Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
EXERGETIC ANALYSIS OF FLAT-PLATE PHOTOVOLTAIC/THERMAL SOLAR COLLECTORS COMBINED WITH A LOW-TEMPERATURE LIBR/H2O ABSORPTION REFRIGERATION CYCLE
Submission Author:
Clara Reis Pinto , SP
Co-Authors:
Clara Reis Pinto, Carlos Eduardo Keutenedjian Mady
Presenter: Clara Reis Pinto
doi://10.26678/ABCM.ENCIT2018.CIT18-0583
Abstract
In this work, the application of hybrid flat plate photovoltaic/thermal (PV/T) solar collectors coupled to a low-temperature indirect-fired single-effect LiBr/H2O absorption refrigeration chiller as a solar cogeneration system is discussed. Its main purpose is to provide auxiliary air conditioning in order to lessen electricity costs associated with thermal comfort for residences in warm climates. Moreover, the hybridization of the solar collectors increases the PV module efficiency and can decrease the total area needed for the installation of PV modules and solar flat plate collectors for use in distributed generation, especially on residential rooftops. A thermal circuit model is used to simulate heat transfer through the PV/T collector. This study describes the performance of the absorption refrigeration system, its constraints due to the lower temperatures achieved with the flat plate PV/T collectors and the increase in the PV module electric conversion efficiency due to their cooling through heat transfer to the thermal cycle, which is especially high during the sunny season in Brazil, with high rates of solar radiation. An exergy analysis is applied to the system under steady state conditions and its total efficiency and electrical power output and savings are evaluated and compared to a simple PV/T cogeneration system with hot water production and a standard vapor compression refrigeration cycle with the same thermal load removal for air conditioning.
Keywords
solar cogeneration, solar thermal, Solar Photovoltaic, PV/T, Absorption refrigeration, LiBr-H2O
