Research On Energy Efficiency Index And CO₂Emission Baseline Based On Domestic Full-scale Ships

So far, IMO has proposed some technical measures in order to reduce green house gas emission from ships after years of negotiation. The implementation of a mandatory energy efficiency design index(EEDI) for new ships and a voluntary energy efficiency operational indicator(EEOI) for operational ships would be indispensable. Based on numerous full-scale data of different ship type, tonnage and navigation area, the EEDI and EEOI values would be calculated according to the formula. Then, the CO2emission baseline could be obtained by curve fitting. Based on the established baselines, CO2emission from ships would be effectively controlled. However, seeing that there exits no associated research on energy efficiency index and CO2emission from ships in China, the thesis put forward intensive research on energy efficiency index and CO2emission baseline based on domestic full-scale ships.Firstly, the thesis introduces the research progress and current situation in the field of green house gas emission from ships and focuses on intensive analysis of definition, calculation method, verification process and influential factors of EEDI and EEOI.Secondly, due to the lack of research which can reflect the actual energy efficiency level of domestic ships, the quantification assessment on energy efficiency of domestic full-scale ships is achieved. Based on the collected full-scale samples, the EEDI values are calculated, which provides quantification assessment on energy efficiency of domestic full-scale ships. The results show that energy efficiency level of inland ships is lower than that of coastal vessels and energy efficiency level of ocean-going vessels is the highest. Additionally, energy efficiency level of tankers is lower than that of container ships and bulk carriers. The samples of dry cargo ships are so discrete that the established CO2emission baseline can not reflect the actual normal approximation distribution based on domestic full-scale samples. What’s more, the thesis also derivates the calculation formula of energy saving percentage. Through the energy saving assessment, if the established CO2emission baselines are compulsorily implemented as limits, a10%-25%of energy saving percentage would be achieved. The influence of design speed is analyzed and a varying-speed factor based EEDI calculation formula is derivated. According to the calculated results,1kn reduction of speed leads to a12%-20%decrease of EEDI value. Correspondingly,1kn increase of speed leads to a13%-23%rise of EEDI value. For each ship, the EEDI rise percentage is larger than decrease percentage.Finally, due to the indispensability of verification of EEDI and a lack of associated regulations, the thesis comes up with intensive study on verification of EEDI. The method and content of verification is proposed as well as the measurement of parameters. Moreover, to counter the problem of ballast trial speed conversion, a more scientific and more reasonable speed conversion method named geometric admiralty performance coefficient method is put forward. Adopting this method, variation analysis on full-scale verification is carried out. The result shows that there exists varying degrees of variation between theoretical values and full-scale verified values of EEDI under different testing conditions.