On a cloudless summer's day, the measured global radiation is E_G-HOR = 850 W/m². The Sun is at an angle of 50° to the horizon Assume that there is no diffuse and reflected radiation.

a. What is the optimum inclination angle of the solar module and what is the irradiance E in this case? b. What is the irradiance for a inclination angle of the solar module of 15 to the horizon? Now take a winter's day: Epirect_H =EDiffus H= 300 W/m2. The sun is at an angle of 25 to %3D the horizon. c. What is the optimum inclination angle of the solar module and what is the irradiance in this case? Determine the best angle by trial and error.