Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Experimental analysis of an absorption refrigeration cycle run by thermal energy released in an internal combustion engine operating with ethanol
Submission Author:
Cristiana Brasil Maia , MG
Co-Authors:
Cristiana Brasil Maia, Guilherme Loyola França de Vasconcellos, Sergio Hanriot
Presenter: Cristiana Brasil Maia
doi://10.26678/ABCM.COBEM2023.COB2023-0249
Abstract
This paper presents an experimental analysis of an absorption refrigeration cycle operated using thermal energy released in a Diesel/Otto internal combustion engine. The engine was fueled with ethanol, and various power levels delivered by the system were examined. Charge and discharge cycles were evaluated, and parameters such as exhaustion gases temperature, mass flow rate, and fuel consumption were assessed for different power values. It was observed that the mass flow rate increased with the power delivered by the engine, consistent with the literature. Measurements were taken for emissions of CO, CO2, O2, and NOx, while emissions of H2, H2O, and N2 were indirectly determined. The results indicated that the air/fuel ratio influenced the emissions. In general, it was observed a reduced amount of CO2 and O2 and an increase in the amount of CO in the exhaustion gases. For a fixed power level, temperatures at the generator, rectifier, condenser, and evaporator inlets and outlets were measured over a specified period. The cycle powered by exhaust gases took longer to start operating compared to the cycle operating with GLP. The temperature at the condenser inlet was lower for the cycle operating with ethanol in the engine, and higher temperature gradients were observed along the condenser. Higher temperatures were found at the evaporator inlet. Finally, considering the measured temperatures, the coefficient of performance (COP) was evaluated, with a maximum COP of 0.053 being obtained.
Keywords
absorption refrigeration cycle, COP, MCI, ethanol
