Akademik Veri Yönetim Sistemi
7. ENERJİ VERİMLİLİĞİ KONGRESİ, Kocaeli, Türkiye, 22 Kasım 2025, ss.31-48, (Tam Metin Bildiri)
ABSTRACT
Recent
advancements in internal combustion engine (ICE) technology have led to
significant improvements in brake thermal efficiency. This results in a
reduction in specific fuel consumption and fossil fuel-based greenhouse gas
emissions. Nevertheless, emissions from ICEs remain one of the major
contributors to global warming and environmental degradation. In this context,
Organic Rankine Cycle (ORC)-based exhaust heat recovery technologies present a
promising potential for enhancing the overall energy efficiency of engine
systems while minimizing their environmental impacts. In this study, the
potential of exhaust energy recovery through an ORC system was evaluated using
the GT-SUITE simulation software for an intercity bus operating on the Cruise
Portion of Heavy-Heavy Duty Cycle. The results indicate that ORC-based exhaust
heat recovery systems have great potential to improve the overall thermal
efficiency of the engines, leading to reductions in both fuel consumption and
exhaust emissions. Simulation results show that when the vehicle speed is
approximately 80 km/h during the driving cycle, the exhaust power is
approximately 110 kW. In this case, the energy transferred to the ORC system is
39 kW, and the ORC expander produces 5 kW of power. Simulation results show
that approximately 13% of the exhaust energy can be transferred to the ORC
system. Consequently, the application of ORC systems offers a feasible and
sustainable approach for improving engine brake thermal efficiency and
contributing to global efforts toward decarbonization in the transportation
sector.
Keywords: Organic Rankine Cycle, Exhaust Energy Recovery, Thermal Efficiency, GT-SUITE, Emission Reduction