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QUESTION 23 (14 marks) A business wants to install a renewable energy farm to partially offset its electricity consumption over the next 10 years. A summary of the two options is shown. Form of Initial cost | Annual cost Rate of energy Average working renewable energy production (kW) time (hours per day) a) b) Cc) Determine the average annual cost ($/year) annual energy production (kWh/year) and average energy cost (c/kWh) for i) solar. [3 marks] li) wind. [3 marks] Justify a conclusion about the most cost-effective form of renewable energy for the business. [2 marks] Explain a technological environmental and geographical factor that the business should consider when choosing a solar or wind farm. [6 marks]
QUESTION 15 A scientific agency conducted a study to evaluate the efficiency of wind and hydroelectric renewable energy sources at different locations. Name plate capacity Average annual (MW) production (MW-h) Hydro at location X 209.3 875 000 Energy Wind at location X 2080 4 200 000 Hydro at location Y 189.4 905 000 Wind at location Y 1980 4 050 000 Compare the efficiency of wind and hydroelectric renewable energy sources in the table above to determine the most efficient renewable energy system. (A) hydro at location X (B) wind at location X (C) hydro at location Y (D) wind at location Y
QUESTION 7 An experiment compared the energy output of a model wind turbine using four different blade shapes. Blade First trial Second trial Third trial Mean (kW h) (kW h) (kW h) (kW h) a 298 293 356 316 271 304 357 304 179 118 145 Which blade produced the most consistent supply of energy? (A) 1 (B) 2 (C) 3 (D) 4
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