WASTE HEAT RECOVERY IN MARINE DIESEL ENGINES: TRENDS, ARCHITECTURES, AND DESIGN CONSIDERATIONS

Sönmez H. İ., Ünver B., Ekin F.

ASES INTERNATIONAL EUROPEAN SCIENTIFIC RESEARCH CONGRESS, Munich, Almanya, 21 - 23 Haziran 2026, ss.1-20, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Basıldığı Şehir: Munich
  • Basıldığı Ülke: Almanya
  • Sayfa Sayıları: ss.1-20
  • Van Yüzüncü Yıl Üniversitesi Adresli: Evet

Özet

Waste heat recovery in marine diesel engines is increasingly approached as a ship-level integration problem rather than as a narrow bottoming-cycle choice. The central issue is not only how much heat is rejected by the engine, but how the temperature level, exergy content, operating variability, and onboard service demand shape the usefulness of that heat. This study examines the main recovery routes discussed in recent marine-engine literature, including exhaust boilers, single-loop organic Rankine cycle systems, multi-source ORC configurations, supercritical CO2 layouts, and hybrid arrangements that couple power recovery with auxiliary services such as heating, cooling, or desalination. The review shows that exhaust gas remains the most credible source when the objective is direct power or steam generation, while lower-grade streams such as jacket water and charge-air cooling become more attractive when recovery is designed around service matching rather than electrical output alone. The literature also indicates that architecture selection cannot be reduced to peak thermal efficiency. Thermo-economic performance, off-design behavior, retrofit burden, machinery arrangement, controllability, and maintenance implications all materially affect feasibility. Simulation and optimization studies are now extensive, yet long-horizon shipboard validation remains limited. The present evidence therefore supports a design logic based on ship-specific matching rather than on any universally superior recovery cycle. Waste heat recovery is most defensible when recoverable energy quality, service usefulness, integration complexity, and operational robustness are evaluated together within the actual vessel context.