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GB/T 20148-2006Spatial Distribution of Daylight -- CIE Standard General Sky (English PDF)

日光的空间分布 CIE一般标准天空

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Level / Type

National · Recommended

Issue date

March 6, 2006

Implementation date

November 1, 2006

Scope

GB/T 20148-2006 is the English-translated version of 日光的空间分布 CIE一般标准天空.

GB/T 20148-2006 — This standard provides a set of theoretical and practical applications are related to sun light and ceiling lighting outdoor daylight conditions linked.

Given luminance distribution has the following characteristics: 1) they are symmetrical meridian sun, and are between the sun and the zenith angle of a function of the distance Zs.

2) they are defined as a smooth continuous function. This brightness distribution is typically sunny sky, characterized in that one of the clouds is monochrome.

They can provide daylight for many practical calculations is sufficiently accurate approximation of fragmented clouds sky. 3) at any point in the sky relative brightness of the sky surface element depends on the angle between the sun and the sky surface element x zenith angle between Z.

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Document preview — GB/T 20148-2006

National Standard of the People's Republic of China

ICS: 17.180.20
Classification: K 70

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

What this standard covers1
Document data2
Standards quoted by this document3

What this standard covers

This standard provides a set of theoretical and practical applications are related to sun light and ceiling lighting outdoor daylight conditions linked. Given luminance distribution has the following characteristics: 1) they are symmetrical meridian sun, and are between the sun and the zenith angle of a function of the distance Zs. 2) they are defined as a smooth continuous function. This brightness distribution is typically sunny sky, characterized in that one of the clouds is monochrome. They can provide daylight for many practical calculations is sufficiently accurate approximation of fragmented clouds sky. 3) at any point in the sky relative brightness of the sky surface element depends on the angle between the sun and the sky surface element x zenith angle between Z. The relative brightness of the two functions is given, relative scattering characteristic curve f (x) and the line of sight between the zenith luminance tone � (Z).

Document data

International classification (ICS): 17.180.20.

Chinese classification (CCS): K70.

Estimated length of the Chinese original: 11,147 words.

Adopted international standard: CIE S 011/E-2003, IDT.

Standards quoted by this document

GB/T 2900.65; ISO 31-6-1992

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Cited by

GB/T 5699-2025Method of daylighting measurements

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