It is appropriate to underline that the definitions herein introduced differ from those that several authors adopted on the basis of other nomenclatures. For instance, some prefer to define “secondary energies” those types of energy that allow to transfer energy in space or in time, with a view to make it available wherever and whenever needed. In this framework, the name energy vector is ascribed to this type of function.
KeywordsEnergy System Energy Resource Energy Sector Open Cycle Closed Cycle
- 1.Ippolito F (1976) L’energia: fonti e produzione. Ed. Le Scienze, MilanGoogle Scholar
- 2.Dunn PD (1986) Renewable energies: sources, conversion and application. Peter Peregrinus Ltd., LondonGoogle Scholar
- 3.Makhijani A (1997) Economic and political weekly. BombayGoogle Scholar
- 4.UN (2011) Energy Statistics Yearbook and Energy Statistics Newsletter, United Nations, New York, USAGoogle Scholar
- 5.BP Statistical Review of World Energy (2010) LondonGoogle Scholar
- 6.Key World Energy Statistics (KWES 2010) International Energy Agency, ParisGoogle Scholar