Because now you have to establish a complex supply chain and potentially large worker base in a place that’s potentially quite inconvenient for both, instead of a much simpler supply chain and smaller workforce.
i'm not sure why you think that it is the case. if you want to make aluminum, you just need a ship to come in and pile up alumina, then take up piled up aluminum. the process is decently automated these days and you avoid making hydrogen. if you want to make ammonia, then all you need is hydrogen that you use as soon as it's made and nitrogen which is separated from air on demand. nitrogen fertilizers account for something like 2% of global primary energy use so it's probably decently scalable. then you can ship out liquid pressurized ammonia, or convert it to ammonium nitrate which again you can pile up. however with methanol you run into a Problem, because you need carbon dioxide, which means that you have to ship it from somewhere or capture in a massive installation. this immediately makes logistics of this entire enterprise harder. if you want to convert methanol to hydrocarbons then it takes some extra energy for little benefit (2x energy density) and some losses. to some degree, maybe it will make sense, but maybe it'll be easier to just build up renewables where people already live
in that scenario biofuels get to serve much smaller segment than today in the first place so maybe it's less of a problem. there are also things like biogas
I strongly feel that hydrogen is even more of a dead-end technology than these e-fuels. It is a right pain to store and transport and has rubbish energy density. There’s no future in the hydrogen economy. I’d bet we’re more likely to jump to artificial photosynthesis and fancy fuel cells than we are to see any substantial hydrogen infrastructure.
and you base that on what exactly other than vibes? there are applications where you need hydrogen directly as a reagent like ammonia synthesis, and these are probably most adaptable to this approach. methane is also proper PITA in terms of storage, yet we store it anyway because it's cheap as a fuel. if hydrogen is cheaper than that, then it will be used where applicable. it's easier to transport coal than electricity but not lignite; i don't know how it will play out with hydrogen, but either way you can imagine a situation where hydrogen is generated onsite, or within pipeline distance, and used immediately or maybe with some storage worth hours to days. this fits iron smelting (DRI) nicely, today the fuel used for it is methane because it's cheapest (process common in India). if hydrogen is cheaper than that, it will be used instead. other than that, applications where high heat is needed and where no electric heating can be used would be another use of hydrogen, like glassmaking and metal objects manufacture. hydrogen might be not disastrously bad option as fuel for transportation, because every step in manufacturing other fuels introduces losses; there are other tradeoffs
what do you want to fuel these fuel cells with? hydrogen is simplest option and most efficient (60% roundtrip efficiency or so). artificial photosynthesis is not a thing currently and strictly worse than combination of any energy source + conventional electrolyzer, because you have to combine not within single device but within single material something that will work as both. this also is only applicable to solar, not to wind or nuclear. some of these direct light to hydrogen schemes also only use UV only, and hydrogen is mixed with oxygen which is suboptimal, not to mention that main output of that work seems to be grant applications, while both electrolyzers and solar panels or wind turbines are available today, in bulk, straight from factory, and even more efficiently in decarbonization terms, these can replace coal-based electricity generation
regardless, main value of electrofuels today is in propaganda
regular process starting from gas has carbon dioxide as a byproduct, so urea is another option, but with hydrogen it would have to be provided. it's more expensive even today. maybe liquefied gas carrier could provide carbon dioxide and load ammonia on return leg, with some other dry cargo ship picking up that urea at some other time
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from bsky photos looks like entire gathering was 30 people. t h i r t y p e o p l e i might have counted some reporter or someone passing by randomly by accident
i think that business logic goes against your first point. spatially: if you have source of cheap energy and want to make money out of it, instead of making little money (by making fuel) why not make more money? (by setting there energy intensive manufacture) this seems to be current meta, with places like iceland and norway making aluminum and nitrogen fertilizers respectively. this can continue in other places and maybe extended to some other industries.
