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A dam produces 250W/m^2 of electricity. It composed of 7x10^9kg of concrete. Concrete requires 1MJ of energy to produce per kg. How much energy did it take to produce the dam? How long is the 'energy payback time" for the dam?
 2 years ago
 2 years ago
A dam produces 250W/m^2 of electricity. It composed of 7x10^9kg of concrete. Concrete requires 1MJ of energy to produce per kg. How much energy did it take to produce the dam? How long is the 'energy payback time" for the dam?
 2 years ago
 2 years ago

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shaan_iitkBest ResponseYou've already chosen the best response.1
a) 7*10^9 MJ b) 7*10^9*10^6/(250*A*3600*24) days ... here A is the area of the dam in m^2
 2 years ago

UnamBest ResponseYou've already chosen the best response.0
But the area of the dam is not given, how should i calculate it?
 2 years ago

shaan_iitkBest ResponseYou've already chosen the best response.1
well then take it as 1 ... though area of the dam should be given ...
 2 years ago

UnamBest ResponseYou've already chosen the best response.0
Ok, well the second part of the question the area was given which is 274mi^2 and the efficiency is 12%.... back to the question a would be answer for the energy right?? Thanks so much Shaan!
 2 years ago
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