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发表于 2012-8-5 21:59:29
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楼主的问题很好,之前我也没仔细看过,一般在设计中只会用到Global Radiation,经过仔细搜索,关键问题在于对概念的理解,上述提到的Direct Radiation并不是我们所理解的,以下是对三种辐照概念的原文解释,看了就明白了:
1、Monthly Averaged Insolation Incident On A Horizontal Surface :The monthly average amount of the total solar radiation incident on a horizontal surface at the surface of the earth for a given month;
2、Monthly Averaged Direct Normal Radiation :The monthly average amount of solar radiation incident on a surface oriented normal to the solar radiation for a given month;
亮点在于at the surface of the earth !
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