Question 6. A photovoltaic panel consists of (top to bottom) a 3-mm-thick ceria-doped glass (kg = 1.4 W/m.K), a 0.1-mm-t

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Question 6 A Photovoltaic Panel Consists Of Top To Bottom A 3 Mm Thick Ceria Doped Glass Kg 1 4 W M K A 0 1 Mm T 1 (660.81 KiB) Viewed 35 times

Question 6. A photovoltaic panel consists 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 (k₂ = 145 W/m·K), a very thin layer of sili- con within which solar energy is converted to electrical energy, a 0.1-mm-thick solder layer (Ksdr = 50 W/m.K), and a 2-mm-thick aluminum nitride substrate (kan = 120 W/m.K). The solar-to-electrical conversion efficiency within the silicon layer n decreases with increasing silicon temperature, Ts, and is described by the expression n = a - bÃ, where a = 0.553 and b = 0.001 K-¹. The temperature T is expressed in kelvins over the range 300 K ≤ T ≤ 525 K. Of the incident solar irradiation, G = 700 W/m², 7% is reflected from the top surface of the glass, 10% is absorbed at the top surface of the glass, and 83% is transmitted to and absorbed within the silicon layer. Part of the solar irradiation absorbed in the silicon is con- verted to thermal energy, and the remainder is converted to electrical energy. The glass has an emissivity of ε = 0.90, and the bottom as well as the sides of the panel are insulated. Determine the electric power P produced by an L = 1-m-long, w = 0.1-m-wide solar panel for conditions characterized by h = 35 W/m²·K and T = Tsur = 20°C.