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[–] 260 points 6 months ago (38 children)

Resistive heaters still suck though because Heat pumps give you 200-400% efficiency. So heating wise, “100%” still less than maximally efficient.

(Not a violation of thermodynamics btw. Heat pumps use electricity to move heat energy that already exists, so the electric power in is often significantly smaller than the heat coming out of the device)

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  • [–] 398 points 6 months ago (28 children)
  • [–] 162 points 6 months ago (19 children)

    I'm so happy this man nerded out about heat pumps for a few hours.

    But now, all I see is inferior heaters.

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  • [–] 66 points 6 months ago (2 children)
  • [–] 10 points 6 months ago (1 child)

    Having been on long term sick leave for 15 years means you have to do something with your time and I spend a lot of it learning new things to various depths. I now understand why some (though not all) older people are angry: when you know a lot about a lot you see how bad many things are. There's so much inefficiency, shit design, shit quality, shit shit everywhere. It hard to not let it get to you.

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  • [–] 12 points 6 months ago (5 children)
  • [–] 21 points 6 months ago (7 children)

    Who is that? I love heat pumps too and would happily listen to someone talk about them for hours

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  • [–] 34 points 6 months ago (2 children)

    Search YouTube or revanced or whatever other free service for Technology connections, also the alt channel Technology Connextras.

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  • [–] 15 points 6 months ago

    His videos are why I got a heat pump water heater instead of a standard one when mine died. I figure in summer I can hook the exhaust duct up to my hvac and get a bit of free air conditioning out of it, since I don't have AC yet. Tiny extra bonus piped straight to my bedroom.

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  • [–] 13 points 6 months ago (2 children)

    Hey that's the guy I see once a year at Christmas time!

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  • [–] 66 points 6 months ago* (last edited 6 months ago) (2 children)

    Resistive heaters still suck though

    • Resistive heaters are much more portable and flexible. (edit: and quiet)
    • Resistive heaters are a viable backup when heat pumps fail in extremely cold weather.
    • Resistive heaters are less money upfront for if you only have to use them occasionally.

    One is not directly beneath the other. Both have their place.

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  • [–] 18 points 6 months ago (5 children)

    They're not 100% either, they make noises and emit light. That's loss

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  • [–] 3 points 6 months ago (2 children)
  • [–] 7 points 6 months ago* (1 child)

    No, but you can use some forms of "light" to heat things

    If you want confusing specifics, light has negative absolute temperature

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  • [–] 1 point 6 months ago* (last edited 6 months ago)

    Yeah, that is a bit confusing, i never thought about light being an example of one of those systems. Edit: looks like this applies only to laser light because light has a temperature of an emitting body, and lazing body has negative temperature

    my short interpretation would be like this

    A system with negative thermodynamic temperature is hotter than any system with a positive temperature. If a negative-temperature system and a positive-temperature system come in contact, heat will flow from the negative- to the positive-temperature system.

    This situation occurs because temperature is not really a measure of speed of particles, but rather a measure of entropy, and for ordinary objects entropy can increase infinitely, increasing temperature too. For systems with capped amount of states entropy reduces when energy is added, and that is negative thermodynamic temperature.

    So negative temperature is more energetic than positive, and because of that it heats up positive temperature object when in contact.

    Light kinda does that, but I am not sure I can come up with an explanation of how to measure its temperature and if it fits the definition

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  • [–] 79 points 6 months ago (16 children)

    Every electric device is a heater. Some just do other things too.

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  • [–] 58 points 6 months ago (14 children)

    A brushless motor only converts ~5% of its input to heat. That's low enough that you can reasonably call it a side effect.

    Now, a computer, that's a heater that happens to produce math as a side effect. 100% of its input ends up as heat.

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  • [–] 8 points 6 months ago (4 children)

    I love firing up my PC and gaming on cold winter nights. A well placed fan or two and I can spread it through my entire apartment and the heat won't kick on all night. Ends up saving me money, my heater costs way more than my PC to run.

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  • [–] 1 point 6 months ago (3 children)

    Sounds like your cold winter nights are not very cold.

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  • [–] 1 point 6 months ago (2 children)

    It goes down well below freezing here. My apartment is small.

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  • [–] 1 point 6 months ago (1 child)

    By "well below" do you mean -30? Or do you mean -5? Either way, you must have much better insulation than I do, because I have multi-kilowatt heaters and even on not-so-cold days my poor PC can't compete, no matter how hard I game.

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  • [–] 7 points 6 months ago* (last edited 6 months ago) (3 children)

    It all becomes heat eventually in the end though. Sometimes it's just a multi step complex process outside the physical bounds of the heater.

    Wait a sec, is the universe just God's space heater?

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  • [–] 1 point 6 months ago

    Yes, what is that motor doing? If it's a drill, it's spinning a drill bit and that drill bit generates a lot of friction when it tries to make a hole in something, and that friction generates heat. If it's spinning a tire, that tire generates a lot of friction with the road.

