• 1 Post
  • 824 Comments
Joined 1 year ago
cake
Cake day: July 7th, 2023

help-circle






  • Not who you responded to, but that’s an interesting source. I’m intrigued by a textile company claiming to be experts in lithium ion fires.

    It sounds more like options for preventing a fire to spread. It’s also including CO2 extinguishers under “foam” which they very much aren’t, making me doubt the rest of their blog post.

    Extinguishing fires can work largely in two different ways. Either by smothering a fire or by cooling a fuel below it’s flash point. Quite often they put out a fire by doing both. A fire that contains an oxidizer cannot be smothered, but smothering can help prevent other materials in a vehicle from being able to burn along with the batteries. Cooling down a large, vehicle sized lithium ion fires takes an incredible amount of water. However, the cells themselves contain so much energy that their failure produces more thermal energy than water is able to remove.

    Is water the best to put out large EV fires? Nope.

    Is water good at preventing fires from spreading? Yep.

    Is water easily accessible and carried on every fire truck and engine and available through hydrants? Also yep.

    A lot of agencies are including car sized fire blankets as well that help smother the fire some and make burnt/burning EVs safer for tow trucks to move to a safe locations where they can be left to burn out. Sometimes for over a month! You might see fire engines literally escorting tow trucks because even with the blanket and being doused with tens of thousands of gallons, it’s still at risk of reigniting during transport.

    The other big issue that agencies are facing with EV fires is that the water used to suppress these fires essentially becomes hazmat. So there are issues with letting it just run off into the storm system or the environment.









  • Mine is alright, it doesn’t mao the room but kind of finds the perimeter and start to just do lines back and forth. It’s nice to vacuum when I leave the house.

    It’s loud, but at least it’s doing something if only evidenced by how much I empty the damn thing. Every couple months I have to take it and the dock out to the garage to blow it all out with their air compressor.

    I do think it makes me keep shit off the floor more. It wants to eat cords a lot. I want a second one with mapping so I can have it do specific rooms and this one can get sent to the basement where it doesn’t need to be as fancy.

    I really hate the space it takes up, I would love one that was shorter so it could be stored underneath the side tables, or the dock and empty bin were flatter so it could be under the couch or something.




  • brygphilomena@lemmy.worldtoLemmy Shitpost@lemmy.worldCandid Picture
    link
    fedilink
    arrow-up
    6
    arrow-down
    1
    ·
    edit-2
    10 days ago

    When a student goes to school, the school becomes in loco parentis and the student doesn’t have protection from school officials. Children, on campus, general do not have protection for free speech, protection from unreasonable searches or seizures, or really any of their rights.

    The school, acting as parents, can restrict their speech, search their bags, and confiscate contraband.

    The school can even waive most of the child’s rights even when dealing with law enforcement until parents arrive.