CO₂ emissions during ship building, maintenance, and scrapping are not be involved when defining Energy Efficiency Operational Indicator (EEOI). However, these CO₂ emissions can only show its value during operation phase of ship life. In order to evaluate the effect of CO₂ emissions during ship building, maintenance, and scrapping on energy efficiency, a real time EEOI definition was put forward, a life cycle assessment (LCA) calculation framework was established, and a ship propulsion model with main diesel engine was built. A bulker carrier YUMING was taken as the case ship. CO₂ emissions during ship building, maintenance, and scrapping were calculated. Main engine revolution and real time EEOI value with other parameters were obtained by simulating in different ship draft. The results show that life cycle assessment result will explicitly increase the real time EEOI value especially in lower engine speed and lower ship draft. The engine revolution at the lowest EEOI value will increase explicitly by life cycle assessment result. It means that the lower limit of ship speed should increase during slow steaming. Therefore, slow steaming may bring less environmental benefit if the life cycle assessment result is involved.

定义能源效率操作指标（EEOI）时，不涉及船舶建造，维护和报废期间的CO ₂排放。但是，这些CO ₂排放只能在船舶使用寿命的运营阶段显示其价值。为了评估船舶建造，维护和报废过程中CO ₂排放对能源效率的影响，提出了实时EEOI定义，建立了生命周期评估（LCA）计算框架，并建立了具有主要特征的船舶推进模型。柴油发动机建成。一艘散货船“梦鸣”号被作为案例船。一氧化碳₂计算了造船，维护和报废期间的排放。通过在不同的船舶吃水深度进行仿真，获得了主机转速和实时EEOI值以及其他参数。结果表明，生命周期评估结果将显着提高实时EEOI值，尤其是在较低的发动机转速和较低的船舶吃水深度时。最低EEOI值的发动机转速将根据生命周期评估结果显着增加。这意味着在慢速航行期间应提高船速的下限。因此，如果涉及生命周期评估结果，则慢速蒸煮可能带来的环境效益较小。