Car powered by compressed air?

Kerosene is a popular rocket fuel. Hydrogen is hard to handle.

John

That is what you mix with the air and put into the engine each time the piston drops when the intake valve is open.

You seem to have a problem with basic premises.

LN2 has been tried, at about 200kJ/kg

What do you think of this:

Air hybrid cars could halve fuel consumption Researchers are exploring air hybrid automobiles as possible alternatives to electric hybrid cars, claiming they could be more efficient and less expensive to manufacture.

"My simulations show that buses in cities could reduce their fuel consumption by 60%", said Sasa Trajkovic, a doctoral student in Combustion Engines at Lund University who recently defended a thesis on the subject. Trajkovic adds that 48% of the brake energy, which the technology compresses and saves in a small air tank connected to the engine to be reused later. This means that the degree of reuse for air hybrids could match that of today's electric hybrids.

Maybe they should have waited to publish it on 1 April!

What happens if you leave it in the garage for the weekend? Where does the boiloff hydrogen go?

John

You only fill it for each trip, idiot. The fill level is enough for the trip. Pretty simple.

Uh, where do you get the liquid hydrogen to fill it? Do you keep it in a dewar in the front yard? Or do you tow the car to the nearest Chevron Hydrogen station?

If you load more than you need for the trip, do you vent the excess before you push the car into the garage?

Do you do all of that every day?

You haven't thought this out.

John

Tsar Nicolas II et Jules Bonnot had an automobile that was started using compressed air:

"Sur demande spéciale, elle est équipée d'un démarreur à air comprimé qui lui permet de se mettre en route sans aucun bruit pour ne pas effrayer les chevaux lors des revues militaires."

Actually, stopping and re-starting the engine could decrease fuel usage in start-stop usage. Compressed air is not the way to do this however. Even the common lead-acid battery, a high speed flywheel or even a wound spring might be better. (It might scare the horses!)

You are an idiot. It is very easy to fill a small pressure vessel from a larger one or from a large dewar. When you return home, you put the remains in the surge tank that the compressor uses to fill the main vessel. The same compression system that takes the low pressure separated gas and compresses it into LH.

That loony dude posted pics of a device that extracts and collect LN2 from a little sterling engine or such. That same principle can be adapted to the gathering of Hydrogen gas.

Get off your horse, John.It doesn't matter if it is the most efficient per unit volume. It BURNS. and IT IS ABUNDANT.

If it's so easy, I'm sure your car runs this way already.

Show us some pics.

John

There are two flavors of hydrogen, ortho and para.

The one degrades into the other just by sitting around for a while.

Ok, but wouldn't LH2 already be para (lowest energy), with the conversion done in the manufacturing process?

We prefer the parawater, the one that comes in green bottles from Italy.

John

A lot better than that stuff from Ortho.

You are going to have a 10,000+ PSI compressor in your garage?

Best regards, Spehro Pefhany

The tanks on the shuttle main engine are not high pressure tanks.

Who other than you ever said a damned thing about 10,000 psi compression?

I thought we were discussing using liquid hydrogen. He'd need a cryo plant. If he used gaseous H2 at 10K psi, there would be no boiloff and he could park indoors.

But even CNG tanks on vehicles blow up now and then, at lower pressure.

Cool video:

John

The shuttle's main tanks would vent into your garage, moron.

Compressed hydrogen. Do try to think, AlwaysWrong.

That's the only way to turn gaseous Hydrogen into liquid at room temperature.

Best regards, Spehro Pefhany