| Name |
Description |
Code value |
| diffuseIrradiance |
Part of <i>solar power</i> (instantaneous rate of radiant energy), falling on a surface on the Earth per unit time, which is scattered by air molecules or atmospheric particles such as aerosols or clouds [W.m<sup>-2</sup>].
-- Description --
NOTE 1 If not specified otherwise, diffuse irradiance falling on a <i>horizontal</i> surface is implicitly considered. In modelling solar power, diffuse <i>in-plane</i> irradiance can be calculated from diffuse horizontal irradiance (e.g. when considering a tilted surface of photovoltaic modules), and in such a case these two parameters have to be explicitly differentiated.
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| diffuseIrradiation |
Amount of <i>solar energy</i> (integrated over a time), falling on a surface on the Earth, which is scattered by air molecules or atmospheric particles such as aerosols or clouds [Wh.m<sup>-2</sup>].
-- Description --
NOTE 1 If not specified otherwise, diffuse irradiation on a <i>horizontal</i> surface is implicitly considered.
In solar energy, diffuse <i>in-plane</i> irradiation can be calculated from diffuse horizontal irradiation (e.g. when considering a tilted surface of photovoltaic modules), and in such a case these two parameters have to be explicitly differentiated. Total amount of energy is typically summarised per hour, day, month or year. This parameter is sometimes used as a complementary parameter for an assessment of long-term performance of solar energy installations. Within the INSPIRE context practical use of this parameter is rather limited.
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| directNormalIrradiance |
Part of <i>solar power</i> (instantaneous rate of radiant energy), falling on a surface perpendicular to the Sun's rays per unit time, which is not scattered or reflected by air molecules or atmospheric particles [Wh.m<sup>-2</sup>].
-- Description --
NOTE 1 This is part of shortwave solar radiation that reaches the Earth surface directly. In solar energy, an acronym <i>DNI</i> is often used for Direct Normal Irradiance, this can also be referred to as beam irradiance. Together with Global Horizontal Irradiance these are the most often used parameters in solar energy.
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| directNormalIrradiation |
Amount of <i>solar energy</i> (integrated over a time), falling on a surface perpendicular to sunrays, which is not scattered or reflected by air molecules or atmospheric particles [Wh.m<sup>-2</sup>].
-- Description --
SOURCE Adapted from [PS 1996] and [PSRIS 1986].
NOTE 1 This is part of solar radiation that reaches the Earth surface directly. In solar energy, the acronym <i>DNI</i> is used for Direct Normal Irradiation (in the same way as Direct Normal Irradiance). Sometimes a term <i>beam irradiation</i> is used. Together with Global Horizontal Irradiation, these are the most often used parameters in solar energy. Typically, DNI is used for a long-term performance assessment of two groups of solar energy facilities: Concentrated Solar Power (CSP, sometimes known also as solar electrical thermal power stations) and for Concentrated Photovoltaics (CPV).
NOTE 2 Within the INSPIRE context, the most valuable aggregated form of data for a public use and official authorities are long-term annual (or monthly) averaged values of DNI. These can be used for studies of potential use of CSP and CPV technologies within a country or region.
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| globalHorizontalIrradiance |
<i>Solar power</i> (instantaneous rate of total radiant energy) attenuated by all constituents of the atmosphere and falling on a horizontal surface on the Earth per unit time. Global horizontal irradiance integrates direct, diffuse and reflected components of solar power [W.m<sup>-2</sup>].
-- Description --
NOTE 1 In solar energy, an acronym <i>GHI</i> is used for Global Horizontal Irradiance. GHI is the most often used parameter in simulation software for assessing performance of solar energy systems. In simulation software, for tilted or sun-tracking surfaces in photovoltaics or solar heating/cooling, often global <i>in-plane</i> irradiance is computed from GHI. Therefore term <i>global in-plane irradiance</i> has to be differentiated from <i>global horizontal irradiance.</i> This parameter features site and time specific time series which are used mainly in a private business sector.
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| globalHorizontalIrradiation |
Amount of <i>solar energy</i> (integrated over a time) attenuated by all constituents of the atmosphere and falling on a horizontal surface on the Earth. Global horizontal irradiation integrates direct, diffuse and reflected components of solar energy [Wh.m<sup>-2</sup>].
-- Description --
SOURCE Adapted from [PS 1996] and [PSRIS 1986].
NOTE 1 In solar energy, the acronym <i>GHI</i> is used for Global Horizontal Irradiation (in the same way as Global Horizontal Irradiance). In solar energy, GHI is the most often used for assessing long-term performance of solar energy systems.
NOTE 2 For tilted or sun-tracking surfaces (in photovoltaics or solar heating/cooling), often global <i>in-plane</i> irradiation is computed from GHI. Therefore term <i>global in-plane irradiation</i> has to be differentiated from <i>global horizontal irradiation.</i> Total amount of energy is typically summarised per hour, day, month or year and this aggregation is used mainly by private business.
NOTE 3 Within the INSPIRE context, the most valuable aggregated form of data for a public use and official authorities are long-term annual (or monthly) averaged values of GHI. These can be used for studies of potential use of photovoltaic and solar heating/cooling technologies within a country or region.
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