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Thermal image of a road that was just repaved (thelemmy.club)
submitted 4 months ago by to c/mildlyinteresting@lemmy.world
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I could feel the heat coming off it when I stood next to the repaved section. They didn't repave the parking area at the edge. Opened to traffic again, seems firm enough to drive on at 160⁰F.

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[–] 8 points 4 months ago (2 children)

I'm not sure if you're being deliberately misleading. I'll just assume you've never owned a somewhat new-ish ev. None of those with active cooling use the outside air, almost as follow this kind of layout:

The circled part is the important one. Hell, even the first Gen ioniq which had an air cooled battery drew in chilled air from near the rear passenger ducts.

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  • [–] -3 points 4 months ago (2 children)

    If the car isn't using outside air for cooling, where is the heat going?

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  • [–] 6 points 4 months ago (1 child)

    Based on the image they shared, the heat goes into the refrigerant, which then goes to a radiator to transfer into the outside air.

    It doesn't use outside air in the sense that the battery doesn't transfer heat directly to the outside air. There's the refrigerant between the two.

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  • [–] -1 points 4 months ago (1 child)

    Right, that's what I'm getting at. The heat indeed gets transfered to the outside air.

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  • [–] 3 points 4 months ago

    It makes more sense if you read the context. They're responding to a comment that said this:

    I guess you don't understand active cooling then. If the coolest air in front of you is ~160⁰F, well that's the coolest your batteries are gonna get, at best. Which is way hotter than rated temperatures for lithium batteries...

    A response that says "it's not X" can be interpreted as "it's not doing the thing you said it's doing". In this case, over_clox is saying that heat transfers directly from the battery to the air.

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  • [–] 4 points 4 months ago (1 child)

    The same way a fridge works

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  • [–] -1 points 4 months ago (3 children)

    So, where does that heat go?

    Last I checked, a fridge uses the outside air to cool the heat exchanger

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  • [–] 3 points 4 months ago

    Compressor heats up coolant, coolant exchanges heat with outside, cools down then evaporator cools it further, heat exchanges with cold loop then goes to be compressed again. It's the same principle that freezers and ac use, with the phase changes of the coolant you force them to move thermal energy in the desired direction.

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  • [+] -8 points 4 months ago (1 child)

    Yuh, you ever tried to run an air cooler system, of any sort, with 160⁰F / 71⁰C as the input air temperature? That's how you overstress underrated systems and shit fails anyways.

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  • [–] 8 points 4 months ago (1 child)

    Where are you pulling these numbers from? I'm relatively sure you're just making some up by now until you hit one where any concept that has been explained to you will not work.

    Contrarianism should not be entertained.

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  • [+] -7 points 4 months ago (1 child)

    Been there, experienced that, in my pocket no less.

    https://safelith.com/temperature-limits-for-safe-lithium-ion-battery-usage/

    Matter of fact, we got a phone battery on order to replace a spicy pillow. I should go check the mail now..

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