Method for calculating irradiance of sky brightness to ground

A calculation method and irradiance technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of not being able to accurately indicate the actual radiation value, inaccurate calculation of the sky-to-ground radiation, etc., to achieve convenient and accurate implementation. high degree of effect

Inactive Publication Date: 2014-07-23
成都颐泰智能科技股份有限公司
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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

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  • Method for calculating irradiance of sky brightness to ground
  • Method for calculating irradiance of sky brightness to ground
  • Method for calculating irradiance of sky brightness to ground

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Embodiment

[0042] Aiming at the disadvantage of inaccurate calculation of sky-to-ground radiation by the traditional method, the present invention proposes a method for obtaining very accurate sky-to-ground radiance values ​​based on precise division of sky elements and an accurate sky brightness model.

[0043] According to the characteristics of the sky, the present invention accurately divides the sky into several sky elements according to the concept of solid angle, then calculates the brightness of the sky element, and finally calculates the radiation illuminance of the sky to the ground according to the law of solid angle projection. For the convenience of description, the symbols and terms used in this paper are defined as follows:

[0044] solid angle : The solid angle is defined as the ratio of the surface area of ​​the part cut by the cone on the spherical surface to the square of the radius of the spherical surface, taking the base point of the cone as the center of the spher...

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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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Application Information

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IPC IPC(8): G06F19/00
Inventor 张洋李银春薛博
Owner 成都颐泰智能科技股份有限公司
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