Analisa Performansi dan Komposisi Gas Buang Mesin Diesel dengan Pencampuran Bahan Bakar Etanol dan Bahan Bakar Dexlite secara Tidak Langsung

Abstract

This study aims to analyze the performance and exhaust gas composition of the Daito 178F diesel engine with ethanol and dexlite fuel blending. The research was conducted using an experimental method to evaluate effective power, torque, specific fuel consumption, thermal efficiency, and exhaust emissions for various fuel blend compositions: pure dexlite (DE0), 5% ethanol (DE5), 10% ethanol (DE10), and 15% ethanol (DE15). The results indicate that ethanol has lower viscosity and density compared to dexlite, causing ethanol to deplete faster during combustion. The DE5 fuel blend demonstrated the best performance, achieving the highest effective power of 1373.16 watts, the highest torque of 4.859 Nm, and the highest thermal efficiency of 21.565% at a load of 1600 watts. Conversely, the lowest specific fuel consumption was also recorded for the DE5 blend at 1600 watts, amounting to 395.674 g/kWh. In terms of exhaust gas emissions, the DE15 blend produced the highest CO level at 0.08% and the highest CO2 level at 3.1%, while DE0 achieved the highest O2 emission at 19.06%. The highest hydrocarbon (HC) content was observed in the DE5 blend at 1200 watts with 103 ppm, while the lowest HC content of 0 ppm was recorded under several conditions. This study concludes that blending ethanol with dexlite significantly influences the performance and exhaust emissions of diesel engines. The DE5 blend provides the best balance between performance and exhaust emissions.