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Thanks Ryan! I had read the help, but the problem is that the transmittivity also influence the value of the diffuse radiation. That makes it difficult to find representative settings for the time period, especially if it is for a whole year. Existing there recommended settings for other atmospheric conditions besides the clear sky condition? Because it is difficult to interpret the result when you change the diffuse proportion and transmittivity without having more thresholds for other atmospheric conditions, because you do not really know how strong the Solar Analyst values your changes. Best, Julian
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10-19-2011
11:04 PM
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Or if someone could explain me why the calculation of the direct radiation is not affected by the diffuse proportion! Because that sounds for me unrealistic and it falsified the calculation in my opinion. I could not find any information about that. Thank you very much! Best, Julian
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10-18-2011
11:31 PM
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Dear everyone, I am using the Solar Analyst (ArcMap 9.3.1) to calculate the solar insulation on roofs. I have question to the effect of the diffuse proportion on direct insulation. I run the area solar radiation tool with the default settings and afterwards I increased the diffuse proportion to 0.4. The results showed that this changed the values of the diffuse radiation but not of the values of the direct insulation! That means that more clouds (higher diffuse proportion) does not affect the direct insulation in the Solar Analyst. I thought the direct plus the diffuse proportion are 1 and so higher diffuse proportion lowers the insulation of direct radiation. In the description of the equations I could not find a connection between the diffuse proportion and the direct insulation. So it seems that the Solar Analyst does not consider the diffuse proportion in the calculation of the direct insulation. Am I right with this assumption? If not can you please explain me the connection? Best Regards, Julian
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10-17-2011
10:49 PM
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