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Direct Solar Radiation in an Inclined Surface Calculator












Direct Solar Radiation Formula

Direct Solar Radiation (Qi=Qo×D×A×cos(α)):

Where:

  • Qi is the direct solar radiation, in kilowatts (kW).
  • Qo is the solar constant, in kilowatts per square meter (kW/m²).
  • A is the absorber surface area, in square meters (m²).
  • D is the transmission factor (0.06 – 0.82).
  • α is the angle between a line perpendicular to the surface and the direction of radiation, in degrees.

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