3 ms·
> the weight of high pressure tanks goes up with their surface area while the energy stores goes up with volume. Nope, tank mass scales with volume because big
by eternauta3k 5y ago
> the weight of high pressure tanks goes up with their surface area while the energy stores goes up with volume.
Nope, tank mass scales with volume because bigger tanks need thicker walls: https://en.wikipedia.org/wiki/Pressure_vessel#Scaling https://en.wikipedia.org/wiki/Pressure_vessel#Scaling
- abakker 5y agoWith hydrogen this is especially problematic due to hydrogen embrittlement. https://en.wikipedia.org/wiki/Hydrogen_embrittlement https://en.wikipedia.org/wiki/Hydrogen_embrittlement
- semi-extrinsic 5y agoNope, because you don't make hydrogen tanks out of materials that are susceptible to hydrogen embrittlement. In particular, pressurized automotive-size hydrogen tanks aren't made from metal at all, they are typically epoxy/kevlar/carbon fiber composites.
- abakker 5y agoOOC, since you know what these tanks are made out of, what is the duty cycle/lifespan of those tanks? I was presented some info on Kevlar tanks for drones using fuel cells and remember thinking that the lifespan was very short.
- samplatt 5y agoAnything bound by epoxy (or any polymer?) surely will have a comparably short lifespan...
- semi-extrinsic 5y agoToyota certify and guarantee their tanks for 15 years, in production cars that you can go out and buy today.
- Mvandenbergh 5y agoRight you are!