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Land footprint of solar energy: (a) In 2016, Arizona’s total annual electricity consumption was 78.05 million MWh....

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Physics

Land footprint of solar energy:

(a) In 2016, Arizona’s total annual electricityconsumption was 78.05 million MWh. What is this in terms of kWh perday?

(b) Land footprint: The average dailyinsolation in Phoenix is 5.38 kWh/m2/day. Given this daily energyinput, how much land area would you need (in square miles) togenerate all of Arizona’s daily electricity from the followingtypes of PV panels:

i. Mono-crystalline Si panels with an efficiency of 22 %?

ii. Thin film CdTe with an efficiency of 12%?

(c) Translate to rooftops: Assuming we use 22%efficient mono-crystalline Si panels, how many rooftops would thattake if we put the panels on:

i. Wal-Mart stores with an average size of 102,000 squarefeet?

ii. Household rooftops with an average size of 2,000 squarefeet?

(d) Reflection: These types of crude statisticsget used all the time in public debates about solar energy. Do youthink they’re useful? Why or why not? Take about 3-4 sentences toexplain what we learn from this exercise and whether you think it’suseful for talking about solar energy.

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