Investigação experimental do desempenho térmico de um sistema de coletores solares de tubos evacuados assistidos por termossifões

Abstract

Against of the growing industrial and population development, the demand for energy generation is constantly increasing. Solar thermal systems emerge as a promising solution to address these challenges, harnessing the sun as an inexhaustible heat source with high development potential. Evacuated tube solar collectors, which use solar irradiance and are assisted by thermosyphons to heat the working fluid, demonstrate great efficiency. Water heating in residential applications through these solar collectors can considerably reduce energy consumption. In addition to being sustainable, high pressure evacuated tube solar collectors can be economically advantageous. Compared to conventional solar collectors, thermosyphon-assisted solar collectors are more efficient and operate at higher temperatures. This Completion of Course Work aims to evaluate the thermal performance of a system of three evacuated tube solar collectors assisted by thermosyphons, using water as the working fluid. Experimental tests were conducted over a day in the spring of 2023 in the city of Ponta Grossa, state of Paraná, South Region of Brazil. Through the First Law of Thermodynamics, it was observed that the thermal efficiency of both the individually analyzed solar collectors and the system ranged between 59 and 85% under real weather conditions. The results indicate that a system of evacuated tube solar collectors assisted by thermosyphons can be a viable and sustainable alternative for water heating.