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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Exergetic analysis of a hybrid solar-biomass powerplant
Submission Author:
Renan Manozzo Galante , PR , Brazil
Co-Authors:
Marcela Alves Domingues, Renan Manozzo Galante
Presenter: Marcela Alves Domingues
doi://10.26678/ABCM.ENCIT2020.CIT20-0484
Abstract
The discussion on the use of renewable sources for power generation has increased on the past decades due to its importance on environmental and economic aspects. This work focus on a hybrid solar-biomass energy configuration, applying two renewable energy sources to maintain a constant supply of electricity without the need of thermal or electrical storage. A model for an operating 28 MW biomass powerplant is developed in conjunction with concentrated solar power (CSP) Fresnel technology under the lenses of an exergetic analysis. This study broadens the comprehension about the diverse hybrid solar biomass configurations compared to the first law of thermodynamics analysis, resulting in new discussions and guidelines. Three configurations of CSP integrated into the powerplant is analyzed considering the northeastern semiarid region of Brazil for implementation. The yearlong simulation resulted in biomass economy from 1.9% to 9.7% and exergetic efficiency drop of 1.6% in the configuration with the higher solar contribution. The higher the solar input, the higher is the system exergetic efficiency drop. While the first law analysis suggests the lower temperature solar field to be the most efficient and the one to be invested, the second law analysis based on exergy suggest the opposite, recommending the higher temperature fields due to its lower exergy destruction.
Keywords
Hybrid powerplant, Solar Energy, Biomass, Linear Fresnel, exergy
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