Slashdot Mirror
The Development of Ecologically Sound Jet Fuel
Roland Piquepaille writes "Researchers at Princeton University are currently working on two projects to reduce jet travel's role in global warming. The first one, a major project funded by the U.S. Air Force with $7.5 million, is focused on developing computational models that accurately simulate the burning of jet fuel, a complex process not well understood today. The second one, funded by NetJets, a company providing business jets, will help to develop new jet fuels with near-zero net greenhouse gas emissions."
as long as they keep creating all those contrails that help keep the temperature down. we don't want to get rid of that.
It's hard to believe that's how Micronians are made. Why don't we see it right now by having you both kiss one another?
This is very, very costly and time consuming.
Exactly! I agree 100%! It's hard to do, so why even try?
"Tell me doctor, with all of your defenses, are there any provisions for an attack by killer bees?"
How is better public transportation going to decrease the carbon emissions when I fly from Atlanta to London in a month? The article is about improving the efficiency of Jet transportation, not cars. Those emissions effect the atmosphere much differently because they're injected at a much higher atmosphere.
-Bucky
If you can't justify the economics of doing so, most for-profit companies (especially the airlines, on razor-thin margins as it is) won't bother. You think any more people will fly because the jet they're traveling in makes them feel better about the environment? Think that'll offset the number who can't afford to fly anymore because their ticket price just quadrupled to afford retrofitting the entire fleet?
An "especially attractive feature" of processing coal and biomass together to make synfuels is that it requires only half the amount of biomaterial as pure biofuel production, while still making fuels with near-zero greenhouse gas emissions, Williams said.
If they're using 50% coal and 50% biomass won't the result will still be a hydrocarbon? In which case their actual CO2 emissions will be pretty much as normal, with around 50% of those emissions theoretically offset in the process of growing the biomass in the first place.
It's certainly not going to be anywhere near zero emissions unless they're proposing some way to filter the CO2 out of the jet exhaust.
Even a 50% reduction in net warming using this method seems unfeasible, because emitting greenhouse gases up in the stratosphere causes more net warming than emitting them on the ground, i forget the exact factor, I thinks it's estimated to be around 50% more. And that's still ignoring the fact that putting human beings and industry into competition for limited arable land resources is a horrible idea in the first place.
Maybe this is serious research and I'm just missing some important point, but it sounds horribly like airline industry FUD to me...
Seems likely to me this suffers from several serious problems:
(1) I can't easily believe it's more efficient. Granted, you use a fair amount of energy raising a jetliner to 40,000 feet, but it can't be that much, compared to what you need to use to keep it levitated and push air out of the way at 600 knots for hours and hours -- and a maglev train needs to do that, too. Indeed, air resistance is surely much higher on the maglev train, which has to operate near sea level instead of at the significantly lower air pressures in the stratosphere.
(2) You've got an incredible infrastructure problem. Essentially, you've got to build the entire Interstate highway system over again -- only this time it can't be just smooth concrete, it's got to be ultrasmooth, ultrastraight rails kept in alignment to the nearest micrometer along thousands of miles, in rain or shine, snow or mud or hurricane or flood, and with marvelous superconducting magnet windings all along them that have to be kept in absolutely perfect working order all the time, because you can't afford one small booboo in your levitation when you're flying along near the speed of sound 1.5 inches off the ground. I can't even imagine how you're going to switch maglev trains from one track to another while they're blistering along at 600 MPH. Those are going to be some very, very expensive switches.
Thing is, with airplanes you only need to build airports, and that's really only just laying down a big long strip of concrete and installing radar. You don't need to build much stuff between destination cities. You also don't need to lay down power along the entire route of every route they fly, because the motor goes along with the carriage.
(3) You've got an amazing safety issue. In the stratosphere there's not much you can run into at jet speeds, fortunately. But on the ground? Say a 50 pound rock falls off a rock face and dings the marvelous superconducting track, so that when the maglev train comes along 20 minutes later it hits a "dry spot" and the carriage dips down 3 inches and hits the ground at 600 knots. BOOM. You'd have to identify the passengers by DNA analysis of tiny bone fragments.
(4) Noise? I live next to a major rail line, and those things are noisy enough at 60-80 MPH. If they came by at 600, it wouldn't be possible to live within half a mile of the track. How does that square with the fact that most of the travel would be to and through major urban areas? Thing about airplanes is, except for within a few miles of the airport, you can't hear them because they fly two miles or more above us.