temporally (because there are also sunny and windy days when regular people won't consume all energy): this scheme requires cheap electricity, which is needed for cheap hydrogen. this requires massive renewables buildout, which means electricity is cheap for regular people, which means that every gas stove/heater and car will get replaced with electric ones, both residential and maybe perhaps faster for industrial users (more available loans). this means you have to reinforce transmission grid anyway. this also means cheap hydrogen, and because main input to its production is electricity, it makes more sense to use electricity when it's cheap. this means it's naturally suited to suck up all excess generation (both daily and seasonal), and also if electricity production is seasonal then so should be price of hydrogen. if price of electricity or hydrogen varies, then some industries can suck it up at greater rates when it's cheap. i'm thinking here of aluminum smelting (electricity input, daily variation, already done), or ammonia synthesis, or direct reduced iron smelting. i bet there's more. the point is, maybe you get to avoid storing hydrogen to some degree, because you can effectively store energy in finished or semi-finished goods. you can, for example, make some direct reduced iron and just store it when hydrogen is available, and then smelt it into steel in arc furnace when it's not. fertilizers are already sold in annual cycle and stored long term, and anyway ammonia is much easier to store than hydrogen. how it plays out will depend on energy/hydrogen costs vs storage costs vs capex for overcapacity costs. all together, i think this means that because of large amount of generation needed, you don't actually need to store energy this way at all, because when generation is low then electrolyzers turn off, and something will work at all times, probably. when you're able to do that, you won't need to
in terms of scale, first your lunch is eaten by EVs of various shapes, then by use of hydrogen for transportation (rocketry fits there), then you have to compete with biofuels (jet engine will take anything that burns without ash and can be pumped). then some of methanol will be used for fuel first, because it just works in engines and fuel cells, and it's a step before hydrocarbon synthesis. only then synthetic petroleum makes sense, this basically leaves some aviation (that won't use methanol) and military uses
i don't know if they started it. what i suspect as their contribution is bold claim that electrofuels might be cheaper than regular petrol in the glorious future, while currently they're much more expensive. (30x?) strict prerequisite for their competitiveness is cheap electricity, but at this point they're not needed. there was also Porsche owned wind power to methanol plant, and while methanol works as petrol replacement, all the plastics in contact with it must be resistant which is not a given. i guess the main value of it for them is propaganda, they're not ready for EV manufacture
the point is, as always, to continue doing business as usual (in this case, by inhibiting BEV adoption). that fuel is carbon-neutral but also extraordinarily wasteful. trump's deal is something called "clean coal", which isn't (it suggests carbon capture, but it's not a thing, they marketed normal emissions control like we have in europe as some unusually green innovation). i think he was also captured by gulf monarchies for the one hour when their representative talked to him
recently learned about electrofuels. it's a hypothetical rube goldberg scheme where you put enough energy to propel 5-7 EVs in, and pull out enough gasoline to fuel one car. it's sold as a green technology, because now gasoline is green somehow. this spin ignores that it would require massive buildout of renewables + nuclear, and just by doing this electrification of many energy end uses just makes sense, including transportation. (what the fuck is train??) it's also sold as a long term storage for renewables, but i struggle to see how scheme that has less than 30% roundtrip efficiency can be considered "storage". just build more renewables and don't use them all if needed
it's a complicated pr campaign by volkswagen group (and some other usual suspects). this is a nonexistent magic solution to a real problem, so it fits a common pattern (and also makes it stubsack material) that also attempts to shank electric vehicles adoption.
