Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
FLAT PLATE SOLAR COLLECTOR PERFORMANCE INVESTIGATION BASED ON PLATE EMISSIVITY AND SLOPE ANGLE
Submission Author:
Lucas Rodrigues Neumann , MG
Co-Authors:
Lucas Rodrigues Neumann, Fernanda Machado, Felipe Raul Ponce Arrieta, Cristiana Brasil Maia
Presenter: Lucas Rodrigues Neumann
doi://10.26678/ABCM.COBEM2021.COB2021-0984
Abstract
Abstract. The efficiency of a flat plate solar collector may show significant variations due to its manufacturing and operating mode, where slope and absorbing plate surface characteristics are some of the key factors that might directly affect the collector´s performance. This paper investigates the influence of both absorbing plate emissivity and collector slope angle in the performance of a flat plate solar collector. A mathematical model has been developed through SCILAB, on which the incident beam radiation, absorbed radiation, useful heat and overall efficiency have been analyzed in a daily basis throughout the year, using the collector geometry and ambient temperature as input data. Incident beam radiation has been estimated using the isotropic sky model, which considers the clearness index in the typical meteorological year. The model has been applied to the city of Belo Horizonte, Brazil (latitude19.93ºS and longitude 43.95ºW) but can also be used for any other location by only changing the clearness index and the ambient temperature. The obtained results cover a full year of operation in Belo Horizonte. It is expected to obtain an efficiency increase by utilizing a selective surface and defining an appropriate collector slope angle in a monthly basis. The obtained results will be compared with the recommended ones in the literature, in which the optimum collector slope angle must be the location latitude increased by 10º for the summer and decreased by 10º for the winter.
Keywords
Flat Plate Solar Collector, slope angle, selective surface, collector´s efficiency
