• JohnDClay@sh.itjust.works
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    1 year ago

    Hydrogen never really made sense for cars, the infrastructure and storage is too expensive. But I wonder if it’d work for trains that haven’t been fully electrified with overhead cables yet. You’d need much less infrastructure at just a few locations.

      • JohnDClay@sh.itjust.works
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        1 year ago

        How do battery operated work? Are they short rage trains? Or do they have like a car full of batteries? And how do recharge times work? Can they recharge just in the stations? If it works for them, great. And it sounds like it is. It just seemed like there were several problems.

        • Pxtl@lemmy.ca
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          1 year ago

          Battery locomotives don’t have enough range to be useful solo, but they’re a handy to add on to an existing train to give it regenerative braking and improve it’s efficiency.

          You want practically zero emissions train, you build overhead catenary wires. But that’s decades old tech that just works, it’s not sexy futuristic stuff.

          • JohnDClay@sh.itjust.works
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            1 year ago

            I was saying it seems to make sense to use hydrogen as an intermediate step before you can put in all the infrastructure for overhead wires. If Germany is just using electric engines plus diesel engines now, instead of hydrogen engines, then there’s still emitting a whole lot more than they would otherwise. Even if it is cheaper.

            • Cethin@lemmy.zip
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              1 year ago

              There’s no way Hydrogen in Germany would be more green than diesel. It’d just be greenwashing. You’d need to make electricity to make hydrogen, store it and transport it, then turn it back into electricity (that’s how a hydrogen engine works, not by burning it). In the mean time, Germany is increasing it’s production of dirty energy, so the hydrogen production would have to be done with dirty energy. There’s no way that process is more efficient than just using diesel directly.

              It might be better somewhere else, but not in Germany.

              • JohnDClay@sh.itjust.works
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                1 year ago

                You don’t need to use the standard grid energy. You can use off peak power rates in areas with a lot of wind, so it’d use the otherwise unusable energy. Or you could disconnect from the grid entirely. But the power source is absolutely a concern.

                What would the co2 trade off look like between diesel and hydrogen? Diesel you’d have a constant co2 per mile, whereas hydrogen would have higher kwh efficiency, but high conversion inefficiency, then some percentage of the energy emits co2 at a certain rate. I don’t have time to crunch the numbers now, but I would be surprised if hydrogen was more ghg intensive.

                • Cethin@lemmy.zip
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                  1 year ago

                  Or you could disconnect from the grid entirely.

                  The off peak usage, sure. This though? How would that be green? You could spend the same money to install solar, wind, whatever and take dirty energy off the grid. That’s the point is you need to use energy to make it, when instead that energy could remove dirty energy. It’s greenwashing. It’s not removing demand for dirty energy, its just increasing overall energy demand.

                  • JohnDClay@sh.itjust.works
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                    1 year ago

                    Increasing energy use compared to diesel? If you count the energy in the diesel, I’m pretty sure hydrogen would use less. But I think what matters over all is the total co2 emitted per mile, including generation.

          • BarelyOriginal@feddit.nl
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            1 year ago

            I don’t know, have you seen those wires above the rails? They always look sexy and futuristic to me, especially the high speed rail ones 🥵

    • Hypx@kbin.social
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      1 year ago

      Other than ideas like synfuels, it is the only thing that makes sense for cars. People are just falling prey to BEV propaganda. You don’t want unsustainable mining and a >400kg battery pack in every car. It is the big act of greenwashing today, and green transportation won’t happen until BEVs are abandoned or scaled way back.

      • JohnDClay@sh.itjust.works
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        1 year ago

        Unsustainable from a co2 standpoint, ecological damage, or human rights and damage standpoint? I think we’re probably thinking about different sorts of sustainability.

        • Hypx@kbin.social
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          1 year ago

          If you mean the cost of battery mining/production, it’s all three. We currently can’t even make batteries without vast amounts of fossil fuels. And due to many factors like long-duration energy storage problems, BEVs can’t reach net zero without hydrogen anyways.