Research Information System
6. INTERNATIONAL TRAKYA SCIENTIFIC RESEARCH CONGRESS 05-06 APRIL 2025 EDİRNE, Edirne, Turkey, 5 - 06 April 2025, pp.648-661, (Full Text)
ABSTRACT
The improvement in the thermal efficiency of modern
internal combustion engines (ICE) has facilitated a significant reduction in
specific fuel consumption, thereby minimizing emissions that cause global
warming. However, emissions from ICE are one of the most important sources of
increasing global warming. On the other hand, technological advances in exhaust
gas energy recovery with the Organic Rankine Cycle (ORC) offer important new
opportunities to reduce the contribution to global warming by improving thermal
efficiency of ICE. In this study, the exhaust energy recovery potential of a
2-liter diesel engine with an ORC is investigated in GT-SUITE simulation
program. Simulations were performed at 5 different exhaust mass flow rates and
4 different exhaust temperatures. The simulation results show that
approximately 50% of the exhaust energy can be transferred to the ORC system
and the energy input to the evaporator in the designed ORC system increases
linearly with both exhaust temperature and mass flow rate. For example, when
the exhaust 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. At the same time, the
mechanical power generated in the ORC system 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 thermal efficiency of the ORC system reaches a
maximum of 5% under these conditions. 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