Evaluation of energy-exergy performance and sustainability index of a DI engine integrated with designed electromechanical EGR cooling system

Kaltakkiran G., Akolas H. I., BAKIRCI K.

ENERGY CONVERSION AND MANAGEMENT, cilt.290, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 290
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.enconman.2023.117229
  • Dergi Adı: ENERGY CONVERSION AND MANAGEMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, CAB Abstracts, Communication Abstracts, Computer & Applied Sciences, Environment Index, INSPEC, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: EGR rate, EGR exhaust gas temperature, Electromechanical EGR cooling system, Energy-exergy balance, Sustainability index, DI engine, EXHAUST-GAS RECIRCULATION, DIESEL, EMISSIONS, TERMS, TEMPERATURE, COMBUSTION, BIODIESEL, BALANCE, BLENDS
  • Atatürk Üniversitesi Adresli: Evet

Özet

Exhaust Gas Recirculation (EGR) system is a commonly used pretreatment technique to improve pollutant emissions from modern diesel engines. Recently, the EGR cooling strategy focuses on improving combustion stability, NOx emission and fuel consumption values by controlling oxygen dilution, in-cylinder and exhaust gas temperatures. However, there are not enough studies focusing on energy and exergy analysis to improve the deterioration caused by hot EGR gas in engine performance and energy distributions. Therefore, in this study, classical and electronically controlled external EGR cooling systems are designed. The present study investigates the effect of the various EGR rates and EGRout gas temperatures on classical/electromechanics EGR cooling systems in a DI diesel engine and reveals the effects of energy-exergy distributions on each other and the sustainability index (SI) perspective. The tests are performed with various EGR rates (5%, 10%, 15%) and EGRout gas temperatures (75 & DEG;C, 90 & DEG;C, 110 & DEG;C) at 1700 and 2000 rpm. At 1700 rpm test conditions, the highest thermalexergetic efficiencies for low and high load are recorded at 15% EGR rate-75 & DEG;C EGRout gas temperature and 5% EGR rate-75 & DEG;C EGRout gas temperature, respectively. At 2000 rpm test conditions, the highest thermalexergetic efficiencies for low and high load are achieved at 15% EGR rate-110 & DEG;C EGRout gas temperature and 5% EGR rate-90 & DEG;C EGRout gas temperature, respectively. The main findings show that the EGR rate rather than the EGRout gas temperature has a more dominant effect on the in-cylinder combustion performance and thermalexergetic efficiency. While the increase in the EGR rate from 5% to 15% contributes positively to the thermalexergetic efficiency and SI performance at low engine load, the opposite is observed at high load. The study recommends that the EGR rate and EGRout gas temperature should be chosen at the optimum level for the engine performance and energy efficiency.