Direct beam solar radiation is the type of solar radiation that directly reaches the surface of the Earth. Global solar radiation is the total of both diffuse and direct sun radiation. Direct beam radiation can be reduced by atmospheric conditions by 10% on clear, dry days and by 100% on heavy, gloomy days.
What is the Measurement of Direct Beam Radiation?
At various periods of the year, scientists measure the amount of sunshine that strikes particular regions. The amount of sunshine that strikes areas with comparable climates and latitudes is then estimated. Total radiation on a horizontal surface or total radiation on a surface that tracks the sun are the two common ways that solar energy is measured.
Kilowatt-hours per square meter (kWh/m2) are frequently used to express radiation statistics for solar electric (photovoltaic) systems. Watts per square meter (W/m2) can also be used to indicate direct estimations of solar energy.
British thermal units per square foot (Btu/m2) are the standard unit of measurement for radiation data for solar water heating and space heating systems.
Recommended: What is Diffuse Radiation?
