Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
EFFECT OF THE GEOMETRY ON THE PERFORMANCE OF A SMALL-SCALE SOLAR CHIMNEY
Submission Author:
Cristiana Brasil Maia , MG
Co-Authors:
Cristiana Brasil Maia, Janaína de Oliveira Castro Silva
Presenter: Cristiana Brasil Maia
doi://10.26678/ABCM.ENCIT2022.CIT22-0413
Abstract
The world population is increasing, together with an increase in consumption patterns. Conventional energy sources will not be able to fulfill the global energy demand in a few years. Renewable sources play an important role to provide energy, as they are inexhaustible and environmentally friendly. Solar energy is one of the most promising renewable energy sources, considering its technology, improvements, and fast development. Solar chimneys use the incident solar energy to generate a hot airflow, that can be used to generate electricity or to dry agricultural products, and also to produce freshwater. In the design of a solar chimney, it is important to evaluate the influence of the ambient conditions and geometry on its performance. The present work aims to present the effect of the main geometric parameters on the airflow characteristics. The ambient temperature and incident solar radiation were predicted for the city of Belo Horizonte, Brazil, and, based on them, the mass flow rates and the temperatures of the airflow and the ground surface were determined. The heat transfer rates and energy and exergy efficiencies were estimated for the device. The analysis was performed for a 1-h interval, for a whole year, and average values were obtained for different geometries. The influence of the tower diameter and the collector diameter and height can be evaluated. It is expected, based on the literature, to observe that the mass flow rate increases with the tower diameter and height and decreases with the collector height, and also that the tower diameter is the most important design parameter, with greater effect on the performance of the system
Keywords
Solar Chimney, analytical model, modular solar chimney
