On the use of a reduced model for the simulation of melting of solutions in DSC experiments

Gibout, Stéphane; Franquet, Erwin; Maréchal, William; Dumas, Jean‐Pierre

doi:10.1016/j.tca.2013.04.023

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…We recall that the eutectic melting occurs at fixed temperature and all the results described for pure substances are valuable and we have already presented results concerning eutectic meltings [13,14]. So the enthalpy function corresponds only to the progressive melting (equilibrium, at T, between the pure ice and the solution whose mass concentration is x(T)).…”

Section: Presentationmentioning

confidence: 99%

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Challenges of the Usual Graphical Methods Used to Characterize Phase Change Materials by Differential Scanning Calorimetry

et al. 2018

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Abstract:Modeling the thermal behavior of a plant or devices using Phase Change Materials (PCM) requires to know their thermophysical properties. The Differential Scanning Calorimetry (DSC) is a technic largely used to investigate them. However, under the pretext to experiment with small samples, some authors consider the DSC curves as directly representing the properties of the materials without realizing that this interpretation is very often incompatible with the thermodynamics laws: as an example, although a pure substance melts at a fixed temperature T F , it is proposed a melting through a temperature range higher than T F and depending on the experiments (heating rates, sample masses. . . ), for solutions the suggested characteristic temperatures are incompatible with the phase diagram, and also a hysteresis phenomenon is invented. . . . In this paper, we demonstrate by a model coupling thermodynamics and conduction heat transfers, that the DSC curves are exactly compatible with the thermodynamics of phase changes (melting at fixed temperature for pure substances, in conformity with phase diagrams for solutions. . . ). The cases of pure substances, saline solutions, substances with impurities or solid solutions are detailed. We indicate which information can, however, be given by the curves. We also propose a more sophisticated method by inverse calculations to determine the specific enthalpy whose all the thermodynamical properties can be deduced. Finally, we give some indications to understand and use the results indicating supercooling.

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Section: Presentationmentioning

confidence: 99%

“…For these cases of enthalpies, we have presented several papers [13,14] describing the construction of the thermogramms for such solutions. The model is the same that the one presented for the pure substances, but with a function h different given, in our simplified case, by Equation (18).…”

Section: Presentationmentioning

confidence: 99%

Challenges of the Usual Graphical Methods Used to Characterize Phase Change Materials by Differential Scanning Calorimetry

et al. 2018

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“…That's why PCM thermograms depend so much on the temperature scan speed, whatever the device used. Franquet et al [9] and Gibout et al [10] decided to develop a numerical tool to take into account the heat diffusion when interpreting thermograms. Their tool consists in an inverse method based on a heat diffusion model.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the natural convection perturbations on differential scanning calorimetry measurements of PCMs

2017

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The paper investigates the effect of natural convection during differential scanning calorimetry measurements of phase change materials. We performed series of numerical simulations to characterize and quantify the perturbation on the measured thermogram. This perturbation becomes significant at the end of the fusion process. It manifests itself as an increase of the heat flux amplitude which accelerates the fusion process. Three correlations are built from the simulation results. The two first correlations quantify the amplitude of the heat flux deviation. The third correlation locates the time at which the perturbation occurs. The correlations are valid for large DSC capsules (around 1ml), and high Prandtl materials (paraffins, salt hydrates, fatty acids). They enable to define the experimental conditions for which natural convection becomes negligible.

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“…In our view, while a DSC gives a useful first picture of a phase transition, high-quality data cannot be obtained with it. This is realised by researchers in the field of PCMs [15,16], and careful DSC use [17] and improved analysis of DSC data [18,19] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

A new calorimetric technique for phase change materials and its application to alkane-based PCMs

Duponchel

Longuemart

Glorieux

et al. 2016

Mater Renew Sustain Energy

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The correct determination of the phase transition behaviour of phase change materials (PCMs) is paramount for assessing their application potential. In this work, the merits of a novel calorimetric technique, Peltierelement-based adiabatic scanning calorimetry (pASC), for PCM characterisation are investigated, especially in comparison with the commonly-used differential scanning calorimeter (DSC). A comparative study of two alkanebased PCMs, the commercial mixture RT42 and the pure alkane tricosane (C23) with these two techniques shows that pASC provides data at much higher resolution than DSC, due to its operation in thermodynamic equilibrium. Specifically the rate-dependence and deformation that is inherent to DSC experiments is absent in pASC. In addition, the enthalpy of the PCM is directly obtained. pASC results easily conform to the accuracy limits that are proposed in literature for the transition temperature and storage capacity of PCMs.

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On the use of a reduced model for the simulation of melting of solutions in DSC experiments

Cited by 10 publications

References 25 publications

Challenges of the Usual Graphical Methods Used to Characterize Phase Change Materials by Differential Scanning Calorimetry

Challenges of the Usual Graphical Methods Used to Characterize Phase Change Materials by Differential Scanning Calorimetry

Quantification of the natural convection perturbations on differential scanning calorimetry measurements of PCMs

A new calorimetric technique for phase change materials and its application to alkane-based PCMs

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