage density up to 0.86 GJ/m3 on the bed level for the high-temperature lift of 32–47 °C, showing high energy storage capacity. The stability in at least 50 charging/discharging cycles was confirmed by TGA and TEM.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Shkatulov

Joosten

Fischer

et al. 2020

ACS Appl. Energy Mater.

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“…This new strategy helped to reduce the desorption temperature of the TCM without reducing its energy storage density. Recently, another simulation study was performed on an open system with a multi‐layered sieve reactor using the COMSOL 30 . In this study, strontium bromide hexahydrate was used as a TCM.…”

Section: Introductionmentioning

confidence: 99%

Sustainable and open sorption system for low‐temperature heat storage applications

Padamurthy

Nandanavanam

Parameshwaran

2022

Intl J of Energy Research

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Summary In the present study, an open sorption thermochemical energy storage (TCES) system was developed and investigated experimentally for low‐temperature heat storage applications using zeolites. Desorption and adsorption experiments were carried out sequentially for 15 cycles to study the energy storage and retrieval characteristics. Further, the performance characteristics were analysed to find the system's suitability for intended applications. The charging and discharging processes were carried out respectively at around 95°C and room temperature, for zeolite 13X and zeolite 4A. Zeolite 13X exhibited better average total energy storage density during the desorption and adsorption and they are respectively 129.4 and 57 kWh/m3. The average cumulative energy storage efficiency for zeolite 13X and zeolite 4A are respectively 44.1% and 24%. Similarly, the average exergy efficiency for zeolite 13X and zeolite 4A are respectively 21.5% and 11%. For the tested thermochemical materials (TCMs), the deviations in mass change due to multi‐cycle test‐run was small and hence suitable for long‐term usage without concern about their stability. The present study has demonstrated the technical competence in utilizing the energy sources (eg, solar energy, industrial waste heat) towards low‐temperature heat storage applications, viz. building's space heating and water heating.

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“…13,14 Considering that medium-and high-temperature reactions can only use concentrated solar energy, the reaction between salt hydrates and water vapor has attracted great attention as the temperature range suitable for natural sunlight and the low cost of thermal storage materials. The heat storage/release process is mainly based on the reversible reaction shown below: 15 At present, the commonly used salt hydrates for thermochemical heat trans-seasonal storage of solar energy are LiCl, 16,17 CaCl 2 , 18,19 MgCl 2 , 20,21 SrBr 2 , 22,23 and MgSO 4 . 24,25 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.…”

Section: Introductionmentioning

confidence: 99%

“…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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Performance of SrBr2·6H2O based seasonal thermochemical heat storage in a novel multilayered sieve reactor

Cited by 46 publications

References 45 publications

Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Sustainable and open sorption system for low‐temperature heat storage applications

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

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Performance of SrBr2·6H2O based seasonal thermochemical heat storage in a novel multilayered sieve reactor

Cited by 46 publications

References 45 publications

Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Core–Shell Encapsulation of Salt Hydrates into Mesoporous Silica Shells for Thermochemical Energy Storage

Sustainable and open sorption system for low‐temperature heat storage applications

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

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Product

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