
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
K_{D} 
the ratio between
diffuse sky radiation and
extraterrestrial radiation,
used as a normalization of the diffuse sky radiation because K_{D} removes
the effect of low sun angle and reduces the scale of values to between 0 and 1.
K_{T} = K_{N} + K_{D}
K_{N} 
the ratio between
direct normal irradiance and
tracking
extraterrestrial radiation,
used as a normalization of the direct normal irradiance because K_{N} removes
the effect of low sun angle and reduces the scale of values to between 0 and 1.
K_{T} = K_{N} + K_{D}
K_{T} 
the ratio between
global horizontal radiation and
extraterrestrial radiation,
used as a normalization of the global horizontal radiation because K_{T} removes
the effect of low sun angle and reduces the scale of values to between 0 and 1.
K_{T} = K_{N} + K_{D}
kW 
kilowatt, or 1000 Watts, a unit of power.
kWh 
kilowatthour, 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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