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  • [–] 51 points 6 months ago (7 children)

    I'm not well-versed on this topic, but doesn't the AC frequency cause alternating fields in the heating element, making it vibrate slightly? If that's correct, then you're losing an incredibly stupidly tiny amount of energy as sound too.

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  • [–] 17 points 6 months ago (5 children)

    And that satisfying glow is losses as light, which will do some heating, but not as efficiently

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

    There's a whole class of electric heater that do this intentionally. Radiant heaters are awesome for outdoor patios and other spaces like uninsulated garages where you care more about heating surfaces than the air itself.

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  • [–] 8 points 6 months ago

    I don’t know why but as much as I’ve read about radiant heaters to try understanding them your random comment I read here is what it took for things to finally click into place for me. I really love those ah ha moments. Just wanted to say thank you.

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  • [–] 6 points 6 months ago (2 children)

    Unless it is visible to the window at which point the light escapes and doesn’t heat your house 100% efficiently

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

    Most of the heating energy would actually be IR, which many types of window glass will be designed to reflect. It probably depends on what kind of coatings are used. Basically all car windows block IR to help keep the inside of the car cool in the sun.

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  • [–] 3 points 6 months ago

    It’s a silly thing, but if it glows orange, and if any of that orange light escapes or is visible from the window, it is not 100% efficient. But this is just pedantic in reality, even cheap heaters will do a good job of converting electricity into heat.

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  • [–] 38 points 6 months ago (5 children)

    Isn't some energy still dissipated as light instead of heat?

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  • [–] 30 points 6 months ago (3 children)

    Which travels to a location, hits it and is eventually converted to heat.

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  • [–] 1 point 6 months ago (2 children)

    So not a heater...but the universe.

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  • [–] 69 points 6 months ago (19 children)

    Also a question of optimizing its use

    vgy.me

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  • [–] 11 points 6 months ago* (8 children)

    A completely valid pannini press, imo.

    Like this is literally the 'modern problems require modern solutions' meme.

    I've used older PC battlestations of mine as 'bonus' spaceheaters more than once, lol, sorta like those 'pocket warmer' apps for phones that would just run some absurd computation that would redline the cpu, hahah!

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  • [–] 6 points 6 months ago (2 children)

    I have a little "tradition" of doing a playthrough of very hardware-demanding stuff in winter. Tarkov is one of my favs for this since it's unoptimized as hell and the post soviet aesthetics really fit the season

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  • [–] 3 points 6 months ago*

    I may get flack for this but mine was the Cinematic Mod version of HL2.

    Not because I wanted ... the terrible 'cinematic' music, or ludicrous XXX character model 'upgrades'... I genuienly liked the revamped maps, greater texture detail.

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  • [–] 5 points 6 months ago

    I had some frozen imitation crab legs that I wanted to eat, but didn't want to microwave proper. I put them on top of my PC's GPU radiator and ran a stress test while watching stuff so it would thaw faster without overheating.

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  • [–] 2 points 6 months ago (3 children)
  • [–] 2 points 6 months ago* (2 children)

    Oh.

    Sorry, I'm... actually unfamiliar with concept.

    Is that basically a sausage with a small loaf of bread baked around it?

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

    Sorry it's a sausage roll in English; it's called sausage bread in Dutch

    https://nl.wikipedia.org/wiki/Saucijzenbroodje

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  • [–] 1 point 6 months ago

    Ah ok! I don't speak Dutch, but it looks like a kind of ... flakier, pastry style bread... honestly looks delicious!

    Closest thing I've personally had to that would probably be a piroshki/pirogi, or maybe a calzone, but those both use more... bready breads, if that makes any sense, lol.

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  • [–] 4 points 6 months ago (3 children)

    GAH! Unless you personally disinfected them and wiped them clean of disinfectant, GAH! Know how many people play footsie with those?

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  • [–] 3 points 6 months ago* (2 children)

    ... Some people keep track of their power bricks and know where they've been.

    ... Never thought 'good cable management' would become a hygiene/sanitation issue, but, apparently it is.

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  • [–] 4 points 6 months ago (3 children)

    noo get the oily greasy food away from technology 😭

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  • [–] 33 points 6 months ago (5 children)

    Isn't there also visible, non heating light coming off them.?

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  • [–] 12 points 6 months ago (2 children)

    I think that light also becomes heat again once it strikes a surface

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  • [–] 16 points 6 months ago

    Mostly, but not entirely.

    Most thing you struggle to approach anywhere near 100% efficient, heating is a bit easier in that you can get a lot closer, but you’ll still hit limits before reaching 100%.

    Saying inefficiencies are lost as heat is really a lazy simplification, inefficiencies are lost as anything It just turns out that 95% of anything is heat, from entropies perspective.

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  • [–] 32 points 6 months ago

    Yep, every electric device is a toaster, some are just super inefficient at it.

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  • [–] 22 points 6 months ago

    The entropy machine has a 100% efficiency

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