Auto De Nitrogeno Liquido
Enviado por EARR • 17 de Octubre de 2013 • 319 Palabras (2 Páginas) • 361 Visitas
CRYOCAR
What is a Cryocar?
It is a liquid nitrogen powered vehicle.
Propulsion systems are cryogenic heat engines in which a cryogenic substance is used as a heat sink.
Cryogenic Heat Engine
It is a engine which uses very cold substances to produce useful energy.
There is always some heat input to the working fluid during the expansion process.
Liquid Nitrogen(LN2)
Liquid Nitrogen is the cheapest, widely produced and most common cryogen.
It is mass produced in air liquefaction plants
The liquefaction process is very simple.
Normal, atmospheric air is passed through dust precipitator and pre-cooled.
It is then compressed inside large turbo pumps to about 100 atmospheres.
Once the air has been cooled to room temperature it is allowed to expand rapidly through a nozzle into an insulated chamber.
By running several cycles the temperature of the chamber becomes low enough. The air entering it starts to liquefy.
Liquid nitrogen is removed from the chamber by fractional distillation and is stored inside well-insulated Dewar flasks .
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.
Principle of Operation:
LN2 at –320oF (-196oC) is pressurized and then vaporized in a heat exchanger by ambient temperature of the surrounding air.
This heat exchanger is like the radiator of a car but instead of using air to cool water, it uses air to heat and boil liquid nitrogen.
Liquid N2 passing through the primary heat exchanger quickly reaches its boiling point.
The N2 expands to a gas with a pressure of 150 psi.
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