These calculations require theoretical or empirical distributions of direct and diffuse radiation in the open, without canopy or other sky obstruction.
2.
The increased output can be of the order of 30 % in locations with high levels of diffuse radiation, due to overcast conditions.
3.
In addition, a smaller gap will receive more direct radiation from the sun, whereas a larger gap will receive high amounts of diffuse radiation.
4.
The primary energy input is the global light irradiance in the plane of the solar arrays, and this in turn is a combination of the direct and the diffuse radiation.
5.
Similarly, diffuse solar radiation is calculated as the sum of all diffuse radiation ( scattered from the atmosphere ) originating from any visible ( non-obscured ) sky directions ( see diffuse sky radiation ).
6.
It cannot be defined simply as a part or set of parts of the electromagnetic spectrum, because the spectral composition of window radiation varies greatly with varying local environmental conditions, such as water vapour content and land-sea surface temperature, and because few or no parts of the spectrum are simply not absorbed at all, and because some of the diffuse radiation is passing nearly vertically upwards and some is passing nearly horizontally.
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