Technology @lemmy.world ArtikBanana @lemmy.dbzer0.com 1 wk. ago

Firebrick thermal energy storage could reach 170 GW in the U.S. by 2050

pv-magazine-usa.com Firebrick thermal energy storage could reach 170 GW in the U.S. by 2050

Firebrick heat storage technology, not batteries, will be used to store energy for industrial process heat in a 100% renewable energy system, says a study out of Stanford University.

Firebrick systems powered by renewable energy could be used for up to 90% of industrial process heat applications, the Stanford study says. Meeting that demand in the U.S. would require firebrick system capacity of 2.6 TWh, with a peak discharge rate of 170 GW.

13 comments

This seems like a stupid idea at first but it's actually amazing. They mix high resistance metals into the bricks so the bricks can conduct electricity and heat up while doing that. And then they blow air through the holes on the bricks to extract the heat whem needed. It leaks about 3% of the stored energy per day which is absolutely nothing considering it's cost

I'm gonna drop these papers here. First one is more of a brief intro and the second one discusses practicality and logistics of such systems

https://inldigitallibrary.inl.gov/sites/sti/sti/Sort_8882.pdf

https://www.sciencedirect.com/science/article/abs/pii/S0306261919305082
I would think molten metal would be more effective for this, molten sodium or lead or something? Maybe some kind of Tin/Lead eutectic like old solder?

Firebricks just seem inefficient somehow, particularly since the heat isn't going to be uniform, while molten metals or salts can circulate and convect the heat more efficiently than... air.
- The main advantage of using what is basically dirt is that it's dirt cheap. You need a metric fuckton of this stuff so the cheaper the material, the better. Also, molten metal is difficult to handle.
  
  Fine, but given ... everything, it seems like you could do some smaller system with channels in the bricks for conduction, it's the hot air that bothers me, that's not great to try to use for conducting energy everywhere, you get turbulent effects.
- Their previous study also goes into efficiency and cost.
  One of the main advantages of firebricks is their low cost.
  
  Ok, they're claiming 98% rt efficiency.
  
  I don't think we have 98% rt efficiency in anything, ever. That's miraculous. Batteries are around 92% at best? Pumped hydro is 85% or so.
  
  That even sounds high for raw carnot efficiency.
  
  I mean, if so, wow, that's awesome, and I don't really doubt their 1% daily decay, that seems attainable.
  
  But 98% rt? I'm still skeptical.
- I am not a material scientist, but I would wonder if molten metals would radiate too much heat to the environment causing an efficiency loss

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