a. Confirm that it gives you 859 W/m² under the following conditions: August 1,30° latitude, tilt 40°, southwest facing (−45°),3 pm solar time, reflectance 0.2 . Use the calculator to compute clear sky insolation under the following conditions (times are solar times):
b. January 1 , latitude 40°, horizontal insolation, solar noon, reflectance =0
c. March 15 , latitude 20°, south-facing collector, tilt 20°,11:00 am, reflectance =0.2
d. July 1 , latitude 48°, south-east collector (azimuth 45°), tilt 20°,2:00pm, reflectance = 0.3