Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Efficiency Gain by using a conceptual residential PVT System in the environmental conditions of Rio de Janeiro City.
Submission Author:
Erick Oliveira , RJ
Co-Authors:
Erick Oliveira, Lilian Alves Monte Soares, José Luiz Zanon Zotin, Marcos Curi, Daduí Cordeiro Guerrieri
Presenter: Daduí Cordeiro Guerrieri
doi://10.26678/ABCM.ENCIT2022.CIT22-0554
Abstract
Environmental concerns and the increasing worldwide demand for energy led the scientific community to develop more efficient and sustainable processes. Solar energy has become an important renewable energy source, considering that it could be used in several ways. The photovoltaic panels (PVs) capture solar radiation and generate electricity, but there is an efficiency loss due to the high temperature of the photovoltaic cells. As a solution, heat exchangers can be used to cool down the PVs and increase electrical power generation. The waste heat can be recovered by employing a solar cogeneration system that provides thermal energy to a secondary system. Solar cogeneration systems are defined as photovoltaic thermal solar collectors (PVTs) and the thermal energy generated by them can be used in several residential, commercial, and industrial processes. In the present work, a PV and a PVT system are modeled, simulated, and analyzed considering a residential installation in Brazil weather conditions. Both systems' efficiency results are compared to verify the differences. The cases are tested throughout the year considering a residential water heating system, with solar irradiance, air temperature, and other climate data obtained from National Meteorology Institute (INMET). Preliminary results show a considerable increase in PVT overall efficiency, over 70%, for different solar irradiances. Considering the approval of the new regulatory framework for distributed solar energy in Brazil, which is encouraging the installation of residential photovoltaic systems this year, the use of PVTs could have a huge impact on residential energy consumption. In addition, the water flow rate in the PVT system is presented as an important parameter to be considered in a PVT design, since the electrical and thermal efficiencies tend to increase by increasing the flow rate. However, the higher the flow rate higher the required pumping power, reducing the impact of the recovered wasted energy by the PVT system.
Keywords
PVT, PVT Hybrid System, Solar Energy, Efficiency, Photovoltaic system, Photovoltaic generation
