Akademik Veri Yönetim Sistemi
15th International EXERGY, ENERGY AND ENVIRONMENT SYMPOSIUM (IEEES-15), İstanbul, Türkiye, 19 Aralık 2024 - 21 Mart 2025, sa.35, ss.122-126
Internal combustion engines are heat engines that convert the chemical energy of the fuel they use into mechanical energy. However, during the energy conversion process, a significant portion of the fuel's energy must be expelled into the environment through the exhaust and cooling systems. Since the invention of engines, minimizing this energy loss and increasing the thermal efficiency of engines has been an important research area. Moreover, the recent sensitivity regarding global warming has placed significant pressure on manufacturers to increase thermal efficiency, thereby reducing specific fuel consumption and greenhouse gas emissions. In this context, the potential for increasing thermal efficiency was examined by analyzing the energy and exergy losses of a modern 2.0-liter EURO6 diesel engine, commonly used in passenger and freight transport. The analysis results have shown that this engine can achieve thermal efficiency above 40% when operating in the 1500-2000 rpm range at the target load of 270 Nm. During this period, both exhaust and cooling system losses remain between approximately 20% and 30%. The exergy analysis has revealed that while the exergy lost to the environment through the cooling system remains below 2% at the target load of 270 Nm and varying speeds, the exergy lost through the exhaust ranges between 27% and 44%.