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waiting for an hour mid-travel to charge your car vs. getting a full tank of gas in 3 minutes. no thanks.
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waiting for an hour mid-travel to charge your car vs. getting a full tank of gas in 3 minutes. no thanks.
Energy density is the amount of stored energy in something; in the case of gasoline we talk in America about a 1 gallon volume but I will use both metric and standard for the values. Gasoline has an energy density of about 44 megajoules per kilogram (MJ/kg), converted to American values that is 1.3 × 108 J/gallon. 3.61 × 106 joules is 1 Kwh and 1 Kwh can run a TV for about 24 hours. That means a gallon of gas contains the energy density to power your television for 36 straight days - in a comparatively tiny package. How large a battery would you need to run a TV for 36 days? Gigantic.
Cohen likens it to backpacking - anyone who has hiked or been in the military knows you want as much energy as possible in as small a space and weight as possible. MREs may not taste good but there is no question they pack a lot of calories in a tiny form factor. So it goes with gasoline. If 13 gallons of gasoline keep an entire car going for 400 miles at a high rate of speed, that is darn efficient energy density. It is also not easy to replace, not because we are 'addicted' to oil or because oil companies are buying up alternative fuel ideas and mothballing them.
It's plain hard to beat and progress is about making our lives better, not living in the dark and being happy about windmills. Hydrogen would be great but unless you have a fuel tank the size of a double-decker bus, it is not taking you 400 miles. And electric cars are risky unless the government spends trillions putting in electric stations every 10 miles. Ethanol was the last craze of the Anything-But-Oil contingent yet even they had to succumb to reality and recognize that the lower energy density meant 25% worse gas mileage - worse for people, worse for food prices and worse for the environment
You damn right b.There's no replacement for displacement
[h1]Inside Chrysler's Two-Mode HEMI Hybrid System[/h1]It's not possible to have hemispherical combustion...Nevermind.
In addition to electric assist, the second mode provides full power from the 5.7-liter HEMI[emoji]174[/emoji] V-8 when conditions demand it, such as when passing, pulling a trailer or climbing a steep grade. The two-mode programming integrates a host of technologies to improve efficiency including Chrysler's patented Multi-displacement System (MDS), standard on the 5.7-liter HEMI V-8. An elegantly complex design, the two-mode system also allows for more proliferate packaging via compact and powerful electric motors designed to fit within a conventional automatic transmission space — a clear efficiency advantage compared with today's typical single-mode systems that rely on much larger electric motors.Umm...thats a transmission..
This,Umm...thats a transmission..
that.Da HEMI block remains UNALTERED...
You said there is an electric hemi..no, da regular hemi runs ALONG SIDE electric motors that take turns powering da drive train.
Your ignorance knows no bounds."Oil companies" dont control anything.. Try OPEC...at least they used to.
Your ignorance knows no bounds."Oil companies" dont control anything.. Try OPEC...at least they used to.
Da combustion engine continues to get better, and you can change da rules of physics..
How efficient are combustion engines compared to an electric motor?Da combustion engine continues to get better, and you can change da rules of physics..
http://www.science20.com/science_20/energy_density_why_gasoline_here_stay-91403
Da combustion engine continues to get better, and you can change da rules of physics..
http://www.science20.com/science_20/energy_density_why_gasoline_here_stay-91403
How efficient are combustion engines compared to an electric motor?
Da combustion engine continues to get better, and you can change da rules of physics..
http://www.science20.com/science_20/energy_density_why_gasoline_here_stay-91403
How efficient are combustion engines compared to an electric motor?
Da fuel b....gas is much more energy dense.. Electric power cant beat it.
Electric vehicles are more efficient--and thus generally less polluting--than internal-combustion vehicles for a variety of reasons. First, because the electric motor is directly connected to the wheels, it consumes no energy while the car is at rest or coasting, increasing the effective efficiency by roughly one fifth. Regenerative braking schemes--which employ the motor as a generator when the car is slowing down--can return as much as half an electric vehicle's kinetic energy to the storage cells, giving it a major advantage in stop-and-go urban traffic.
Furthermore, the motor converts more than 90 percent of the energy in its storage cells to motive force, whereas internal-combustion drives utilize less than 25 percent of the energy in a liter of gasoline. Although the storage cells are typically charged by an electricity-generating system, the efficiency of which averages only 33 percent, an electric drive still has a significant 5 percent net advantage over internal combustion. Innovations such as combined-cycle generation (which extracts additional energy from the exhaust heat of a conventional power plant) will soon make it possible for the utility power plants from which the storage cells are charged to raise their efficiency to as much as 50 percent. This boost would increase proportionately the fraction of energy ultimately delivered to the wheels of an electric vehicle. Fuel cells, which "burn" hydrogen to generate electricity directly onboard an electric car are even more efficient.
You didn't answer my question.Da fuel b....gas is much more energy dense.. Electric power cant beat it.
How efficient are combustion engines compared to an electric motor?