Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
PERFORMANCE ASSESSMENT OF A LARGE INTERNAL COMBUSTION ENGINE DUE TO INLET AIR COOLING AND DEHUMIDIFICATION: A SIMULATION USING GT-POWER SOFTWARE
Submission Author:
Israel Campbell , ES
Co-Authors:
Israel Campbell, Andre Chun, Bruno Muniz de Freitas Miotto, José Joaquim Conceição Soares Santos, João L M Donatelli, Carla César Martins Cunha
Presenter: Israel Campbell
doi://10.26678/ABCM.ENCIT2020.CIT20-0777
Abstract
Large internal combustion engines (ICEs) are limited by knocking phenomenon due harsh ambient conditions such as hot temperature and excessive humidity. The performance of these engines can be enhanced by cooling and dehumidifying the inlet air on turbocharger upstream under safe operation conditions through a cooling coil heat exchanger, hence, increasing the power output as well as reducing the brake specific fuel consumption and pollutant specific emissions. Analysis have been performed in the GT-Power software through a 1-D thermodynamic modelling of the Wärtsilä W20V34SG engine, making it possible to verify the influence of the ambient temperature in a range of 15.5°C to 9.5°C, while keeping 1 bar and relative humidity of 100%. Furthermore, the brake mean effective pressure (BMEP) has been set from 20 bar to 23.45 bar with a step of 1.15 bar. Such simulations are aimed to find the maximum air temperature at the cooling coil outlet in which the average of maximum cylinder pressures does not exceed the safety limit pressure of 186 bar while maintaining control on the wastegate valve. As a result, it was possible to evaluate that the maximum temperature to be chosen, under the conditions already mentioned, should be lower than 13°C.
Keywords
Internal combustion engine, intake air conditioning, 1-D thermodynamic modelling, Engine Performance
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