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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
THERMODYNAMIC ANALYSIS OF AN ORGANIC RANKINE CYCLE INTEGRATED WITH LATENT HEAT STORAGE HARNESSING SOLAR THERMAL ENERGY FOR POWER GENERATION
Submission Author:
Daniel Rubano Barretto Turci , RJ , Brazil
Co-Authors:
Daniel Rubano Barretto Turci, Kleber Marques Lisbôa
Presenter: Daniel Rubano Barretto Turci
doi://10.26678/ABCM.ENCIT2022.CIT22-0118
Abstract
This paper aims to investigate the thermodynamic performance yielded by integrating solar collectors with a thermal energy storage system (TES) based on phase change material (PCM), and an organic Rankine cycle (ORC) for power generation. Theoretical calculations employing simplified lumped models for each component are carried out using the Wolfram Mathematica® platform. The so-called direct solar organic Rankine cycle system configuration (DSOS) is considered in this study, in which the ORC working fluid is vaporized directly in the solar collectors, for the associated reduction in the overall irreversibility of the integrated system as compared with the use of an intermediary fluid in the solar collector. R245fa is chosen as working fluid due to its favorable thermophysical properties and environmental-friendly characteristics. Evacuated flat plate collectors (EFPC) are chosen to harvest solar energy and their total area is fixed at 212.4 m². The models and methodologies are verified and validated with theoretical and experimental data, respectively, available in the literature for similar integrated systems. Averaged solar irradiation data taken from the Brazilian National Meteorology Institute (INMET) database for the city of Niterói, Rio de Janeiro, Brazil, is used as input. Performance metrics, such as net power generation, stored energy, and thermal efficiency are analyzed for typical summer and winter weeks of the year. The performance of the integrated system with and without the latent heat storage system are analyzed separately to probe the viability of its use and of the methodology proposed. This study intends to address a major limitation of solar systems, that is, the intermittency of its source, by proposing the use of thermal storage, thereby easing its adoption as a baseload energy source and the phase out of fossil fuels and other harmful alternatives.
Keywords
Solar Energy, energy efficiency, Organic Rankine Cycles (ORCs), Thermal Energy Storage, Phase Change Material (PCM)
