FRESENIUS ENVIRONMENTAL BULLETIN, vol.25, no.7, pp.2261-2268, 2016 (SCI-Expanded)
Waste heat recovery has attracted attention throughout the world because of the greenhouse effect by fossil fuels, their depletion, and safety of energy demand. It is also considered as a free source of energy requirements. For this purpose, various methods have been developed and implemented in order to recover energy from waste heat in industrial power plants in recent years. Marine power plants use fossil fuels to meet a major amount of their energy requirements. Therefore, this leads to not only increase energy production costs and environmental pollution but also decrease ship energy efficiency. Therefore, environmental friendly methods need to be preferred by increasing the ship energy efficiency and decreasing energy production costs. In this study, waste heat recovery methods have been investigated and their effects on ship energy efficiency and environmental pollution have been analyzed. A novel concept has been definite which is called specific emissions ratio (SER) for a waste heat recovery system. SER can be indicated a decreasing of emissions rate of a waste heat recovery plants. It is shown in the results that the value of SER for CO2 gas component is 3.51 t(kW year)(-1) in the application without waste heat recovery whereas the same value goes down to 3.29 t(kW year)(-1) with the application of waste heat recovery. This system leads to the saving of 0.22 tons of fuel per unit kW power.