Except the fact that the movie missed the increasing levels of hostility and aggression, it's kind of spot on. The movie is often described as a dystopian comedy, I think it's kind of utopian, compared to where we're actually heading.
The invention of the fuel cell doesn't just predate li-ion batteries, the fuel cell was actually invented well before the first rechargeable battery was invented. Also, 60% efficiency, that is, "just"40% loss, in conversion from hydrogen to power alone requires a humongous fuel cell system, relative to the power generated, it's not really realistic to achieve that for propulsion, not even on trains. And, at "just" 350 bars you get less than 24 grams of hydrogen per liter of tank volume, and assuming a very generous real world average efficiency of 50% from hydrogen to power, you need about 2.5 liters of tank volume per kWh of usable energy out of the fuel cell system. And that means the hydrogen tanks alone are much more expensive than batteries, for a given amount of usable energy. When you add the gas tanks own volume, and the fact that the tanks has to be cylindrical, or spherical, the tanks requires more than 5 cubic meters of space per MWh of usable energy out of the system, which is worse than some relatively cheap LFP-batteries. And that's the hydrogen tanks alone, the space for the fuel cell system, and auxiliary systems it requires is on top of that. Batteries could relatively easily and safely be distributed in places where they don't compete with useful payload capacity, on multiple train cars of so required. Storing hydrogen is actually an surprisingly complicated matter, besides the high pressure required to store any meaningful amount of hydrogen, hydrogen tends to cause hydrogen embrittlement. And then there the fact that emptying and refilling tanks frequently can cause fatigue, unless you go crazy with wall thickness, or use stainless steel, also expansion and then the compression of gas in the tanks when refueling can cause really extreme temperature changes, which isn't good for composite materials. With steel tanks you won't even have a weight advantage compared to batteries. And it's not like hydrogen trains or buses is an unexplored idea, there have been many multi million dollar projects that all have show that the cost is astronomical, and there's a wide range of very severe practical issues. When projects with buses always have shown that the cost at that scale is astronomical, it takes a special kind of genius to conclude that 20 times (or there about) higher power requirement would make it practical.
I love that Germany actually shared all their research publicly {if u can find it } and the head line was clear but my country is like what if we burn money that we do not have 😁😁😁 5d chess move
May be we can use battery coach (one whole coach for battery) than we have to just joint coach behind train and just change it on station. Another question- can we use railways power line for interconnect the grid ...?
day by day idiocracy movie doesnt feels like fantyacy feels like future prediction
Ouch
Except the fact that the movie missed the increasing levels of hostility and aggression, it's kind of spot on. The movie is often described as a dystopian comedy, I think it's kind of utopian, compared to where we're actually heading.
The invention of the fuel cell doesn't just predate li-ion batteries, the fuel cell was actually invented well before the first rechargeable battery was invented.
Also, 60% efficiency, that is, "just"40% loss, in conversion from hydrogen to power alone requires a humongous fuel cell system, relative to the power generated, it's not really realistic to achieve that for propulsion, not even on trains.
And, at "just" 350 bars you get less than 24 grams of hydrogen per liter of tank volume, and assuming a very generous real world average efficiency of 50% from hydrogen to power, you need about 2.5 liters of tank volume per kWh of usable energy out of the fuel cell system. And that means the hydrogen tanks alone are much more expensive than batteries, for a given amount of usable energy. When you add the gas tanks own volume, and the fact that the tanks has to be cylindrical, or spherical, the tanks requires more than 5 cubic meters of space per MWh of usable energy out of the system, which is worse than some relatively cheap LFP-batteries. And that's the hydrogen tanks alone, the space for the fuel cell system, and auxiliary systems it requires is on top of that. Batteries could relatively easily and safely be distributed in places where they don't compete with useful payload capacity, on multiple train cars of so required.
Storing hydrogen is actually an surprisingly complicated matter, besides the high pressure required to store any meaningful amount of hydrogen, hydrogen tends to cause hydrogen embrittlement. And then there the fact that emptying and refilling tanks frequently can cause fatigue, unless you go crazy with wall thickness, or use stainless steel, also expansion and then the compression of gas in the tanks when refueling can cause really extreme temperature changes, which isn't good for composite materials. With steel tanks you won't even have a weight advantage compared to batteries.
And it's not like hydrogen trains or buses is an unexplored idea, there have been many multi million dollar projects that all have show that the cost is astronomical, and there's a wide range of very severe practical issues. When projects with buses always have shown that the cost at that scale is astronomical, it takes a special kind of genius to conclude that 20 times (or there about) higher power requirement would make it practical.
I love that Germany actually shared all their research publicly {if u can find it } and the head line was clear but my country is like what if we burn money that we do not have 😁😁😁 5d chess move
May be we can use battery coach (one whole coach for battery) than we have to just joint coach behind train and just change it on station.
Another question-
can we use railways power line for interconnect the grid ...?
u dont want to dock or undock coach too many steps & nope those are built for train and too little power
conclution: hydrogen tech takes away your paneer roll🤣🤣
LOL