Thermodynamics of crystallization of sodium sulfate decahydrate in H2O–NaCl–Na2SO4: application to Na2SO4·10H2O-based latent heat storage materials

Marliacy, Philippe; Solimando, Roland; Bouroukba, M.; Schuffenecker, L.

doi:10.1016/s0040-6031(99)00331-7

Cited by 62 publications

(27 citation statements)

References 9 publications

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“…In both cases, the precise concentration of sodium sulfate in the bulk solutions was measured by gravimetric analysis and the solubility of sodium sulfate was found to be equal to 1.03 at 18 1C ( 70.03) and 1.23 ( 70.05) mol kg À 1 H 2 O at 20 1C. Solubility values were in good agreement with solubility values reported earlier [22,25].…”

Section: Methodssupporting

confidence: 86%

Kinetics of crystal growth of mirabilite in aqueous supersaturated solutions

Vavouraki

Koutsoukos

2012

Journal of Crystal Growth

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Section: Methodssupporting

confidence: 86%

Kinetics of crystal growth of mirabilite in aqueous supersaturated solutions

Vavouraki

Koutsoukos

2012

Journal of Crystal Growth

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“…Heat, which was released during crystallization or consumed during salt dissolution, was measured. The enthalpy of sodium sulphate crystallization and dissolution as a function of temperature was experimentally determined [9]. The experimental setup was constructed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of sodium sulphate crystallization in porous materials

Koniorczyk

Konca

2012

Heat Mass Transfer

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The experimental setup was constructed to measure the thermal effect of the salt crystallization/dissolution process in building materials containing sodium sulphate. Additional heat was released/consumed during the salt crystallization/dissolution. The mathematical model of salt, moisture and energy transport concerning the salt phase change kinetics was derived and based on it the computer code was developed. To solve the set of partial differential, governing equations the finite element and finite difference methods were used. By solving the inverse problem the parameters of the rate law for brick saturated with the sodium sulphate solution were determined.

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“…Hence during cooling the crystallization process could be observed. An additional heat is released or consumed during the phase change of salt (Marliacy et al 2000).…”

Section: The Kinetics Of Salt Phase Changementioning

confidence: 99%

Numerical Modeling of Salt Transport and Precipitation in Non-Isothermal Partially Saturated Porous Media Considering Kinetics of Salt Phase Changes

Koniorczyk

Gawin

2010

Transp Porous Med

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Water and salts strongly influence the durability of porous materials. One of the most adverse phenomena which is related to the salt and moisture presence in the pore system of building materials is salt crystallization. The process is associated with the supersaturation ratio. The salt phase change kinetics is taken into account during the modeling of coupled moisture, salt, and heat transport. To solve the set of governing, differential equations the finite element and the finite difference methods are used. Three different rate laws are assumed in modeling the salt phase change. The drying, cooling, and warming of the cement mortar sample, during which the salt phase change occurs, have been simulated using the developed software. The changes of salt concentration in the pore solution and the amount of precipitated salt due to variation of boundary conditions are presented and discussed. The results obtained in the numerical simulation assuming the first, second, and fourth order rate low indicate that the higher order of the rate law the longer time delay between the change of boundary conditions and the salt precipitation. Such an analysis might be very useful during the determination of the material parameters by solving the inverse problem. List of SymbolsA Supersaturation parameter (−) C p Effective specific heat of porous medium (J/(kg K)) D d Tensor of hydrodynamic dispersion (m 2 /s) D g v Effective diffusivity tensor of vapor in the air (m 2 /s) D mol Molecular diffusivity (m 2 /s) g Acceleration of gravity (m/s 2 ) 123 58 M. Koniorczyk, D. Gawin H vap Enthalpy of vaporization per unit mass (J/kg) H prec Enthalpy of crystallization per unit mass (J/kg) I identity matrix (−) J dysp Dispersive flow of salt (kg/(m s)) J a g Diffusive flux of dry air (kg/(m s)) J v g Diffusive flux of water vapor (kg/(m s)) j ws = [ j ws 1 , j ws 2 ] Darcy velocity of water (m/s) j gs Darcy velocity of air (m/s) K Rate constant (rate law) (−) kIntrinsic permeability tensor (m 2 ) kIntrinsic permeability scalar (m 2 ) k rπ Relative permeability of π-phase (π = w, g-liquid, gas) (−) M π Molar mass of π = a, w, g-dry air, water, gas (kg/kmol) m vap Rate of mass due to evaporation (kg/(m 3 s)) m prec Rate of mass due to crystallization (kg/(m 3 s)) N π

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Thermodynamics of crystallization of sodium sulfate decahydrate in H2O–NaCl–Na2SO4: application to Na2SO4·10H2O-based latent heat storage materials

Cited by 62 publications

References 9 publications

Kinetics of crystal growth of mirabilite in aqueous supersaturated solutions

Kinetics of crystal growth of mirabilite in aqueous supersaturated solutions

Experimental and numerical investigation of sodium sulphate crystallization in porous materials

Numerical Modeling of Salt Transport and Precipitation in Non-Isothermal Partially Saturated Porous Media Considering Kinetics of Salt Phase Changes

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