this post was submitted on 05 Jul 2024
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Hydrogen is so much smaller than natty light that on a Continental scale the losses could be significant, but that's neat history. It's fun how long stuff has been around like gasification.
From all that I've seen electricity lines (also HVDC) have higher transmission losses by a magnitude. With hydrogen and modern material science you'll probably have the choice between higher losses and embrittlement, but that's just another economical equation: Do you want to eat the higher losses, or replace the pipeline in a couple of decades or a century.
At least environment-wise hydrogen leaks aren't an issue: Some atoms diffusing through the wall don't constitute a fire hazard and the end result is water. Methane, OTOH, is a nasty greenhouse gas.
Speaking of nature: Ammonia is nasty, but nature produces it itself (just not at those concentrations) and can deal with it. The site directly surrounding a leak would be dead, a bit further downstream (literally) there's going to be over-fertilisation. Not nice but definitely better than an oil leak and fixing it quite literally involves waiting until grass has grown over it as rain dilutes it and microorganisms migrate back in to eat it. Similar things apply to ethanol which I'd say would be a better choice for general use such as hybrid cars, camping stoves and whatnot because it's not going to burn your lungs away. Can't rely on people being conscious enough to get up and flee the ammonia stench when they're in a car accident.
Probably true since transmission loses come after engine losses. Ammonia is also pretty cool though, I've read about the idea of using it in big engines since it's also easy to store/make.
Hydrogen is a strong indirect greenhouse gas.
The climate impact of hydrogen is about 34 times higher than CO2 when measured over a 20-year period. Looking at the impact over 100 years, the global warming potential reduces to between eight and 13 times.
Hydrogen causes this by stabilising methane in the atmosphere and creating tropospheric ozone and stratospheric water vapour.
https://www.euractiv.com/section/energy-environment/news/scientists-reiterate-concerns-about-climate-warming-hydrogen-leaks/
We shouldn't be having methane in the atmosphere in the first place. Sure, if you produce the hydrogen from natural gas then you have a problem because that stuff comes with plenty of methane which won't suddenly stop leaking.
Ha. So we are banning farmers from owning livestock
Also if you inject hydrogen into the existing natural gas pipeline.
The point here is that hydrogen leaks are very much an issue. Your previous statement was false.
Noone here is planning to inject hydrogen into existing pipelines. If anything, synthesising methane during the transition so that consumers only have to switch their burners once, from nat gas to hydrogen, and not first to nat gas + more hydrogen and then to pure hydrogen. Gotta switch whole municipalities at once doesn't make sense to duplicate the last-mile gas pipes. If, and that's not even clear yet, hydrogen pipes will even be a thing for private consumers.
Ok. Not you. But lots of people elsewhere in this thread.
Agree. Burning hydrogen has to be done carefully to avoid NOx and other side effects.
Agreed.
Industrial green hydrogen is a necessity to remove fossil fuels. Residential hydrogen I am very sceptical about. Even 100% clean fuel cells burn too hot for domestic heating.