Direct Solar Radiation in Radiation Formulas

Direct solar radiation is the part of solar radiation that reaches the earth’s surface without being scattered or absorbed by the atmosphere. And is denoted by G_D. Direct Solar Radiation is usually measured using the Watt per Square Meter for Heat Flux Density. Note that the value of Direct Solar Radiation is always positive.

Radiation formulas that make use of Direct Solar Radiation

fxTotal solar energy incident on unit area of horizontal surface on groundGo

fxDiffuse solar radiation given total solar energy and direct radiationGo

FAQ

What is the Direct Solar Radiation?

Direct solar radiation is the part of solar radiation that reaches the earth’s surface without being scattered or absorbed by the atmosphere. Direct Solar Radiation is usually measured using the Watt per Square Meter for Heat Flux Density. Note that the value of Direct Solar Radiation is always positive.

Can the Direct Solar Radiation be negative?

No, the Direct Solar Radiation, measured in Heat Flux Density cannot be negative.

What unit is used to measure Direct Solar Radiation?

Direct Solar Radiation is usually measured using the Watt per Square Meter[W/m²] for Heat Flux Density. Kilowatt per Square Meter[W/m²], Watt per Square Centimeter[W/m²], Watt per Square Inch[W/m²] are the few other units in which Direct Solar Radiation can be measured.

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