A photovoltaic solar panel consists of a sandwich of (top to bottom) a 3-mm-thick ceria-doped glass (kg = 1.4 W/m ∙ K), a 0.1-mm-thick optical grade adhesive (ka = 145 W/m ∙ K), a very thin silicon semiconducting material, a 0.1-mm-thick solder layer (ks = 50 W/m ∙ K) and a 2-mm-thick aluminum nitride substrate (k an = 120 W/m ∙ K), The solar-to-electrical conversion efficiency within the semiconductor depends on the silicon temperature, Tsi , and is described by the expression η = 0.28 - 0.001 Tsi , where Tsi is in DC, for 25°C

(a) Consider an L = 1 m long, w = 0.1 m wide solar cell that is placed on an insulated surface. Determine the silicon temperature and the electric power produced by the solar cell for an air velocity of 4 m/s parallel to the long direction, with air and surroundings temperatures of 25°C. The solar irradiation is 700 W/m2. The boundary layer is tripped to a turbulent condition at the leading edge of the panel.

(b) Repeat part (a), except now the panel is oriented with its short side parallel to the air flow, that is, L = 0.1 m and w = 1 m.

(c) Plot the electric power output and the silicon temperature versus air velocity over the range 0

Transcribed Image Text:

Air Solar irradiation, G 0.1 G Glass Adhesive Silicon Solder Aluminum nitride 0.83 G L-