Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
CHARACTERIZATION OF THERMOPHYSICAL PROPERTIES OF PHASE CHANGE MATERIALS FOR THEIR IMPLEMENTATION IN SOLAR THERMAL ENERGY APPLICATIONS
Submission Author:
Jesús David Rhenals Julio , Córdoba , Brazil
Co-Authors:
Jesús David Rhenals Julio, Cristina Isabel Cogollo Torres, Jorge Mario Mendoza Fandiño, Arnold Martinez
Presenter: Cristina Isabel Cogollo Torres
doi://10.26678/ABCM.COBEM2023.COB2023-2229
Abstract
It is essential to characterize phase change materials (PCM) to determine which materials in the market suit their application in thermal energy storage (TES). However, conventional characterization methods can be expensive, requiring specialized equipment and rigorous experimental protocols that demand obtaining thermal equilibrium at low speeds. Thus, in developing this research, we seek to contribute to generating technical and scientific knowledge in the field of PCM through economic characterization methods available in the literature. The methodology was executed by characterizing some PCM available in the country. Their potential for implementation in thermal storage systems is still being determined, as they still need technical sheets showing their thermal properties. T-History and T-Melting (CHF) methods were used to determine the melting point (Tm), fusion enthalpy (Hm), thermal conductivity (K), and specific heat capacity in both solid phase (Cps) and liquid phase (Cpl). The experiments were performed with commercial PCM and validated by comparison using internationally certified RUBITHERM® RT45 and RT55 PCM as references by RAL. Additionally, an analysis of Hm, Cps, and Cpl was carried out in a differential scanning calorimetry (DSC) test to evaluate the standard deviations between the two proposed methods with the results obtained in the DSC the values established in the technical sheets of the international PCM. The results showed that for the T-History method, the error percentages were: Hm: 1.14%, Tm: 3.79%, and Cpl: 16.62%; on the other hand, Cps presented difficulties when estimating due to the complexity of accurately evaluating differences in the area when the reference, environment, and sample have a very close temperature. Regarding the CHF method, the error percentages were: Tmi: 13.45%, Tmf: 1%, Cps: 19.54%, Hm: 2.44%, K: 9.34%, in this case, Cpl was difficult to calculate due to the heat losses present in the test module. The results obtained were consistent and with a low margin of error. It is recommended to use the T-History method to calculate Hm and Cpl and the CHF method to obtain Cps. Of the national PCM evaluated, their thermal properties were determined, achieving a significant contribution to the national state of the art. They showed potential for thermal energy storage compared to other PCM marketed for this purpose.
Keywords
PCM, solar thermal energy, Characrterization, energy, Thermal Storage
