Disney teen-pop group the Jonas Brother coming to Omaha in July
Disney teen-pop group the Jonas Brothers bring their “Burning Up” summer concert tour to the Qwest Center Omaha on July 21.
Tickets go on sale to members of the group’s fan club on March 25 and to the public on March 29. Prices have not yet been announced.
The sibling group, which has a new album coming out in August, performed in Omaha last fall with fellow Disney sensation Miley Cyrus of “Hannah Montana” fame.
Tags: brothers, club, fan, jonas
youtube clips on cnn or it didnt happen.
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Well I use the term “gas station” to refer to somewhere you fill up your car, it was meant as a generic term.A “car refill station” could simple be a gas station that has bought a industrial compressor.You could of cause fill the car up at home, but without a industrial compressor it would take much longer.
The calculation about the energy content is correct, but you are making the wrong assumption: the compressed air is just a means to temporarily store energy from braking and reuse it on acceleration. During a trip, this goes through multiple cycles - your caculation would be correct if the energy would be used just once.I just compared the energy content of the compressed air (9.2 MJ according to your calculation) with that of the battery of my Prius (which serves the same function as the compressed air in the ZPM): 273.6V, 6.5Ah makes just 6.5 MJ.
The car does have the potential to be quite efficient. While you are right that most of the energy comes from the gasoline the key is how efficiently you use it. By heating the compressed air, you are turning the car into a heat engine. However, The otto cycle (the thermodynamic cycle your car uses) becomes more efficient the more one compresses the air before it is heated. After it is heated it is allowed to expand and useful work is extracted. Since the air is coming from a tank there is the potential for a huge increase in efficiency outside of the energy stored in the compressed gas. For example, if they stored the air in the tank at 5000 psi, this corresponds roughly to a compression ratio of 350!. The ideal efficiency of an Otto engine with this compression ratio is 90%!! A typical gas engine has a compression ratio of 7 to 10 with an ideal efficiency of 50 to 60%. Combined with regenerative breaking, the energy already stored in the tank (its relatively small I know) I don’t find it hard to believe that a car like this could get 100 mpg or go 800 - 1000 miles on 8 gallons of gas. Mind you this is a huge leap in efficiency for high, not just city. Such a leap in efficiency really is revolutionary if they can pull it off.A secondary benefit of such an engine is that it could use external combustion. There would be no need to use gasoline you could use wood chips if you wished. In this manner the car can indeed be “carbon neutral” since it is possible to use biofuels that don’t require extensive processing (read: energy) to be ready to use in an internal combustion engine. author shakes fist at ethanol So when they are ambiguous about the fuel necessary it is for a reason.All in all it is a brilliant idea, especially if they can couple a compressor to the engine to alleviate the need to travel to a special “compressor station”.The one down side is the behavior of compressed air in an accident. If the tank is for some reason breached or compressed a tremendous amount of energy is released in the explosion and without the need for a spark. I don’t think that is terribly easy to do though.Here are the equations I used from “Introduction to Fluid and Thermal Engineering” by Kaminski and Jensen:Efficiency for ideal otto engine:efficiency = 1 - 1/(r^(1-k))where r is the compression ratio and k is the ratio of specific heat at constant pressure to constant volume (1.4 for air is a good estimate for most conditions).