Method for calculating irradiance of sky brightness to ground

Abstract

The method discloses a method for calculating the irradiance of sky brightness to the ground. The problems that in the prior art, the irradiance of the sky to the ground is calculated inaccurately and an obtained result can not accurately show the actual irradiance value are solved. The method for calculating the irradiance of sky brightness to the ground comprises the following steps that the sky is regarded as a hemisphere, looked from top to bottom, the hemispherical sky is divided into 4k2 blocks and k layers, and each layer is provided with 4k blocks, wherein k >=1, and the azimuth angle, the elevating angle and the zenith angle of each sky element are determined; according to a sky brightness distribution formula, the height of each sky element and the brightness of the zenith are calculated; based on obtained parameters and according to a solid angle projection law, the irradiance value of the brightness value of each sky element to the ground is calculated and after all the irradiance values of the sky elements to the ground are summated, the irradiance value of the whole sky to the ground is obtained. Through the scheme, the purposes that calculation is accurate and the actual irradiance value is accurately expressed are achieved, and the practical value and the popularization value are high.

Description

technical field [0001] The invention relates to a method for calculating sky brightness to ground irradiance. Background technique [0002] In addition to considering energy saving and emission reduction in today's architectural design, another indicator is reasonable lighting. In addition to the lighting source of the interior itself, we hope to obtain a larger source of lighting from natural light. In natural light, except for direct sunlight, which is considered for shading according to needs, the rest of the light is the reflection, scattering, and sky brightness radiation of outdoor scenes. Due to the inconsistency of location, size, and material of outdoor scenes, it is difficult to quantitatively analyze them, while sky brightness is a relatively complete concept, which is suitable for the analysis of ground illuminance. [0003] At present, the traditional methods of calculating the sky brightness to the ground radiation all use the traditional empirical formula pl...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a calculation method of sky brightness to ground irradiance, which mainly solves the problem in the prior art that the calculation of sky-to-ground radiation is inaccurate and the obtained results cannot accurately indicate the actual radiation value.

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