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1 Introduction Based on its high efficiency, the diesel engine is the leading power source for several heavy-duty applications, such as marine installations, electricity produc- tion, on-road trucks and buses, and various off-road machines. Inherently, the high efficiency means low carbon dioxide (CO2) emissions. Still today, one of the global challenges over the whole energy field is to further reduce greenhouse gas emissions to combat climate change, including the reduction of the CO2 emis- sions. This can be achieved by increasing the energy efficiency and energy sav- ings, and by finding renewable options instead of conventional fossil energy sources. In this respect, the diesel engine provides a good starting point with a potential to achieve substantial improvements both in energy efficiency and emis- sions reduction. (FCEP 2010) Within the ongoing large Finnish research program Future Combustion Engine Power Plant (FCEP), one of the work packages concentrates on the energy effi- ciency of internal combustion engines. Technologies related to the improvement of energy efficiency are developed. The engine itself, waste heat recovery (WHR) systems, or power conversion are investigated. This study was part of the FCEP research program and focused particularly on the waste heat recovery systems with a target to find feasible solutions to increase the electricity production of diesel and gas engine driven power plants. At the same time, energy efficiency is improved, decreasing CO2 emissions. Diesel engines, due to their high combustion temperature and pressure, provide an energy conversion technology that is more efficient than any other thermal power device. Especially within the medium-speed range, large diesel and gas engines can reach electrical efficiencies of more than 45%. Nevertheless, the environmen- tal concerns and increasing fuel prices push for continuous improvement in the energy efficiency. The WHR systems are seen as one of the most promising tech- nologies to improve the efficiency of current diesel and gas engine installations significantly. The aim of this study was to search for and find thermodynamic processes and power conversion methods which could be applied as a WHR system in combina- tion with diesel and gas engines to produce additional electrical power from the excess heat. Below, these processes and methods are briefly described and their practical potential is discussed. The study is mainly based on literature data col- lected in the University of Vaasa.PDF Image | Waste Heat Recovery Bottoming Cycle Alternatives
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