| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Research Abstract |
If the characteristics of sky radiance distribution in different weathers are well known, it is relatively easy to make up diffuse solar radiation models in respective weathers based on the knowledge of it.Taking account of that, the study has been carried out for the purpose of clarifying the characteristics of sky radiance distribution in different weathers.
In the process of attaining the purpose, it is the first necessary step that a lot of data on sky radiance distribution in different weathers and different solar altitudes are collected by actual measurement. lowever, no convenient instruments for the measurement of sky radiance distribution have not been on the market. And so, the author tried to experimentally produce an apparatus for rapid acquisition of the data on sky radiance distribution in 1991 and improved it in 1992. As the result of it,the apparatus has become good enough to be relied upon for practical use.
As for the radiance distribution on clear skies or on overcast skies, pretty reliable models expressed in the form of mathematical equations could be derived through the theoretical consideration about the respective phenomena and the examination of the collected data.
The category of intermediate skies comprises of a wide variety of skies which are neither clear nor overcast, and the characteristics of radiance distribution on each sky are complicated. As for the radiance distribution on intermediate skies, the author thinks that the model should be composed in a form similar to but a little different from the model for clear skies. But detailed mathematical expression is still under consideration.
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