• 2 Posts
  • 73 Comments
Joined 1 year ago
cake
Cake day: June 8th, 2023

help-circle

  • shanghaibebop@beehaw.orgtoAsklemmy@lemmy.mlWhat Cars do You Swear By?
    link
    fedilink
    arrow-up
    3
    arrow-down
    2
    ·
    edit-2
    1 year ago

    Unpopular opinion, but Tesla model 3 has been the best car with the lowest total cost of ownership.

    Electricity is cheaper than gas by a lot, no moving parts or fluids to replace except washer fluid, brakes last forever since it’s Regen braking.

    It’s also pretty fun to drive.

    Not a fan of the dude, and never bought into the hype on the tech side, but it’s a solid car.










  • No, unless you are leveraging evaporative cooling, that amount of circulation isn’t going to get you much.

    Just get a real geothermal hvac system if you have the opportunity. Incredibly efficient.

    Back of the napkin conversion: 20btu/sqft recommended cooling capacity. 1btu = 252 calories (small)

    A 60k btu cooling needs

    15120000 gram degrees C of water. Assuming you have perfect heat exchanger on both ends, that’s 15120 liters-degrees circulated per hour.

    Pumping that much water alone is going to be quite a bit of energy.

    Then you have the problem of heat exchanger. There are lots of sizing mostly based on the deltaT temperature difference.

    Realistically, without some agent evaporating and recondensing, you’ll have a massive water to air heat exchanger that’s not practical at all.

    If you want to do more research yourself, heat exchanger sizing can be found in mechanical engineering and chemical engineering handbooks.




  • This was more or less a reflection of my personal experience.

    When I was in school, we were taught how to do research. It involves going to Libraries and looking for primary secondary and tertiary sources via the Dewey decimal system. We were taught how to use almanacs and even had an almanac competition on how fast someone can find information.

    Public institutions such as the Library system in the United States, were our “temple” of knowledge. Public support for Libraries was historically VERY high.

    However, since the popularization of search engines, it has radically reshaped our expectations of finding information. We expect to find it at our fingertip, in less than 200ms, at the cost of quality and gatekeeping institutions that filtered out a lot of junk knowledge.

    I was able to find a few articles talking about this: https://firstmonday.org/ojs/index.php/fm/article/view/2477/2279

    I especially love the quote, “Conflation of information retrieval with knowledge”