Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EXERGO-ENERGETIC ANALYSIS OF A SENSIBLE HEAT STORAGE SYSTEM IN POROUS MEANS
Submission Author:
CAIO CEZAR NEVES , GO , Brazil
Co-Authors:
CAIO CEZAR NEVES, Mario Benjamim Baptista de Siqueira
Presenter: Mario Benjamim Baptista de Siqueira
doi://10.26678/ABCM.COBEM2023.COB2023-1942
Abstract
The possibility of efficiently storing energy in thermal form has been pointed out as a competitive advantage of plants using the Concentrated Solar Power (CSP) technology route compared to photovoltaics. Storage compensates to some extent for the intermittent nature of the solar source and gives flexibility to the operator allowing dispatch at more advantageous times both economically and operationally. There are different storage systems for CSP plants that depend on the technology adopted in the plant. In this work, an exergo-energy study was carried out for a thermal energy storage (TES) system that uses air as heat transfer fluid flowing through a porous medium with optimized geometry for heat transfer. Approximate energy equations for the air and the porous matrix were proposed to enable the study with different configurations of the TES. The aerodynamic parameters of the flow were obtained through simulations in the CFD platform Star-ccm+ that also served to validate the proposed approximations. A numerical model based on the approximated equations was developed. The model discretizes the domain in finite volumes, solving the equations of solid and fluid energy conservation and fluid mass conservation, using the upwind scheme for advective and time implicit term. Simulations of the loading/unloading cycle were performed for the TES of lengths 6m and mass flux in the porous medium of 0.001
Keywords
Thermal load, Thermal discharge, exergy, Heat transfer
