Chapter 2
Renewable Energy Sources
As mentioned in Chapter 1, Introduction to Energy Systems, renewable energy systems (RESs) harness the energy that is being continuously supplied by the sun, transforming it into useful energy carriers to serve the needs of humankind.1 As an ultimate energy source, the sun is infinite and inexhaustible for all practical purposes; any fraction of primary energy converted to the energy carriers is continuously replenished, giving the energy system its renewable character.
1. It should be noted that the ultimate source of all energy utilized on the earth, including the fossil and nuclear sources, is the sun. However, these sources are one-time creations (on the geologic time scale) and lack the renewability feature. ...
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