Glossary of Solar Radiation Resource Terms

Other relevant glossaries


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Kelvin - the temperature unit based on the theoretical minimum temperature, used in many physical calculations. The relationship between Kelvin and Celsius is

    K = C + 273.16


KD - the ratio between diffuse sky radiation and extraterrestrial radiation, used as a normalization of the diffuse sky radiation because KD removes the effect of low sun angle and reduces the scale of values to between 0 and 1.

    KT = KN + KD


KN - the ratio between direct normal irradiance and tracking extraterrestrial radiation, used as a normalization of the direct normal irradiance because KN removes the effect of low sun angle and reduces the scale of values to between 0 and 1.

    KT = KN + KD


KT - the ratio between global horizontal radiation and extraterrestrial radiation, used as a normalization of the global horizontal radiation because KT removes the effect of low sun angle and reduces the scale of values to between 0 and 1.

    KT = KN + KD


kW - kilowatt, or 1000 Watts, a unit of power.


kWh - kilowatt-hour, a unit of energy equivalent to (1000 = kilo) x (3600 seconds) = 3,600,000 Joules, or 3.6 MJ; the amount of energy a kilowatt source produces in one hour


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