Question

Question 8 (5 points) The pure silicon needed for solar panels and computer chips is very energy intense, taking roughly 1,500 MJ of primary energy for every kg of silicon needed. A particular solar installation will require 125 panels. The silicon in each panel will be 294 um thick, and 133 cm by 147 cm. Each panel will need to be on average 49 cm apart and will need to be at an angle of -53º. Silicon has a density of 2330 kg/m? How much primary energy is needed to make the silicon for this solar installation? (Answer in MJ) Your Answer: Answer

Answer 1

y mass 5.75x10m Energy required per kg = e = 1500x15 J Volume of each panel silicon v=294x16x 133x20 2 x 147x10² = 5.75 x 10 m² 1 panel x 2330 1-34 kg Total number of ponels N= 125 so Total mors of silicon M = m N=1.34×125 M=167.5 kg Energy E = ME 1500x167.5 E = 251250 MJ

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