Study Of The Control Of GHG Eemission From Ships By Reducing Sailing Speed

This thesis introduces various methods of reducing greenhouse gas (GHG) emissions from ships, and focuses on the feasibility and cost/benefit of the emission debasement achieved by slowing down sailing speed of ships.The slowing down of sailing speed leads to a reduction of fuel cost and a reduction of the freight income, their difference makes up the cost of GHG emission reduction.For the effectiveness in reducing emissions, low speed can definitely reduce the emission of a single ship. But the transportation demand will turn to other transport tool if their demand can't be met and will increase the total emission. To avoid this kind of increase, the original transportation capacity must be kept and more vessels must be used, but this will lead to extra emission of GHG Actually, although the overall number of the fleet increases, the GHG emission caused by the goods transport will decrease because of the reduction of the average ton-mile emission.Taking the materials and energy consumption of the ship construction in to consideration, the total GHG emission will be higher than the direct emissions during sailing. By given certain conditions, a mathematical model is established and the mitigation possibility and potential is analyzed.A vessel with different type and different age has different shipping cost constitute, service speed and different voyage distance. In this thesis, the impacts of above mentioned factors are mathematically analyzed.