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You’d need huge cryogenic tanks due to the volume density of hydrogen over kerosene. Good for rockets that you can jettison tanks from, but less so for planes. I just don’t see it ever being practical for aviation over just creating our own hydrocarbons out of something else. Either catalyst based or otherwise. That’s potentially carbon neutral as well.
Edit: my comment, but with numbers https://pubs.aip.org/physicstoday/article/74/9/11/928294/Hydrogen-as-an-aviation-fuel It’s not a problem with how heavy the fuel would be or how much space they’d take. It’s how heavy the damn tanks would need to be.
Even if it takes more space, there are still benefits over biofuels.
The hydrogen can be created using electricity. Currently it is not very efficient, but only uses electricity and water. Electricity can come from de carbonated (/low carbon) sources.
And a fuel cell will use that hydrogen to generate electricity by combining the hydrogen into water with outside oxygen.
For the biofuel, it’s a big climate hoax. The issue with bio fuels, is that the energy required to produce them is huge. It required bacteria producing carbon emissions, and the fuel also produced carbon emissions. Whatever entered that plan, will get out, and even more because of the transformation. (i don’t remember which video from Undecided with Matt Ferell was about biofuels). Tho maybe it could be used for something. To get slightly less carbon emissions than with normal fuel.
There may also be a solution with batteries. However the energy density for them is lower compared to hydrogen. Tho, there may be some battery innovation I saw passing by which could be pretty interesting.
It’s no more of a problem than dealing with LPG, surely? Pressurise it for storage.
The difference is the ‘L’ in LPG. It turns liquid at a relatively low pressure and takes up much less space then. Hydrogen does not do that, so it has to be stored at a much, much higher pressure. For example, a medical oxygen bottle or a scuba tank has around 200 atm of pressure. For cars, hydrogen is usually stored at 700 atm. And the pressure inside an LPG tank is around 8 atm at room temperature.
I think it is, not sure but it requres bigger pressure and hidrogen is smallest atom that escapes even from high presure tanks.
You can’t keep liquid hydrogen by pressure alone and even as a liquid it’s volume density it’s very low compared to other liquids.
There was an article around here about Germany ditching hydrogen for their trains, which, if justifiable, seems damning for anything in the air.
As someone from Germany that’s the first time in reading that it was ever a thing for trains
Pretty much all our rails have electric lines on top and most trains are working electrically already
I really don’t see a point to waste hydrogen on cars or trains where pure electricity is working fine
Planes seems to be the main target that absolutely will never work electrically so it needs hydrogen - there even was an article about a ship running on batteries a couple of days ago
Germany just announced they will discontinue their hydrogen-powered train service in favor of a battery-based solution due to the higher running cost.
Hydrogen may be an alternative, but it has yet to make continuous, solid financial sense for any type of transport.
No… No, it isn’t… But you can imagine what it would be like if it was, right?
This is the best summary I could come up with:
A complete hydrogen fuel cell powertrain assembly occupied the pride of place in the pavilion of Beyond Aero at the recently concluded Paris Air Show.
That a fuel cell system was the Toulouse-based startup’s centerpiece at the biennial aero event is an indication of the steps being taken by a range of companies, from startups to multinational corporations, toward realizing the goal of using hydrogen as fuel in the aviation sector.
Even though in its current form, it serves only ultralight aviation, the successful test of the powertrain is a crucial step in our technical development path for designing and building a business aircraft,” Beyond Aero co-founder Hugo Tarlé told Ars Technica.
“The CS23 is a EASA (European Union Aviation Safety Agency) certification for small aircraft with a low Maximum Take-off Weight.
Speaking about the design challenges, Tarlé said mastering the characteristics of hydrogen and oxygen inside the fuel cell was a critical task.
Mastering the complexity of the cooling system is therefore critical,” he said, adding Beyond Aero has patented a solution in this regard.
I’m a bot and I’m open source!
Hydrogen sounds like a great idea for decarbonization until you get around to asking, “wait, where do we get the hydrogen from?” and realize that it’s incredibly energy intensive and the most popular process releases a lot of CO2 directly.
Last time I checked, CO2 released at that altitude has 3x the effect on radiative forcing, so it’s good that we’re not dumping it up there. I know water is also a greenhouse gas, but I expect the residence time to be substantially lower than for CO2. So it would be a net positive as long as we’re emitting on the ground the same amount of CO2 as emitted up there (we’re probably emitting more, but probably not 3x more and it would be easier to capture at the exhaust than from up there)
PS: more on radiative forcing factors here https://sustainable.stanford.edu/sites/g/files/sbiybj26701/files/media/file/s3-radiative-forcing-rfi-memo_public.pdf
Leaking hydrogen into the upper atmosphere sounds like a bad idea. It extends the life of methane, making the green house problem worse. I really hope that they reduce the leaking issue to a minimum.
But the short term profits!!!
The output is water, right? Wouldn’t this put more water vapor in the atmosphere? Because water vapor also increases the greenhouse effect.
However since water vapors also create clouds which reflect light it is definitely bettern than co2
Water doesn’t linger in the atmosphere like CO2, and so much water evaporates from the oceans that anything we could do to put more water in the air is negligible. The only real way we can influence the humidity of the atmosphere is by changing the temperature with carbon.
Hydrogen-powered planes almost ready for takeoff
No they aren’t, and they never will be (save for maybe a few small private one-offs). Certainly never for anything commercial.
That sounds like an incredibly bad idea.
Why?
Because hydrogen is highly explosive.
Hindenburg
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Bad idea? You don’t even know how it works. So please don’t comment your s* opinion.
What makes you think I don’t know how it works?
It’s a bad idea because hydrogen is highly flammable and explosive compared to jet fuel.
Hahahaha
You answered it yourself. You have no idea how these fuel canisters work. And not even how dangerous they are.
Hint : they are extremely safe even at high temperature.
