Research Information System
20TH INTERNATIONAL ISTANBUL SCIENTIFIC RESEARCH CONGRESS ON LIFE, ENGINEERING, ARCHITECTURE AND MATHEMATICAL SCIENCES, İstanbul, Turkey, 21 - 23 February 2025, pp.473, (Summary Text)
ABSTRACT
The enhanced thermal efficiency exhibited by modern internal combustion engines has facilitated a significant reduction in specific fuel consumption, thereby minimizing the emissions that are contributing to global warming. However, emissions from internal combustion engines are still one of the most important sources contributing to global warming. On the other hand, recent technological advances in exhaust gas energy recovery by Organic Rankin Cycle (ORC) offer important new opportunities to further improve the thermal efficiency of internal combustion engines and reduce their contribution to global warming. In this study, the exhaust energy recovery potential of a 2-litre diesel engine with ORC is investigated in GT-SUITE simulation program. Simulations were carried out at 2 different exhaust mass flow rates and 4 different exhaust inlet temperatures. The simulation results indicate that the energy input to the evaporator in the designed ORC system increases linearly with both exhaust temperature and mass flow rate, but the energy input can be much higher with increasing exhaust temperature. When the exhaust mass flow rate is 0.15 kg/s, the energy input to the evaporator is approximately 15 kW at 200°C and increases to 30 kW when the temperature is 350°C. When the mass flow rate is 0.2 kg/s, the energy input to the evaporator increases from 18 kW at 200°C to 35 kW at 350°C. The mechanical power generated in the ORC system increases from 0.9 kW at 200°C to 2.7 kW at 350°C for a mass f low rate of 0.15 kg/s. When the mass flow rate is 0.2 kg/s, the power generated increases from 1.2 kW at 200°C to 3.2 kW at 350°C. In addition, the energy conversion efficiency increases significantly with exhaust temperature, but the increase is not linear. The ORC system thermal efficiency reaches 5% at 350°C for a mass flow rate of 0.15 kg/s. In conclusion, ORC-based exhaust energy recovery offers a viable solution to reduce fuel consumption and emissions by improving engine thermal efficiency.
Keywords: Exhaust Energy Recovery, Organic Rankine Cycle, IC Engines