Suppose the average solar fl ux reaching the UnitedStates is 200 W/m2. This average is
Chapter 11, Problem 28(choose chapter or problem)
Suppose the average solar fl ux reaching the UnitedStates is 200 W/m2. This average is taken over a wholeyear, and takes into account seasonal effects and weather(clouds), and assumes fi xed solar cells. (a) Find the totalenergy produced in one year by a 1-m2 cell producingenergy with an effi ciency of 15%. (b) How mucharea would have to be covered with these solar cells tosupply the United States with all its electricity, if theyearly electrical energy consumption in the UnitedStates is about 4.0 1012 kW # h? (c) Real solar arraysrequire about 2.5 times as much area as you foundin (b) in order to keep one array of cells from shadinganother. What fraction of the land area of theUnited States (about 9 106 km2) would have to becovered with solar cells to meet the nations energyrequirements?
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