Energy efficiency analysis of pump systems in a ship power plant and a case study of a container ship

Energy efficiency can be defined as the reduction of energy consumption per unit of service or product quantity that without causing a decline in the quantity and quality of production which the standard of living of the people and service quality, and industrial enterprises. In the other hand an energy efficiency is prevent energy losses in the gas, steam, heat, air and electricity; or to reduce the demand for energy without reducing the production recovery and evaluation or advanced technology of various waste, more efficient energy sources, advanced industrial processes, activities such as energy recovery is the whole of the building measures. It is well known that the most of the electricity energy is consumed by the pump for applications at the buildings, industry and transportation. A research study, among the consume energy machinery, have illustrated that pumps are used the energy in 20%. Due to that pumps and pump systems have a great importance in term of energy efficiency in the different sectors. There are many type of pumps and pump systems for different purposes in ships. They are often worked at full load in cruising, maneuvering and hotelling conditions. Therefore unnecessary energy consumption is realized. It is demonstrated that some simple measures or some minor changes can be saved energy between 20% and 30% in the industrial application from the pump systems. Accordingly, it may be mentioned from such a large energy savings potential from the ships. In this paper, the energy consumption of pumping system of a container ship at the full ahead, half ahead and slow ahead situations are calculated. The pumping system's energy saving improvements and its effect to ship's annual energy consumption are calculated for the same ship, and the economic gain and efficiency increases are discussed.