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SOLAR
CHARACTERIZATION OF THERMOPHYSICAL PROPERTIES OF COMMERCIAL PARAFFINS FOR USES IN APPLICATIONS OF THERMAL SOLAR ENERGYArnold R. M. Guarín1, Manuel J. O. Pérez2, Cristina I. C. Torres2, Mauricio Y. C. García3, Jorge M. M. Fandiño2, Adrian E. A. Gomez2
1Universidad de Córdoba - Universidad del Norte, 2Universidad de Córdoba, 3Universidad del Norte
E-mail: arnoldrafael@correo.unicordoba.edu.co
The characterization of phase change materials is essential to identify which of the commercially available materials can be used in Thermal Energy Storage (TES) applications. Conventionally, the characterization methods of these materials involve high costs due to the use of specialized equipment and very rigorous experimentation protocols, since they require that thermal equilibrium be satisfied, which occurs at low speeds. In this investigation, low-cost methods such as T-History and T-Melting CHF were replicated, which allow to determine the melting point, latent heat of fusion, thermal conductivity and specific heat capacity in both solid and liquid phases in phase change materials (PCM). The necessary devices were constructed for each method of analysis and validated by comparison using as references RUBITHERM® RT45 and RT55 paraffins, which are internationally certified by the RAL.The tests with both commercially available paraffin methods were performed, which were compared with the results of enthalpy and specific heat obtained by Differential Scanning Calorimetry (DSC) and the standard deviation between the two proposed methods was evaluated with respect to the results obtained in the DSC. Additionally, the liquid and solid density was calculated for each of the samples, which coincided with those indicated by the manufacturer. The results obtained were tabulated, in order to make a direct comparison between the values obtained from the thermophysical properties through the different methods in order to determine if they can be considered with good potential for later use in storage applications thermal energy.
Palavras-chave: thermal energy storage, PCM, DSC.
Agradecimentos: Authors would like to acknowledge Universidad Del Norte and his PhD Scholarship Contract Identification Number: UN-OJ-2013-22063, and the Departamento Administrativo de Ciencia, Tecnología e Innovació