Avaliação do Desempenho Térmico de Cobertura Fotovoltaica com Filme OPV

Abstract

This study evaluated the thermal performance of three roof prototypes under a humid subtropical climate (Cascavel–PR): Prototype A (polycarbonate, EPS, and steel), Prototype B (same configuration with OPV film), and Prototype C (metal sandwich panel). The prototypes were installed in an open area on the UNIOESTE campus and instrumented with sensors for internal and external air temperature, radiant temperature, and solar radiation. Data were recorded at one-minute intervals over 30 days (September 5 to October 5, 2025), processed using a Hampel filter, and analyzed for the daytime period between 08:00 and 18:00. Thermal indicators were calculated to compare system performance, including internal–external temperature differences, thermal amplitudes, damping factor, time lags between radiation and internal temperature peaks, maximum heating and cooling rates, and mean radiant and operative temperatures. The results showed lower thermal amplitudes in Prototype A and intermediate behavior in Prototype B. The OPV film reduced thermal oscillations compared to Prototype C but maintained higher average internal temperatures. Since conductive heat transfer differences were minimal, the observed contrasts are mainly attributed to optical–radiative effects. It is concluded that, under the tested configuration, OPV acts as a partial thermal barrier, attenuating short-term thermal variations without reducing the average internal thermal load.