MgSO4·7H2O filled macro cellular foams: An innovative composite sorbent for thermo-chemical energy storage applications for solar buildings

Brancato, Vincenza; Calabrese, Luigi; Palomba, Valeria; Frazzica, Andrea; Fullana, Margalida; Solé, Aran; Cabeza, Luisa F.

doi:10.1016/j.solener.2018.08.075

Cited by 54 publications

(37 citation statements)

References 36 publications

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“…Thus the surface resistance control model is used for kinetic simulation with all the experimental conditions and the fraction conversion and mass loss rate are calculated using Eqs. (14) and (17) respectively. The experimental and simulated results are shown in Fig.…”

Section: Influence Of Temperaturementioning

confidence: 99%

“…Since the salt crystal of small size is dispersed within the porous structure, the problem of agglomeration is limited and both heat and mass transfer in the granular medium remain efficient, leading to an improvement of the material lifetime. The use of active porous matrix such as silica gel, zeolite, MOFs, etc... allows to benefit from the heat produced by the chemical reaction on the hygroscopic salt and by the adsorption on the porous material [14][15][16][17][18][19][20][21][22][23][24][25]. Nevertheless, the development of such a system remains a technological challenge, the main obstacle being the incomplete understanding of the involved physicochemical phenomena.…”

Section: Introductionmentioning

confidence: 99%

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New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

et al. 2020

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Magnesium sulfate-water vapor is an interesting working pair of thermochemical materials for compact inter-seasonal heat storage at low temperature. Total dehydration of magnesium sulfate heptahydrate shows a theoretical storage energy density of 2.8 GJ•m −3. However, kinetic data are poorly studied up to now making use of this material difficult for a practical storage application. In the present work, a kinetic study of the dehydration of MgSO4•6H2O powder at low temperature (35 to 60°C) and at low water vapor pressure (2 to 21 hPa) is carried out using thermogravimetric analysis in isobaric-isothermal conditions. A mathematical model is developed for this bivariant system and validated representing the mechanism of dehydration: water molecules diffusion in the solid solution followed by transfer of these molecules from the surface to the atmosphere. The transfer of water molecules at the surface during dehydration is identified as rate-determining step. The fractional conversion and reaction rate of the dehydration reaction are calculated and compared to the experimental data.

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Section: Influence Of Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

et al. 2020

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“…In such a context, an innovative concept was proposed by Brancato et al [19], employing a polymeric macro-porous foam to host MgSO 4 •7H 2 O salt. Among the advantages offered by foams, they allow further increase of the heat transfer surface with respect to porous materials and, in case of polymeric foams, they are flexible enough to host sufficient quantities of salt inside the pores, thus obtaining a high volumetric storage density and high mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Morphological and Structural Evaluation of Hydration/Dehydration Stages of MgSO4 Filled Composite Silicone Foam for Thermal Energy Storage Applications

et al. 2020

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Salt hydrates, such as MgSO4∙7H2O, are considered attractive materials for thermal energy storage, thanks to their high theoretical storage density. However, pure salt hydrates present some challenges in real application due to agglomeration, corrosion and swelling problems during hydration/dehydration cycles. In order to overcome these limitations, a composite material based on silicone vapor-permeable foam filled with the salt hydrate is here presented. For its characterization, a real-time in situ environmental scanning electron microscopy (ESEM) investigation was carried out in controlled temperature and humidity conditions. The specific set-up was proposed as an innovative method in order to evaluate the morphological evolution of the composite material during the hydrating and dehydrating stages of the salt. The results evidenced an effective micro-thermal stability of the material. Furthermore, dehydration thermogravimetric/differential scanning calorimetric (TG/DSC) analysis confirmed the improved reactivity of the realized composite foam compared to pure MgSO4∙7H2O.

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“…It is well known that bulk salt hydrates are highly susceptible to agglomeration when dehydrated at high temperatures. 34 Therefore, the agglomeration of sample FM40 can be attributed to the high amount of salt, which is not favorable for the target performance of the material. Moreover, excess amount of MgSO 4 to the micropore and textural pore of FAPO 4 -5 covers the porous particles.…”

Section: Dehydrated Materialsmentioning

confidence: 99%

MgSO₄ composites in a ferroaluminophosphate for enhancement of volumetric heat storage capacity at a low charging temperature

Nguyen

Hwang

Park

2020

Intl J of Energy Research

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Ferroaluminophosphate (FAPO 4-5)/MgSO 4 composites were prepared as a series of new materials with low charging temperatures and improved volumetric heat storage capacities. A microporous zeolithic compound FAPO 4-5 was used as an adsorbent of water vapor and a matrix of MgSO 4 salt particles. Composites with various MgSO 4 contents (5-40 wt%) were then prepared using a wet impregnation method. The MgSO 4 salt particles were impregnated into the micropores and textural pores of FAPO 4-5 without the crystal structure of the host material, confirmed by XRD patterns. Although nitrogen adsorption isotherms of the composites showed approximately a half of FAPO 4-5 pore was blocked by MgSO 4 , the water uptake of the composites reached the sum of those from FAPO 4-5 and MgSO 4. The dehydration temperature of MgSO 4 in the FAPO 4-5 matrix decreased with its decreasing content due to the easier dehydration of FAPO 4-5. The heat storage recovery of the 25 wt% loaded sample at 80 C was 85.5% while that of MgSO 4 was 52.2%. The swelling and agglomeration of the composites containing 25 wt% and less salt were suppressed by the micro and textural pores of FAPO 4-5. The composite at 25 wt% of MgSO 4 loading exhibited a total volumetric heat storage capacity of 174 kW h m −3 based on the volume in the hydrated state.

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MgSO4·7H2O filled macro cellular foams: An innovative composite sorbent for thermo-chemical energy storage applications for solar buildings

Abstract: Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 4.

Cited by 54 publications

References 36 publications

New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

Morphological and Structural Evaluation of Hydration/Dehydration Stages of MgSO4 Filled Composite Silicone Foam for Thermal Energy Storage Applications

MgSO₄ composites in a ferroaluminophosphate for enhancement of volumetric heat storage capacity at a low charging temperature

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MgSO4·7H2O filled macro cellular foams: An innovative composite sorbent for thermo-chemical energy storage applications for solar buildings

Abstract: Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 4.

Cited by 54 publications

References 36 publications

New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

New kinetic model of the dehydration reaction of magnesium sulfate hexahydrate: Application for heat storage

Morphological and Structural Evaluation of Hydration/Dehydration Stages of MgSO4 Filled Composite Silicone Foam for Thermal Energy Storage Applications

MgSO4 composites in a ferroaluminophosphate for enhancement of volumetric heat storage capacity at a low charging temperature

Contact Info

Product

Resources

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MgSO₄ composites in a ferroaluminophosphate for enhancement of volumetric heat storage capacity at a low charging temperature