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Inverse method for the identification of the enthalpy of phase change materials from calorimetry experiments

Franquet, E., Gibout, S., B¨¦d¨¦carrats, J., Haillot, D. and Dumas, J.
2012
Thermochimica Acta, Volume 546, 20 October 2012, Pages 61-80
Inverse method; Identification; Enthalpy; Thermodynamical properties; Phase change material; Pure substance; Binary solution; Differential scanning calorimetry; Thermogram

Franquet, E., Gibout, S., B¨¦d¨¦carrats, J., Haillot, D. and Dumas, J., (2012), "Inverse method for the identification of the enthalpy of phase change materials from calorimetry experiments", Thermochimica Acta, Volume 546, 20 October 2012, Pages 61-80.
Abstract:
Thermal energy storage is now a key parameter to overcome the delay between energy supply and demand in many applications. To address this issue, the use of phase change materials (PCM) tends to be more and more common. Given the attempted objectives of such applications, performances of the PCM are a cornerstone of the whole system. Therefore, a correct determination of their intrinsic properties is crucial. To perform this step, one may use a calorimetry experiment. Unfortunately, the interpretation of the thermogram is not straightforward and consequently, when not feasible at all, estimations may be wrong. As an example, pure substance as sometimes said to melt at a non-uniform temperature (their enthalpy being smeared over several degrees), and binary solutions are associated with liquidus temperature and latent heat that do not match the correct form of their enthalpy. The present work proposes a new method to avoid such issues. To summarize the novelty of our approach, the main idea is to use an inverse method to identify the thermodynamical parameters of the sample through a matching step between the experimental curves and theoretical ones. It means that contrary to many others methods, we do not directly extrapolate the thermodynamical properties (e.g. the enthalpy) from the thermogram. Instead, we suppose an a priori formulation of the enthalpy, based on thermodynamical principles. Thus the thermodynamical parameters are inputs of which only values are computed from the experiments. Capabilities of the method are shown on pure substances and binary solutions examples.

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Author Information and Other Publications Notes
Franquet, E.
  1. Comparison of different modelings of pure substances during melting in a DSC experiment
  2. Interpretation of calorimetry experiments to characterise phase change materials
  3. Model for the DSC thermograms of the melting of ideal binary solutions
  4. On the use of a reduced model for the simulation of melting of solutions in DSC experiments  
Gibout, S.
  1. Comparison of different modelings of pure substances during melting in a DSC experiment
  2. Interpretation of calorimetry experiments to characterise phase change materials
  3. Model for the DSC thermograms of the melting of ideal binary solutions
  4. On the use of a reduced model for the simulation of melting of solutions in DSC experiments  
B¨¦d¨¦carrats, J.
  1. Comparison of different modelings of pure substances during melting in a DSC experiment
  2. Modeling phase change materials behavior in building applications: Comments on material characterization and model validation  
Haillot, D.
  1. Model for the DSC thermograms of the melting of ideal binary solutions  
Dumas, J.
  1. Interpretation of calorimetry experiments to characterise phase change materials
  2. Model for the DSC thermograms of the melting of ideal binary solutions
  3. Modeling phase change materials behavior in building applications: Comments on material characterization and model validation
  4. On the use of a reduced model for the simulation of melting of solutions in DSC experiments
  5. Theoretical curves in thermal analysis for the melting of binaries showing solid solutions  


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