İKİ LİTRE HACİMLİ BİR DİZEL MOTORDA ORGANİK RANKİNE ÇEVRİMİ UYGULAMASININ AVANTAJLARININ İNCELENMESİ
Tez Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Kocaeli Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği, Türkiye
Tez Danışmanı: Şeref Soylu
Tezin Onay Tarihi: 2025
Tezin Dili: Türkçe
Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
Özet:
EXAMINATION OF THE ADVANTAGES OF APPLYING THE ORGANIC RANKINE CYCLE IN A TWO-LITER DIESEL ENGINE
ABSTRACT
Advances in the thermal efficiency of modern
internal combustion engines have led to a significant reduction in specific
fuel consumption, thereby significantly reducing greenhouse gas emissions from
fossil fuels that contribute to global warming. However, despite this,
emissions from internal combustion engines remain one of the most significant
sources contributing to global warming today. On the other hand, technological
advancements in exhaust gas energy recovery using the Organic Rankine Cycle
(ORC) offer important new opportunities to reduce contributions to global
warming by improving thermal efficiency. In this study, the exhaust energy
recovery potential of a 2-liter diesel engine using ORC was investigated using
the GT-SUITE simulation program. Simulations were conducted at five different
exhaust mass flow rates and four different exhaust inlet temperatures. The
simulation results showed that approximately 50% of the exhaust energy could be
transferred to the ORC system, and that the energy input to the evaporator in
the designed ORC system increased with both exhaust gas 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.
Meanwhile, the mechanical power produced in the ORÇ system increases from 1.2
kW at 200°C to 3.2 kW at 350°C.
Additionally, energy conversion efficiency increases significantly with
exhaust temperature, though the increase is not linear. Under these conditions,
the conversion of exhaust thermal energy into mechanical energy via the ORÇ
system reaches a maximum of 5%. In conclusion, ORÇ-based exhaust energy
recovery offers a viable solution for reducing fuel consumption and emissions
by improving engine thermal efficiency. Since carbon dioxide emissions are
directly related to the vehicle's fuel consumption, fuel savings also lead to a
reduction in carbon dioxide emissions, the primary greenhouse gas.
Keywords:
Exhaust Energy Recovery, Internal
Combustion Engines, Organic Rankine Cycle.