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Quote:
Originally Posted by DayoftheGreek View Post

Because burning huge amounts of coal in one spot is more efficient than having hundreds of thousands of tiny gasoline burners driving around.

I'm not sure how you figured your statistics but when you figure in those few hundred thousand cars running off the grid - those power plants are gonna consume a lot more fuel.

(it's actually a couple hundred million, btw)
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post #92 of 92
Quote:
Originally Posted by Cavi Mike View Post

I'm not sure how you figured your statistics but when you figure in those few hundred thousand cars running off the grid - those power plants are gonna consume a lot more fuel.

(it's actually a couple hundred million, btw)

I was sort of sticking with the 1 to 1 comparison. 1 power plant for however many hundred thousand cars. But yets, there are a lot more than a few houndred thousand cars.

As for the statistic, it was from a link I poster earlier in the thread:
http://en.wikipedia.org/wiki/Miles_per_gallon_gasoline_equivalent#2000:_Petroleum-equivalent_fuel_economy

It takes into account efficiences of many more steps of the process than just power to miles. They use grid efficiencies, power generation efficiences, influence of renewable enegry, and all kinds of things to make comparable numbers to the gasoline equivalent numbers. These are a lot of numbers that don't go on a window sticker, and the gasoline equivalent takes stuff like electricy to pump, refine, and ship gasoline on tankers.

It isn't the end all be all, but its one of the more accurate comparisons we have right now.
Quote:
PEF = Eg * 1/0.15 * AF * DPF
where:
PEF = Petroleum-equivalent fuel economy
Eg = Gasoline-equivalent energy content of electricity factor
1/0.15 = "Fuel content" factor or incentive factor. DoE selected this value to keep consistency with existing regulatory and statutory procedures, and to provide a similar treatment to manufacturers of all types of alternative fuel vehicles
AF = Petroleum-fueled accessory factor
DPF = Driving pattern factor
The gasoline-equivalent energy content of electricity factor, abbreviated as Eg, is defined as:

Eg = gasoline-equivalent energy content of electricity = (Tg * Tt * C) / Tp
where:
Tg = U.S. average fossil-fuel electricity generation efficiency = 0.328
Tt = U.S. average electricity transmission efficiency = 0.924
Tp = Petroleum refining and distribution efficiency = 0.830
C = Watt-hours of energy per gallon of gasoline conversion factor = 33,705 Wh/gal
Eg = (0.328 * 0.924 * 33705)/0.830 = 12,307 Wh/gal
PEF = Eg * 1/0.15 * AF * DPF = 12,307 Wh/gal/0.15 * AF * DPF
PEF = 82,049 Wh/gal * AF * DPF
    
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