4 ms·
> with the bottom layer being made of acrylic or other plastic that melts. Why is this bottom layer important?
by nextaccountic 1y ago
> with the bottom layer being made of acrylic or other plastic that melts.
Why is this bottom layer important?
- Scarblac 1y agoPresumably so that it melts in case of a fire, so that the sand falls down.
- deleted 1y ago[deleted]
- iokanuon 1y agoIf you don't have a bottom layer the sand will immediately fall
- iokanuon 1y agoActually thinking about it - why not have everything encased in sand all the time, you'd just have to be a kid playing in a sandbox when doing maintenance
- lukan 1y agoBecause sand everywhere is kind of annoying? And dangerous for any moving parts?
- IAmBroom 1y agoVery few moving parts in most batteries.
- lukan 1y agoBut batteries are often close to machines in need of energy. And even walking with sandy hands to the sink to wash then, will spread sand. Also some batteries have active cooling. But a home installation might be done in a way that it is managable though.
- mschuster91 1y agoHeat management. A battery that's surrounded by air can cool itself by convection. A battery that's buried in sand will eventually reach thermal saturation with the sand... at a temperature that it really really should not be at.
- f4c39012 1y agolike in Minecraft
- arghwhat 1y agoIf the batteries catch fire the acrylic bottom will melt and automatically dump the sand onto the fire. This is a questionable setup though. You'd need massive amounts of sand dumped evenly, which requires more design and verification. Acrylic is also itself flammable. A basic water based fire suppressor would not extinguish a battery fire but it will cool it and the room, limiting spread. Let the experts design this kind of thing.
- Etheryte 1y agoDo not use water to try and put out a battery fire. It's not as bad as throwing water on burning oil, but it's not far from it.
- arghwhat 1y agoBattery fire suppression systems often use water, and firefighters will also certainly apply water. Just don't walk up to the cell with a bucket of water. Water can and is used to cool batteries during battery fires, and more importantly, to cool the surroundings so that the fire cannot spread to, say, neighboring banks/cells or construction materials. Modern EV fire suppression systems for parking garages use high-pressure water mists to avoid the fire spreading to neighboring vehicles for example. The recommendation about oil and water focuses on a larger container of liquid fuel that is on fire at the surface and heated far past the boiling point of water, such that dumping a large volume of water onto it all at once causes it to immediately boil and explode, spreading large amounts of oil as a mist in the air, which both spreads the fire and causes a much more violent combustion. A water-based fire suppression system (not a guy with a bucket of water), or a firefighter with a water hose, can absolutely extinguish such a fire. Hacking together a sand container of acrylic may well do nothing to limit the fire while simultanously giving it more fuel (acrylic) and pathways to spread to (whatever the acrylic is near). The point is: Don't hack together a fire suppression system, leave that to an expert please.
- mschuster91 1y ago> A basic water based fire suppressor would not extinguish a battery fire but it will cool it and the room, limiting spread. That's the thing: it will not, quite the contrary - unless it's many tons of water at once that quench the fire, the burning lithium will just go and create hydrogen gas that in turn recombines and leads to an even larger fire.