Determination of the proportion of natural light in solar radiation using the method of conversion of lighting units into energy

Abstract

Abstract In the article the method for the determination of the fraction of visible light in solar radiation was proposed. The solar spectrum was divided into three regions: ultraviolet, visible and infrared radiation. The spectral distribution of the intensity of solar radiation under various conditions was considered. With the help of the Mathcad software package, the spectral luminosity of a black body was calculated. Further, the proportion of natural light in solar radiation was estimated. The proposed method of converting lumens to watts consisted of 5 stages: normalization of the spectral luminosity curve of BB in the visible range by one; determination of the energy fraction of each wavelength introduced into the radiation intensity; obtaining the dependence of the illumination distribution on the radiation wavelength in lumens on the basis of the eye visibility curve; multiplying the values of the normalized spectral luminance curve with the values of the eye visibility curve in lumens; summation (integration) of the obtained values. This calculation showed that 1 W/m2 of natural light is 213 lm/m2, which was confirmed by 100,000 lux (lm/m2) with solar radiation of 1000 W/m2.