ASTM G197-14
太陽光光譜分布參考標準表: 20°傾角和垂直標準的直射和漫射
Standard Table for Reference Solar Spectral Distributions: Direct and Diffuse on 20° Tilted and Vertical Surfaces
ASTM G197-14 發布歷史
ASTM G197-14由美國材料與試驗協會 US-ASTM 發布于 2014。
ASTM G197-14在國際標準分類中歸屬于: 17.180.01 光學和光學測量綜合,27.160 太陽能工程。
ASTM G197-14 發布之時，引用了標準
- ASTM E490 標準太陽常數和零空氣質量太陽光譜輻照度表
- ASTM E772 有關太陽能轉換的標準術語
- ASTM G173 參考太陽光譜輻照度的標準表:37?斜面上直接垂直和半球狀
- ASTM G177 太陽紫外線光譜分布參考標準表:37度傾斜表面上的半球形分布
ASTM G197-14的歷代版本如下：
- 2021年 ASTM G197-14(2021) 參考太陽光譜分布標準表:20°傾斜和垂直表面上的直接和漫反射
- 2014年 ASTM G197-14 太陽光光譜分布參考標準表: 20°傾角和垂直標準的直射和漫射
- 2008年 ASTM G197-08(2012) 參考太陽光譜分布的標準表:20度傾斜和垂直面上的直射和散射
- 2008年 ASTM G197-08 太陽光光譜分布參考標準表:20 °傾角和垂直面的直射和漫射
5.1 This standard does not purport to address the mean spectral irradiance incident on tilted or vertical fenestration or building-integrated systems over a day, a season, or a year. The spectral irradiance distributions have been chosen to represent a reasonable near-upper limit for solar radiation when these systems are exposed to clear-sky conditions similar to those used to calculate solar heat loads of buildings. The diffuse spectral irradiance distributions can also be used to represent conditions when these systems are shaded from the direct sun.
5.2 Absorptance, reflectance, and transmittance of solar radiation are important factors in studies of light transmission through semi-transparent plates. These properties are normally functions of wavelength, which require that the spectral distribution of the solar flux be known before the solar-weighted property can be calculated.
5.3 To compare the relative performance of competitive products by computerized simulations, or to compare the performance of products subjected to experimental tests in laboratory conditions, a reference standard solar spectral distribution for both direct and diffuse irradiance is desirable.
5.4 The table provides appropriate standard spectral irradiance distributions for determining the relative optical performance of semi-transparent materials and other systems. The table may be used to evaluate components and materials for the purpose of solar simulation where the direct and the diffuse spectral solar irradiances are needed separately.
5.5 The selected air mass value of 1.5 for a plane-parallel atmosphere above a flat earth corresponds to a zenith angle of 48.19°. The SMARTS2 computation of air mass accounts for atmospheric curvature and the vertical density profile of molecules, which results in a solar zenith angle of 48.236°, or an equivalent plane-parallel-atmosphere air mass of 1.50136. The angle of incidence computed by SMARTS for the direct beam irradiance incident on a 20°-tilted plane facing the sun is thus 28.236°. It is 41.764° for a 90°-tilted surface facing the sun.
5.6 A plot of the SMARTS model output for the reference direct radiation on a 20° and 90° tilted surfaces is shown in Fig. 1. A similar plot, but for diffuse radiation, is shown in Fig. 2.
5.7 The input needed by SMARTS to generate the spectra for the prescribed conditions and the 20°-tilted surface is provided in Table 1. The input file for the 90°-tilted surface differs only by one line. This modified line appears in Table 2.
5.8 The total irradiance, integrated over the spectral range 280–4000 nm, is 791.07, 93.02, 97.96, and 889.03 W·m-2 for direct, sky diffuse, tota......
- 標準號
- ASTM G197-14
- 發布
- 2014年
- 發布單位
- 美國材料與試驗協會
- 替代標準
- ASTM G197-14(2021)
- 當前最新
- ASTM G197-14(2021)
- 引用標準
- ASTM E490 ASTM E772 ASTM G173 ASTM G177