The sun is the source of all energy on earth; although some places are sunnier than others, solar radiation is abundant and ubiquitous, so its potential should always be taken into account. The sun can be reaped everywhere, but its precise yield is strongly dependent on the latitude, season and local obstructions such as building, green and pollution in the air. Figure 6.10 gives the solar intensity for the Netherlands, expressed by Joules per cm2.

Joule/cm2 can be converted to kW/ha, determining the energy potential of entire pieces of land. In summer this country receives the most solar energy and longest solar hours; in winter the percentage of total possible solar radiation is smallest.

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