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The Physics of the Hydrogen Economy
Spy der Mann writes "A Physics Today article entitled The Hydrogen Economy explores the possibility of using hydrogen as an energy source. The article explores the current methods, limitations, and the need for more research. For those wanting to point out the Hindenburg incident, the article doesn't talk about gaseous hydrogen only, but also about hydrogen fuel cells. My favorite quote: 'The natural world began forming its own hydrogen economy 3 billion years ago, when it developed photosynthesis to convert CO2, water, and sunlight into hydrogen and oxygen'. Interesting read for eco-fans."
A friend and coworker was describing a scene he witnessed at a plant that liquifies gasses. You figure out which one.
One of his coworkers was pushing a metal cart loaded with a test rig down an aisle. About halfway down there was a huge *whump* that echoed down the hall and the entire front half of the cart was in flames. The man wasn't seriously injured, even being so close to a tremendous fire.
A H2 pipeline had ruptured (H2 embrittlement I think he said) and was spewing a steady stream of the material in a jet across the walkway. Somehow it had caught fire and, since H2 burns colorless no one saw it.
Had that cart not been there.... ouch.
Is it just me, or should there be a distinction between "energy source" and "fuel?" If you burn gasoline, hydrogen is still the component providing the energy. So talking about using pure hydrogen versus hydrogen bound up with carbon (and other atoms) is a difference in fuel makeup than the energy source.
Or so it seems to me...
The Spoon
Updated 6/28/2011
Hydrogen is a Boondoggle. The energy density is so low, that we might as well use batteries if we're going to power vehicles with it. (It may be good for stationary purposes.) If we really wanted to, we could convert all US vehicles to diesel, and run them all with Algae-Derived Biodiesel using sewage as a feedstock. Because of the greater efficiency of algae, supplying all of our vehicular needs is actually feasible.
This would alleviate both the global warming problem and our dependence on Middle-Eastern petroleum. The technology is available now, and because of the high energy density, no sacrifices on the part of automotive consumers are required in terms of range and performance. (We may need to invest in research into better catalytic converters and turbocharging technology.)
1. Huge vast amounts of Free Energy, courtesy of plate tectonics.
2. They are completely surrounded by all the water they could ever want.
All you have to do is drill down to the heat, use it to boil water to spin turbines, which then make electricity to crack the water to make the hydrogen. Done.
You heard it hear first. The amount of energy under Iceland and the Big Island is *insane*. Another good place to drill for heat would be the supervolcano at Yellowstone. Use the electricity generated there and you can pump in the water from most anywhere and crack it into H2. Also: by draining off some of the heat from the supervolcano, we might be able to prevent (or slow) the eventual eruption of that sucker.
Problem solved. Next?
HW
Shoes for Industry. Shoes for the Dead.
This reflects a profound ignorance of the way that technological progress works.
If you told someone in 1880 that the New York of 2004 would have a population of 8 million that would have said, "that is totally impossible! Do you have any idea how much horse manure a city of 8 million people would produce?"
Likewise, the 1880 individual would not believe that individual transports capable of routine travel at a 100kph would be possible. They would say, "Do you have any idea how much coal each vehicle would have to burn! Millions of such vehicles not only consume all the worlds coal but would blanket the entire planet in a cloud of soot!"
The more advanced the technology the less energy it takes to perform an equivalent task. A light bulb produces less waste heat to produce the equivalent lumens than does an open flame.
"Conserving" energy just means condemning the majority of humanity to needless suffering and death. The real solution is to keep creating technologies that provide greater benefit to more people with decreasing environmental impact.