9. A wealthy farmer near Fargo, ND (Lat, Long 47 N; 97' W) is interested in dedicating some of his land to renewable energy. He decides to determine (with the help of a NDSU professor) how much land would be required to install a wind farm consisting of nine 1 MW HAWT's spaced 10D apart where D = 2R and R is the length of one turbine blade, laid out in a square array, allowing 50 to the property line. The turbines are 35% efficient. The average wind speed in Fargo is 11 mph. The local utility agrees to buy his energy @ $ 0.02 per kWh. The turbines cost 1 M$ each: funding is obtained through a zero interest loan, which is paid back with his revenues from the sale of the wind energy. (a) Required area (acres) (b) Payback Period (yr) 10. Continuing Problem 9, he also considers a solar farm (average daily solar insolation 4 kWh/m?). Assume that he covers half of the land of Problem 9(a) with solar panels costing $2 per watt; efficiency 20%. There is also a 30% discount for solar. (a) Cost ($) (b) Payback Period (yr) 9. A wealthy farmer near Fargo, ND (Lat, Long 47 N; 97' W) is interested in dedicating some of his land to renewable energy. He decides to determine (with the help of a NDSU professor) how much land would be required to install a wind farm consisting of nine 1 MW HAWT's spaced 10D apart where D = 2R and R is the length of one turbine blade, laid out in a square array, allowing 50 to the property line. The turbines are 35% efficient. The average wind speed in Fargo is 11 mph. The local utility agrees to buy his energy @ $ 0.02 per kWh. The turbines cost 1 M$ each: funding is obtained through a zero interest loan, which is paid back with his revenues from the sale of the wind energy. (a) Required area (acres) (b) Payback Period (yr) 10. Continuing Problem 9, he also considers a solar farm (average daily solar insolation 4 kWh/m?). Assume that he covers half of the land of Problem 9(a) with solar panels costing $2 per watt; efficiency 20%. There is also a 30% discount for solar. (a) Cost ($) (b) Payback Period (yr)