Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
NIGHT COOLING POTENTIAL OF PV-T COLLECTORS FOR BRAZILIAN CITIES
Submission Author:
Victor César Pigozzo Filho , SC
Co-Authors:
Alexander Leyton Mopan, Victor César Pigozzo Filho, Bruna de Oliveira Busson, Matheus Buss, loic tachon, Henrique Hipólito, Felipe Cardim de Araújo, Júlio Passos, Mateus Gabiatti
Presenter: Alexander Leyton Mopan
doi://10.26678/ABCM.COBEM2021.COB2021-0237
Abstract
Renewable energy is a major issue in modern society. High energy consumption for ambient cooling is among the challenges of renewable energy generation. In this scenario, a model of a PV-T solar collector was simulated in Trnsys to evaluate the night radiative cooling potential for different Brazilian cities during spring and summer seasons. This technology achieves the higher potential operating as a trigeneration system, so, during the day the PV-T panels operate to generate electricity and hot water. During the night the panels operate to generate cold water by exchanging heat with the sky by radiation. The studied system is made of three panels with a total area of 3.9 m2, with a nominal electric power of 585 W. This paper studies the influence of the PV-T parameters, like tilt angle of the panels, flow rate and temperature of the supply water, and climate characteristics in the radiative cooling potential. The system was simulated for the following cities: Florianópolis, Recife, São Paulo, Porto Alegre, Belo Horizonte, Manaus, Salvador and Brasília. In this way it was possible to compare the equatorial, littoral, tropical and subtropical regions. Simulation results show a better potential for radiative cooling in tropical region ranging from 19 W/m2 to 98 W/m2. Depending on the flow rate and other parameters, the water temperature obtained was up to 5.3°C below ambient temperature. The sky temperature and its difference with the ambient temperature were identified as an important parameter in the cooling potential. Another determining factor is the amount of time of clear sky, since the atmosphere is almost transparent to the infrared radiation emitted and not being transparent in the presence of clouds. The results show that this cooling technology has a good potential to be used in trigeneration systems. Preliminary experimental data from other studies was used to validate the results of the simulated model.
Keywords
pv-t solar collectors, radiative cooling, annual simulation
