Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Modeling a PV/T system using the thermal resistance method
Submission Author:
Amabile Valani Pessoti , ES , Brazil
Co-Authors:
Amabile Valani Pessoti, Arthur Monteiro Filho, Carlos Eduardo Silva Abreu, Rodrigo Fiorotti, Arthur Amorim
Presenter: Amabile Valani Pessoti
doi://10.26678/ABCM.COBEM2023.COB2023-1277
Abstract
The generation of electricity by photovoltaic systems stands out for being derived from a renewable, clean, and silent source. However, there is a negative linear dependence between efficiency and operating temperature due to losses from reflection and heat. In this regard, hybrid photovoltaic/thermal (PV/T) systems are capable of generating electricity like traditional systems while cooling the cells through thermal exchange with a fluid contained in a heat exchanger. By doing so, the efficiency is enhanced both by the increase of the photovoltaic cell’s performance and by the thermal energy use. This work presents a modeling of a PV/T system using the method of thermal resistances, where heat is transferred through diffusion in a steady-state condition, with constant thermal properties and negligible heat losses from the sides. The heat exchanger is made of corrugated polypropylene material with 153 channels of rectangular profile and is installed in a conventional photovoltaic system. The proposed numerical model allows the performance evaluation of a PV/T system in different operational conditions, according to thermal and electrical parameters shown in the literature. The results demonstrated the proportionality between thermal utilization and the temperature of the circulating fluid in the heat exchanger, achieving around 17% and 55% of electrical and thermal efficiencies, respectively, for an irradiance of 1000 W/m2, showing consistency between the modeling and theory.
Keywords
Hybrid solar systems, Solar power generation, solar radiation, Photovoltaic cells, numerical models
