December 2012
Intermediate to advanced
384 pages
9h 51m
English
book
Distributed Renewable Energies for Off-Grid Communities
by Nasir El Bassam, Preben Maegaard, Marcia Schlichting
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Chapter Seven
Solar Energy
Electromagnetic energy (solar radiation) transmitted by the sun (approximately one billionth of which reaches the earth) is the basis of all terrestrial life. “It amounts to about 420 trillion kilowatt-hours, and is several thousand times greater than all the energy used by all people. Solar energy is harnessed by capturing the sun’s heat (through solar heaters) or light (through photovoltaic cells). It is estimated that one square kilometer (about 0.4 square miles) of land area receives some 4000 kilowatts (4 megawatts) of solar energy every day, enough for the requirements of a medium-sized town” (Business Dictionary 2012).
Solar technologies are broadly characterized as either passive solar or active solar depending ...
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