if anything, it's backwards because EVs are adopted faster than renewables buildout happens (cars last less than powerplants). if realized, this allows volkswagen group to manufacture regular cars for a long, long time even after oil refining stops. originally, it was proposed as a hypothetical luxury product for antique car owners, because it's physically possible, but doesn't make sense in energy or cost terms. but then someone spun it into potential regular retail good, and also maybe this pr campaign was a part of reason why internal combustion car ban was axed at eu level recently. now that it happened, they don't need to push it so hard
it is something ironic in there that last time this process made sense was in nazi germany, just this time source of syngas is different
there's a couple of amusing hells inside that job, you either have to deal with construction crews and contractors, jump between power poles including in cold and rain, wrangle with paperwork for permits for new lines, or fix horrors left by someone before you, it can be also dirty and people-facing
i still think that lots of people damaged by chatbots will stop in their tracks when this vc money burning charade ends, they won't be able to set up it all locally because chatbots brainrotted them even if it was possible in the first place
If you don't care about precise size, balls can be made cheaply by dropping drops of metal down tower where they are cooled by air as they fall, and then by water after they solidify. Then just sort by size
Ferrite beads allow you to use old calibration. If you make 1:1 balun just by threading coax through toroid, you can use old calibration as well provided it's the same coax. Keep in mind minimum bending radius of coax. There are other designs, like using twisted pair on toroid, then you have to include balun in calibration as well (it adds some electrical lenght). If you noticed changes after making air core, this suggests that you do have some common mode current, this will make your measurements sensitive to random changes as rf current flows on the outside of cable where it shouldn't
I've seen people using PE-Al-PE pipe for variables, this gives you layer of good dielectric (polyethylene) (but not as good as air) in dimensionally stable form. One connection is aluminum layer inside the pipe, and for the other you'll have to figure it out on your own. Retuning might be required anyway within the band (magloops are narrowband) Common way to make variables is to bolt two of them in series, so that no sliding contact is used, moving part is the same for both. This is good for high voltages also but i'm not sure if you'll need it
i'm not sure why you think that it is the case. if you want to make aluminum, you just need a ship to come in and pile up alumina, then take up piled up aluminum. the process is decently automated these days and you avoid making hydrogen. if you want to make ammonia, then all you need is hydrogen that you use as soon as it's made and nitrogen which is separated from air on demand. nitrogen fertilizers account for something like 2% of global primary energy use so it's probably decently scalable. then you can ship out liquid pressurized ammonia, or convert it to ammonium nitrate which again you can pile up. however with methanol you run into a Problem, because you need carbon dioxide, which means that you have to ship it from somewhere or capture in a massive installation. this immediately makes logistics of this entire enterprise harder. if you want to convert methanol to hydrocarbons then it takes some extra energy for little benefit (2x energy density) and some losses. to some degree, maybe it will make sense, but maybe it'll be easier to just build up renewables where people already live
in that scenario biofuels get to serve much smaller segment than today in the first place so maybe it's less of a problem. there are also things like biogas
and you base that on what exactly other than vibes? there are applications where you need hydrogen directly as a reagent like ammonia synthesis, and these are probably most adaptable to this approach. methane is also proper PITA in terms of storage, yet we store it anyway because it's cheap as a fuel. if hydrogen is cheaper than that, then it will be used where applicable. it's easier to transport coal than electricity but not lignite; i don't know how it will play out with hydrogen, but either way you can imagine a situation where hydrogen is generated onsite, or within pipeline distance, and used immediately or maybe with some storage worth hours to days. this fits iron smelting (DRI) nicely, today the fuel used for it is methane because it's cheapest (process common in India). if hydrogen is cheaper than that, it will be used instead. other than that, applications where high heat is needed and where no electric heating can be used would be another use of hydrogen, like glassmaking and metal objects manufacture. hydrogen might be not disastrously bad option as fuel for transportation, because every step in manufacturing other fuels introduces losses; there are other tradeoffs
what do you want to fuel these fuel cells with? hydrogen is simplest option and most efficient (60% roundtrip efficiency or so). artificial photosynthesis is not a thing currently and strictly worse than combination of any energy source + conventional electrolyzer, because you have to combine not within single device but within single material something that will work as both. this also is only applicable to solar, not to wind or nuclear. some of these direct light to hydrogen schemes also only use UV only, and hydrogen is mixed with oxygen which is suboptimal, not to mention that main output of that work seems to be grant applications, while both electrolyzers and solar panels or wind turbines are available today, in bulk, straight from factory, and even more efficiently in decarbonization terms, these can replace coal-based electricity generation
regardless, main value of electrofuels today is in propaganda
regular process starting from gas has carbon dioxide as a byproduct, so urea is another option, but with hydrogen it would have to be provided. it's more expensive even today. maybe liquefied gas carrier could provide carbon dioxide and load ammonia on return leg, with some other dry cargo ship picking up that urea at some other time