Hydration and dehydration of salt hydrates and hydroxides for thermal energy storage - kinetics and energy release

Rammelberg, Holger Urs; Schmidt, Thomas J.; Rück, Wolfgang

doi:10.1016/j.egypro.2012.11.043

Cited by 103 publications

(57 citation statements)

References 7 publications

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“…4 shows the extent conversion of MgCl 2 Á6H 2 O at a heating rate of 1 K/min, with the first conversion phase to tetrahydrate at 85°C and the second conversion to dihydrate at 120°C. Rammelberg et al [19] in their experimental work, found that the first (tetrahydrate) and the second (dihydrate) conversion phase take place respectively at 82°C and 116°C. The experimental curve shows in the beginning of the decomposition a high reaction rate until a conversion of 40% and then decrease rapidly at 22% of conversion.…”

Section: Kinetics Model Of Thermal Decompositionmentioning

confidence: 97%

“…Recently kinetic and energy release aspects have been demonstrated in different groups [16][17][18][19][20][21]. It has been shown that for the following salt hydrates, the dehydration process is divided into many stages through the general reactions:…”

Section: Storage System Concept: Thermal Decompositionmentioning

confidence: 99%

“…Using our Eq. (7) and the experimental data [19], we obtained the following curves based on the account for partial pressure. Fig.…”

Section: Kinetics Model Of Thermal Decompositionmentioning

confidence: 99%

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Thermal decomposition kinetic of salt hydrates for heat storage systems

et al. 2015

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Section: Kinetics Model Of Thermal Decompositionmentioning

confidence: 97%

Section: Storage System Concept: Thermal Decompositionmentioning

confidence: 99%

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Thermal decomposition kinetic of salt hydrates for heat storage systems

et al. 2015

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“…It is a hygroscopic salt that is able to absorb water molecules even at room temperature and to release water molecules when heated, providing high energy storage capacity [32,33]. Besides, the main interest of the use of calcium chloride is its low cost [34,35].…”

Section: Introductionmentioning

confidence: 99%

Water sorption heats on silica-alumina-based composites for interseasonal heat storage

Jabbari-Hichri

Bennici

Auroux

2014

J Therm Anal Calorim

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CaCl 2 -containing composites have been prepared by depositing the hydrated salt (by incipient wetness impregnation) on three different silica-aluminas with various Si/Al ratios. The surface area and porosity of all the samples were determined by N 2 -adsorption at -196°C, and their water sorption properties were investigated by thermogravimetry linked to differential scanning calorimetry (TG-DSC) in order to determine the quantity of adsorbed/desorbed water and the related heats. The heat released and the quantity of adsorbed water were found to depend on parameters such as the silica-alumina pore diameters, the Si/Al ratio, and the presence of accessible CaCl 2 active phase. The short-term stability of both supports and composites has been also checked by performing successive hydration-dehydration cycles. The sample with the lower Si/Al ratio provided the highest heat per surface area of material, and the heat released per mol of water increased with the amount of Al 2 O 3 present in the samples. The deposition of CaCl 2 positively acted on the quantity of heat released during the water sorption, and the composite with the higher alumina content (75 mass% Al) showed the largest heat released per m 2 of material (2.4 J m -2 ) compared to those containing 25 and 13 mass% Al (1.4 and 1.2 J m -2 , respectively).

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“…A three-dimensional model in Co msol Multiphysics 4.3a has been developed to simulate the charging of the storage bed using the two different heat exchangers and comparison is made in term of thermal performance in o rder to choose the appropriate heat exchanger. The magnesium chloride properties used in this work is based on the values reported by Rammelberg et al [9].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Heat Exchangers Based on Thermochemical Material for Solar Heat Storage Systems

et al. 2014

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In solar thermal energy storage systems the operation modes involve charging and discharging. This paper focuses only on the charging leading to an endothermic reaction and therefore an efficient heat exchanger is required to transfer the heat for fast and complete charging. Two different heat exchangers are studied in this paper. A plate fin and helical coil heat exchangers embedded in a magnes ium chloride bed is modelled and solved using the software Comsol 4.3a based on finite element method. M eshing analysis is performed for parameters sensibility and the results show a temperature variation of 13 °C (helical coil) and 19 °C (plate fin) in the material bed during the charging mode of the thermochemical heat storage system. The pressure distribution in the heat transfer fluid and the temperature distribution in the material bed are presented and the calculated overall heat transfer coefficient of 173 W/m 2 ·K (helical coil) and 236 W/m 2 ·K (plate-fin) are obtained on the base of the total heat transferred (Q) to through the system. The fluid flow is in turbulence regime (Re = 13200) in the fin-plate, but in laminar mode (can be kept up to Re = 20000) [1] in the coil because the flow is affected by secondary flow cause by centrifugal forces. This study allows the choice of the h eat exchanger wherein with first experiment has been made and compared.

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Hydration and dehydration of salt hydrates and hydroxides for thermal energy storage - kinetics and energy release

Cited by 103 publications

References 7 publications

Thermal decomposition kinetic of salt hydrates for heat storage systems

Thermal decomposition kinetic of salt hydrates for heat storage systems

Water sorption heats on silica-alumina-based composites for interseasonal heat storage

Modelling of Heat Exchangers Based on Thermochemical Material for Solar Heat Storage Systems

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