I'd like to get hourly solar data to generate TMY for local place. But I have a problem with the data. As we know that Solar data have the relationship with:
Solar Global Horizontal (GHI) = Direct Normal (DNI) X cos(θ) + Diffuse Horizontal (DHI)
But when I put the data in Elements (a tool for generating EPW weather file), I found the data I got do not match that.
For the GHI and DHI, I chose the fixed mounting type, slope and azimuth were set to 0.
For the DNI, I chose the Two-axis mounting type.
Could anyone answer my doubt? Thank you.
Can you give more details? Also, how much Zenith angle and why Azimuth angle is zero?
Calculation of Solar Insolation
Based on the equation of the sun's position in the sky throughout the year, the maximum amount of solar insolation on a surface at a particular tilt angle can be calculated as a function of latitude and day of the year. These calculations are also essential in using experimental data from sunshine hour recorders.
Please follow this link to know more.
https://www.pveducation.org/pvcdrom/properties-of-sunlight/calculation-of-solar-insolation
Greetings
Ahmed Fawzy
Thank you for all helping!
Acutually I need hourly data of global horizontal radiation, direct normal radiation and diffuse horizontal radiation. But I am not sure I chose the right settings to obtain them from PVGIS database.
The settings are shown in the following pictures.
Just click on "Radiation components" further down and you will get all what you need
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