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Effect analysis on energy efficiency enhancement of controlled cylinder liner temperatures in marine diesel engines with model based approach

机译：基于模型方法的船用柴油机控制气缸衬套温度能效增强效果分析

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In recent years, growing interest in engine efficiency, because of international regulations in the maritime sector, necessitates studies about new operational techniques. Ships have been operating at reduced speeds in recent years and, the liner temperatures of marine diesel engines vary significantly at reduced loads, which increase the heat loss from main engine. The research focuses on revealing the energy efficiency enhancement potential by decreasing heat loss through jacket water during reduced loads without any permanent modification. The heat loss reduction is achieved by means of higher coolant (glycol-water mixture) temperatures, to keep the liner temperatures at their maximum permissible temperatures. The methodology is calculating the energy balance and efficiency increment at reduced loads of main engine by modelling. The model have been validated with the digital twin of a two-stroke Sulzer-12RTA84C marine diesel engine. The simulated results comprise in-cylinder pressures, exhaust gas temperature and pressure, scavenge pressure, engine speed, turbo-charger, indicated power and heat transfer rate. Liner temperatures, affecting the heat transfer rate, are investigated in variable operating loads of the main engine. The study shows that keeping the liner temperature of the engine at the maximum continuous rating's temperature, has respectable efficiency advantages under different operating loads. 0.5% reduction in fuel consumption could be achieved, coming with 127.8 tons fuel and 398 tons CO2 reduction in a year. Additionally, waste heat recovery system calculations were carried out and additional 48.8 tons of fuel could be saved in the generation of electricity. In total 176.6 tons of fuel and 550 tons of CO2 emission reduction could be achieved. As a result, the controlled cylinder wall temperatures can be considered as one of the methods to solve the efficiency and emission problems in ships in the near future.
机译：近年来，由于海事部门的国际法规，对发动机效率的兴趣日益增长，需要研究新的操作技术。船舶近年来一直在减少速度运行，并且船用柴油发动机的衬里温度在减少的载荷下显着变化，这增加了主发动机的热量损失。该研究侧重于通过在没有任何永久性修改的情况下通过夹克水降低通过夹克水的热量损失来揭示能量效率提高潜力。通过更高的冷却剂（二醇 - 水混合物）温度来实现热损失减少，以使衬里温度保持在其最大允许温度下。该方法通过建模计算了主发动机减少的能量平衡和效率增量。该模型已用双程Sulzer-12RTA84C船用柴油发动机的数字双胞胎验证。模拟结果包括缸内压力，废气温度和压力，清除压力，发动机速度，涡轮充电器，指示的功率和传热速率。在主发动机的可变操作负载中研究了影响传热速率的衬里温度。该研究表明，将发动机的衬垫温度保持在最大连续额定值的温度下，在不同的操作负荷下具有可观的效率优势。可以实现燃料消耗的0.5％，燃料减少，燃料127.8吨，每年减少398吨二氧化碳。此外，进行了废物热回收系统计算，并额外48.8吨燃料可以节省电力。总共176.6吨燃料，可以实现550吨二氧化碳排放减少。结果，受控的圆筒壁温度可以被认为是在不久的将来解决船舶效率和排放问题的方法之一。

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