# Solar Calculator

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 April 19, 2013, 03:08 Solar Calculator #1 New Member   Emon P Join Date: Mar 2013 Posts: 22 Rep Power: 6 Sponsored Links Hello, I use Solar Calculator today to compute solar irradiation. But I find that different version(ansys fluent 14.5 and fluent 6.3.26) gives me different results. Fluent Version 6.3.26 Fair Weather Conditions: Sun Direction Vector: X: -0.468382, Y: -0.19428, Z: 0.861901 Sunshine Fraction: 1 Direct Normal Solar Irradiation (at Earth's surface) [W/m^2]: 854.507 Diffuse Solar Irradiation - vertical surface: [W/m^2]: 134.182 Diffuse Solar Irradiation - horizontal surface [W/m^2]: 115.757 Ground Reflected Solar Irradiation - vertical surface [W/m^2]: 85.2258 Fluent Version 14.5 Fair Weather Conditions: Sun Direction Vector: X: -0.468382, Y: -0.19428, Z: 0.861901 Sunshine Fraction: 1 Direct Normal Solar Irradiation (at Earth's surface) [W/m^2]: 855.955 Diffuse Solar Irradiation - vertical surface: [W/m^2]: 98.3146 Diffuse Solar Irradiation - horizontal surface [W/m^2]: 115.383 Ground Reflected Solar Irradiation - vertical surface [W/m^2]: 85.3132 Most of the value are the same, but Diffuse Solar Irradiation - vertical surface is totally different, I am confused about this. And I don't know which one is right, so I could not continue the simulation. Can anyone help me? Thank you in advanced.

 July 25, 2013, 09:20 This is a bug #2 New Member   Benjamin Join Date: Sep 2011 Posts: 11 Rep Power: 7 The solar load calculator does not work correctly in Fluent 14.5+ It just takes the standard vector form the calculator instead of the given one, even if the checkbox is unchecked. This bug is supposed to be corrected in Fluent 15. The only workaround is to define the solar position using the north and east vectors.

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