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Barcelona is turning subway trains into power stations (grist.org)

submitted 2 months ago by jeffw@lemmy.world to c/technology@lemmy.world

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[–] doczombie@lemmy.world 6 points 2 months ago (1 children)

They do... 1/3rd of it is used that way.

[–] wewbull 23 points 2 months ago (3 children)

Leaving the train at 1/3rd the speed it decelerated from?

What's really happening:

Barcelona want to use regen braking to reduce power usage of their metro - this is good.
Adding batteries to store all that energy for 30seconds at each stop is impractical in some way. It makes the train too heavy / They can't charge quick enough / The charging loss is too high. So, they go for a smaller battery.
The electrical grid gets the rest of the energy dumped into it, only to supply it back to the train when it accelerates again. They use the grid like a battery.
Some public relations person heard this and issued a press release - "Barcelona using metro as power station".
Every engineer working on the project simultaneously groans in despair. The resulting low frequency wave shakes the foundations of Sagrada Família, setting the construction back another generation.

[–] GamingChairModel@lemmy.world 3 points 2 months ago (1 children)

The resulting low frequency wave shakes the foundations of Sagrada Família, setting the construction back another generation.

Ay, ¡qué lástima!

[–] Railcar8095@lemm.ee 0 points 2 months ago

I'm still not paying a full ticket, I'll wait until I can see a whole basilica.

[–] billiam0202@lemmy.world 2 points 2 months ago

Every engineer working on the project simultaneously groans in despair. The resulting low frequency wave shakes the foundations of Sagrada Família, setting the construction back another generation.

Are we sure the Sagrada Familia isn't a source of perpetual energy?

[–] scarabic@lemmy.world 1 points 2 months ago

If they ever finish SF it will kind of feel wrong.

But I guess there have been generation projects in the past. They Pyramids, etc.

We just finally get to see what one feels like.