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Consider a south facing solar collector at a tilt angle of 35 in London, UK on 21st September at noon. The collector is on an open frame above a concrete surface that has an albedo factor of 0.25 . Assume solar time and local time are the same. If the direct irradiance on a surface normal to the direction of the sun is 650W/m2 and the global irradiance on the solar collector is measured at 800W/m2, then a. What percentage of the global irradiance on the collector is attributed to direct irradiance? b. What is the diffuse irradiance on a horizontal surface