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  1. R

    A question about SWDOWN (DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE)

    Hi Ming, Do you have a document explaining how SWDOWN is calculated? I want to compare SWDOWN with the global horizontal irradiance calculated from the solar radiation model provided by ASHRAE Handbook.
  2. R

    A question about SWDOWN (DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE)

    Hi Ming, It is from the TMY3 weather data. Global Horizontal Solar Irradiance is total amount of direct and diffuse solar radiation received on a horizontal surface. It is calculated by models.
  3. R

    A question about SWDOWN (DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE)

    Hi Ming, Thanks for replying. Is SWDOWN the same as Global Horizontal Solar Irradiance?
  4. R

    A question about SWDOWN (DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE)

    Hi all, There is an output called SWDOWN (DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE). Is this the same as Global Horizontal Solar Irradiance? How can I calculate the direct normal irradiance and the diffuse horizontal irradiance (which are needed for our building modeling) from it? Thanks a lot.
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