Mathematical Modeling of a Novel Marine Diesel Engine Cooling System with Seawater Integration and Steam Injection for Performance Enhancement
نویسندگان
1 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
2 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
3 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
4 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
doi
10.30492/ijcce.2025.2070364.7274چکیده
Marine diesel engines suffer from thermal inefficiency and corrosion in conventional seawater-cooled systems. This study introduces a novel hybrid cooling system integrating direct seawater mixing (via RO-purified water) with exhaust-steam injection to enhance turbocharging and eliminate large heat exchangers. Objectives: Achieve 5–7% improvement in power, efficiency, and BSFC. Methodology: Steady-state energy and mass balances solved in EES; key parameters (m˙hot, ΔT, η) optimized for an 800 hp (596.56 kW) engine. Key assumptions: Ideal gas exhaust-steam mixture, RO yield = 50%, auxiliary power = 25–40 kW. Results: Net power increases to 616–626 kW (3–5%), BTE to 42.6% (+5.2%), BSFC to 190–192 g/kWh (-4–5%). Steam injection boosts turbine work by 28–32%; seawater mixing contributes 10–15 kW cooling. Sensitivity Conclusions: The system offers a simple, scalable, low-maintenance alternative to ORC/turbo-compound, with 12–22% NOx reduction and 10–15% CO2 savings, supporting IMO 2050 targets.
