GB/T 33677-2017Classification of solar energy resources—Direct radiation (English PDF)
太阳能资源等级 直接辐射
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 12, 2017
Implementation date
December 1, 2017
Scope
GB/T 33677-2017 is the English-translated version of 太阳能资源等级 直接辐射.
GB/T 33677-2017 sets the grades into which the direct component of solar radiation is classified, so that a site can be rated as a direct-radiation resource.
It defines the radiation quantities the grading uses: direct solar radiation, normal direct radiation measured on a plane perpendicular to the sun's rays, direct radiation on the horizontal plane, obtained from the normal value through the solar height angle and the solar zenith angle, global solar radiation as the sum of the direct and the scattered radiation received over the upper 2 pi solid angle, and irradiance.
It cites GB/T 31155, which grades total radiation. Bodies that evaluate and map solar direct radiation resources use it. GB/T 33677-2017 was issued on 12 May 2017 and has applied since 1 December 2017.
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Document preview — GB/T 33677-2017
National Standard of the People's Republic of China
- ICS
- 07.060
- Classification
- A 47
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative reference documents
- 3 Terms and definitions
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the level of solar energy (direct radiation).
This standard applies to the evaluation and division of solar direct radiation resources.
2 Normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 31155 solar energy grade total radiation
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Direct radiation
From the surface and its surrounding a small solid angle emitted within the radiation.
Note: rewrite GB/T 31163-2014, defined 5.11.
3.2 Normal direct radiation
Direct radiation received on a plane perpendicular to the sun's rays.
Note: From the numerical point of view, direct radiation and direct radiation is the same; the difference between the two is that direct radiation is defined from the perspective of the sun, the law Direct radiation is defined from the perspective of the receiving plane. In the field of solar energy resources, commonly used to direct the direct radiation of the term to distinguish between the horizontal straight Then radiation. [GB/T 31163-2014, definition 5.12]
3.3 Direct radiation of the horizontal plane
Direct radiation received on the horizontal plane.
Note 1: The relationship between the direct direct radiation and the direct radiation of the horizontal plane is: DH = DN · sin h = DN · cos theta z, where DH is the direct radiation of the horizontal plane, DN is Normal direct radiation, h for the sun height angle, thetaz for the sun zenith angle.
Note 2: rewrite GB/T 31163-2014, definition 5.13.
3.4 Total radiation
The sum of the direct radiation and the scattered radiation received by the horizontal plane from the upper 2 pi solid angle range. [GB/T 31163-2014, definition 5.15]
3.5 Irradiance
Objects in the unit time, the unit area to receive the radiation energy.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
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