Define each of the following as used in solar systems:
(a) irradiance;
(i) diffuse radiation. (4 marks)craft1 electrical June/July 2020
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(a) Irradiance: Irradiance is the measure of the intensity of solar radiation received by a surface, typically measured in watts per square meter (W/m²).
(b) Diffuse radiation: Diffuse radiation is solar radiation that has been scattered by the atmosphere and is not directly aligned with the sun. It is often referred to as “sky radiation” and can contribute significantly to the total solar radiation received by a surface, especially on cloudy days.