Question

b)Consider an ideal wind turbine with a rotor diameter of 126m. What is the power generated by this turbine if the wind moves at 20 ms^-1 into the turbine, exerts no drag on the rotor blades, etc., and exits the turbine at 15ms^-1? Calculate the efficiency of the wind turbine described,Give your answer as a fraction not a percentage.

d)The U.S. consumes 20,680,000 barrels of crude oil per day. There are 159 L in a barrel of oil. Crude oil has an average density of 900 kg m^-3 and an average heat of combustion ΔH_comb=4.47x10⁴ kJ/kg. Suppose we burn on average 90% of the oil that we consume per day. Calculate the heat produced in one day in the U.S. from burning oil.  

e)Suppose this heat were converted to work via heat engines with an average efficiency of 30%. What is the average daily power power output from burning oil?

Answer 1