Intensity of solar radiation

Instantaneous solar radiation received on a surface: watts per square metre (W/m2)

1 W/m2 = 0.1 mW/cm2

Integrated (or cumulative) solar radiation over a period of 24 h (= energy): watts x hour or kilowatts x hour per square metre per day (Wh/m2/day) or (kWh/m2/day)

Appendix 1 343

Example: Average cumulative solar radiation per day in Paris in December:

1.12 kWh/m2/day

Other units of energy: langley (Ly), joule per square centimetre (J/cm2) or kilo­calories per square metre (kcal/m2)

1 J/cm2 = 2.9 kcal/m2 = 2.78 Wh/m2

1 Ly = 1 cal/cm2 = 11.62 Wh/m2

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