Fabio Orecchini is a professor of energy systems at Guglielmo Marconi University and Sapienza University of Rome, Italy. He is the founder and co-ordinator of GEA - Energy and Environment Group and GRA – Automotive Research Group at CIRPS - Interuniversity Research Centre for Sustainable Development, Sapienza University of Rome, Italy. He is also the Director of the Department of Energy and Mechanics of Guglielmo Marconi University and the scientific co-ordinator of national and international research consortiums in the field of sustainable energy systems for mobility and stationary uses.Professor Orecchini is also Chairman of the international scientific committee of HySyDays, a world congress of young scientists working in the area of hydrogen energy systems, and founder and chairman of the scientific committee of H2Roma – energy&mobility show, an annual event held in Rome, Italy, with the largest automotive manufacturers and energy companies (BMW, Enel, Fiat, Ford, General Motors, Honda, Mercedes-Benz, Smart, Mitsubishi, Nissan, Porsche, PSA Peugeot Citroen, Toyota, Lexus, Volkswagen and Volvo), which has the ultimate aim of achieving "zero consumption, zero emission" cars and energy systems. He is the scientific responsible person of the “Innovation technologies” exhibition area within the Bologna Motor Show – Italian International Auto Show, held yearly in Bologna, Italy.Together with Professor Vincenzo Naso, he has authored the book La società No Oil (No Oil Society), in Italian (2003, second edition 2006). He is also the author of original research and scientific papers in the fields of energy systems for sustainable development, high efficiency energy conversion systems, automotive and mobility engineering, renewable energies, and hydrogen energy technologies. He is a creator and promoter of the energy vectors approach for the design of energy systems, as discussed in this book.Vincenzo Naso is aprofessor of energy conversion systems at the Department of Mechanical and Aerospace Engineering of the Sapienza University of Rome, Italy. He is the Director of CIRPS - Interuniversity Research Centre for Sustainable Development, Sapienza University of Rome, Italy, President of CIRPS Consortium, R&D and D Agency and past president of ISES Italia, Italian Branch of the International Solar Energy Society (ISES). He is also President of postgraduate Master's courses (EFER – energy efficiency and renewable energy sources, and MEA – energy and environmental management) at Sapienza University of Rome.Professor Naso is the scientific co-ordinator of national and international research consortiums in the field of renewable energy and sustainable energy systems.Together with Professor Fabio Orecchini, he has authored the book La società No Oil (No Oil Society), in Italian (2003, second edition 2006). He is also the author of original research and scientific papers in the fields of renewable energy, energy efficiency, Stirling engine, hydrogen energy technologies, and energy management. He is a creator and promoter of the energy efficiency approach for the design of energy systems that is explained and discussed in this book.He is member of the International Committee of the Network of Networks of Universities implementing sustainability science, and Chairman of the 2010 International Conference on Sustainability Science (ICSS).

• 1. Energy Systems.- 2. Energy Resources.- 3. Energy Vectors.- 4. Energy Conversion and Transformation Plants.- 5. Distributed Generation and Cogeneration.- 6. Energy Useful Effect End Use.

Fabio Orecchini is a professor of energy systems at Guglielmo Marconi University and Sapienza University of Rome, Italy. He is the founder and co-ordinator of GEA - Energy and Environment Group and GRA – Automotive Research Group at CIRPS - Interuniversity Research Centre for Sustainable Development, Sapienza University of Rome, Italy. He is also the Director of the Department of Energy and Mechanics of Guglielmo Marconi University and the scientific co-ordinator of national and international research consortiums in the field of sustainable energy systems for mobility and stationary uses.Professor Orecchini is also Chairman of the international scientific committee of HySyDays, a world congress of young scientists working in the area of hydrogen energy systems, and founder and chairman of the scientific committee of H2Roma – energy&mobility show, an annual event held in Rome, Italy, with the largest automotive manufacturers and energy companies (BMW, Enel, Fiat, Ford, General Motors, Honda, Mercedes-Benz, Smart, Mitsubishi, Nissan, Porsche, PSA Peugeot Citroen, Toyota, Lexus, Volkswagen and Volvo), which has the ultimate aim of achieving "zero consumption, zero emission" cars and energy systems. He is the scientific responsible person of the “Innovation technologies” exhibition area within the Bologna Motor Show – Italian International Auto Show, held yearly in Bologna, Italy.Together with Professor Vincenzo Naso, he has authored the book La società No Oil (No Oil Society), in Italian (2003, second edition 2006). He is also the author of original research and scientific papers in the fields of energy systems for sustainable development, high efficiency energy conversion systems, automotive and mobility engineering, renewable energies, and hydrogen energy technologies. He is a creator and promoter of the energy vectors approach for the design of energy systems, as discussed in this book.Vincenzo Naso is aprofessor of energy conversion systems at the Department of Mechanical and Aerospace Engineering of the Sapienza University of Rome, Italy. He is the Director of CIRPS - Interuniversity Research Centre for Sustainable Development, Sapienza University of Rome, Italy, President of CIRPS Consortium, R&D and D Agency and past president of ISES Italia, Italian Branch of the International Solar Energy Society (ISES). He is also President of postgraduate Master's courses (EFER – energy efficiency and renewable energy sources, and MEA – energy and environmental management) at Sapienza University of Rome.Professor Naso is the scientific co-ordinator of national and international research consortiums in the field of renewable energy and sustainable energy systems.Together with Professor Fabio Orecchini, he has authored the book La società No Oil (No Oil Society), in Italian (2003, second edition 2006). He is also the author of original research and scientific papers in the fields of renewable energy, energy efficiency, Stirling engine, hydrogen energy technologies, and energy management. He is a creator and promoter of the energy efficiency approach for the design of energy systems that is explained and discussed in this book.He is member of the International Committee of the Network of Networks of Universities implementing sustainability science, and Chairman of the 2010 International Conference on Sustainability Science (ICSS).

• 1. Energy Systems.- 2. Energy Resources.- 3. Energy Vectors.- 4. Energy Conversion and Transformation Plants.- 5. Distributed Generation and Cogeneration.- 6. Energy Useful Effect End Use.