EVALUATION OF THE BOUNDARY CONDITIONS FOR THE GROUND IN THE NUMERICAL ANALYSIS OF A SOLAR CHIMNEY
Paulo Fonsêcà Marinho Júnior1; Tauane Shaisly Fernandes1; Janaína de Oliveira Castro Silva1; Sérgio de Morais Hanriot1; Cristiana Brasil Maia1
1 Pontifícia Universidade Católica de Minas Gerais
doi:10.20906/CPS/COB-2015-0641
Resumo
A solar chimney is a renewable-energy, combining three essential elements - solar air collector, chimney, and wind turbine. The airflow generated is typically used to drive wind turbines. In small solar chimneys, the power generated is not economically competitive; therefore, the airflow can be used to other purposes, such as drying of agricultural products. In this paper a numerical analysis of the airflow inside a small solar chimney is performed, using CFD techniques. The main focus of the paper is the assessment of the boundary conditions used for the ground, and the influence of the use of the soil as an energy storage layer and how it affects the airflow parameters. The results are compared with experimental data from the literature. The results show that the use of energy storage layer has greater influence on the distribution of temperatures than about the velocity distribution and that yours absence underestimates the heat losses. So their use is essential for consistent description of the flow behavior within the solar chimney.
Palavras-chave: Solar chimney; Numerical analysis; Boundary conditions; Ansys-CFX