BS ISO 9060:2018 pdf download

BS ISO 9060:2018 pdf download.Solar energy — Specification and classification of instruments for measuring hemispherical solar and direct solar radiation
1 Scope
This document establishes a classification and specification of instruments for the measurement of hemispherical solar and direct solar radiation integrated over the spectral range from approximately 0,3 μm to about 3 μm to 4 μm. Instruments for the measurement of hemispherical solar radiation and direct solar radiation are classified according to the results obtained from indoor or outdoor performance tests. This document does not specify the test procedures.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
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3.1 hemispherical solar radiation
solar radiation received by a plane surface from a solid angle of 2π sr
Note 1 to entry: Approximately 97 % to 99 % of the hemispherical solar radiation incident at the Earth’s surface is contained within the wavelength range from 0,3 μm to 3 μm [1] . Generally, hemispherical solar radiation is composed of direct solar radiation and diffuse solar radiation (solar radiation scattered in the atmosphere) as
well as solar radiation reflected by the ground.
3.2 global horizontal irradiance
hemispherical solar radiation received by a horizontal plane surface
Note 1 to entry: The tilt angle and the azimuth of the receiver surface should be specified, e.g. horizontal.
3.3 direct solar radiation
radiation received from a small solid angle centred on the sun’s disc, on a given plane
Note 1 to entry: In general, direct solar radiation is measured by instruments with field-of-view angles of up to 6°. Therefore a part of the scattered radiation around the sun’s disc (circumsolar radiation or aureole) is also included (see 5.1). Historic pyrheliometers of the Angström type (compensation pyrheliometer) have a larger field of view of up to 15°. A more detailed definition of circumsolar radiation and related parameters can be found in Reference [2].
Note 2 to entry: Approximately 97 % to 99 % of the direct solar radiation received at the ground is contained within the wavelength range from 0 μm to 3 μm [1]
3.4 diffuse solar radiation
diffuse radiation
hemispherical solar radiation minus coplanar direct solar radiation
Note 1 to entry: For the purposes of solar energy technology, diffuse radiation includes solar radiation scattered in the atmosphere as well as solar radiation reflected by the ground, depending on the inclination of the receiver surface.
Note 2 to entry: The tilt angle and the azimuth of the receiver surface should be specified, e.g. horizontal.