19-07-2014, 02:44 PM
CRYOCAR
CRYOCAR.pptx (Size: 751.06 KB / Downloads: 38)
Main Components of the Engine:
A pressurized tank to store liquid nitrogen.
Pressurant bottles of N2 gas substitute for a pump. The gas pushes the liquid nitrogen out of the Dewar that serves as a fuel tank.
A primary heat exchanger that heats (using atmospheric heat) LN2 to form N2 gas, then heats gas under pressure to near atmospheric temperature.
An Expander to provide work to the drive shaft of the vehicle.
An economizer or a secondary heat exchanger, which preheats the liquid N2 coming out from the pressurized tank taking heat from the exhaust.
A liquid nitrogen car is much lighter and refilling its tank takes only about 10-15 minutes.
The exhaust produced by the car is environmental friendly.
A cryogenic car could have three times the range of an electric car of the same weight and no battery disposal concerns .
Drawbacks:
The N2 passing through the tubes of the heat exchanger is so cold that the moisture in the surrounding air would condense on the outside of the tubes, obstructing the air flow.
Then there's the safety issue. Should a nitrogen car be kept in a poorly ventilated space and, if the Nitrogen leaks off, it could prove fatal.
Turning N2 gas into a liquid requires a lot of energy. So while cryogenic cars have zero emissions, they rely on energy produced at emission generating power plants.
Probable Solutions:
A tube within a tube design.
N2 passes back and forth inside a set of three nested tubes.
By the time it reaches the outermost tubes, the N2 is warm enough that the exterior wall of the tube remains above the freezing point of water.
Route the exhaust from the fossil fuel power plants through cryogenic plants, so that the pollutants and the greenhouse gases could be condensed for later disposal
Conclusion:
In a real sense, the more such vehicles are used, the cleaner the air will become.
In addition to the environmental impact of these vehicles, refueling using current technology can take only a few minutes, which is very similar to current gas refueling times.