A report, World Energy Assessment (WEA2000), estimated recoverable world geother

Question

A report, World Energy Assessment (WEA2000), estimated recoverable world geothermal resources would enable electric power generation at a rate of about 5 times 1021 J/yr, about 10 times the estimated world energy used in the year 2006. Assuming a range of heating values of between15-30 MJ/kg for different types of coal and, for coal burning power plants, an overall (heat to electricity) energy conversion efficiency of 37%, estimate the range for the mass of coal/yr needed to produce the same quantity of electrical energy as from the geothermal source estimate.

Explanation / Answer

Then M x 15 x .37 = 5 x 10^21
M = .9 x 10^21 upper limit
M = .45 x 10^21 lower limit
M = .45 x 10^21 lower limit

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