太陽エネルギー利用のための分光日射量の測定と整理

第2報,ランク分けした分光日射スペクトルの規格化による整理

抄録

The measurement results of spectral insolation are ranked every 100 W/m2 based on global insolation. It is clarified that the spectra for total radiation in each ranking are similar to each other. Although the peak value of the spectra can be found at the wavelength of 0.48 p.m, on a clear day, energy of longer wavelength than the peak in the spectra is more attenuated than that on a cloudy day, so that the slope of the spectra is steep, and the absorption effect in the atmosphere is stronger than the other effect. Normal direct radiation is related to the rank amount of direct insolation or the altitude of the sun, and thus the peak value of wavelength on the spectra shifts from 0.48 j.tm to 0.76 p.m. With respect to the total radiation ranked, the spectra normalized by its peak value gather each other, and ratios of the spectra are converged upon unity with a deviation ±20 percent for all the rank.