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)
They’re not 100% either, they make noises and emit light. That’s loss
well considering everything over 0K emits light I guess there really is no 100% efficient electric machine
Isn’t light heat?
No, but you can use some forms of “light” to heat things
If you want confusing specifics, light has negative absolute temperature
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
Strictly speaking that’s not efficiency, but a coefficient of performance.
And funny enough the work energy doesn’t even have to be electricity. It’s actually mechanical energy, that is required and you could even power a heat pump with a steam or diesel engine.
God I spent too much time arguing with people who say that heat pumps are >100% efficient…
Every electric device is a heater. Some just do other things too.
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.
math as a side effect
That’s a funny way of spelling porn
Fun fact! Your porn machine can also be used to shitpost.
It might output the results of a computation once in a while though
if you dont count powering i/o devices (other heaters) (or electromagnetic wave emmiters so heaters with extra steps)
Main effect of a brushless motor is moving matter really fast, which, on a molecular level, is same as heating it.
Indeed we’ve plugged in a bitcoin miner to our central heating and now heating is “free”. I’m not sure how profitable it is when you’re not using the heat though.
Also a question of optimizing its use
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!
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
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.
That’s sausage-bread though
Oh.
Sorry, I’m… actually unfamiliar with concept.
Is that basically a sausage with a small loaf of bread baked around it?
Sorry it’s a sausage roll in English; it’s called sausage bread in Dutch
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.
GAH! Unless you personally disinfected them and wiped them clean of disinfectant, GAH! Know how many people play footsie with those?
… 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.
noo get the oily greasy food away from technology 😭
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.
Even sound energy eventually ends up as heat, though!
And that satisfying glow is losses as light, which will do some heating, but not as efficiently
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.
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.
Isn’t there also visible, non heating light coming off them.?
I think that light also becomes heat again once it strikes a surface
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.
Yep, every electric device is a toaster, some are just super inefficient at it.
Remember: Every device is a smoke machine if you use it wring enough.
Also: Every electrical device is filled with smoke and the job of electricians is to stop the smoke from escaping, which would render the device useless.
The correct technical term is magic smoke.
Today I learned
Hehe yes, we called it “magic smoke” in the early days of my engineering studies. Devices run on magic smoke so they stop working if the magic escapes.
Isn’t some energy still dissipated as light instead of heat?
Which travels to a location, hits it and is eventually converted to heat.
Noise would be a small but non-zero form of heat loss that shouldn’t contribute to temperature increase
Noise would turn in to heat as it’s absorbed, so it’s just heat with extra steps. Same deal with lights
The entropy machine has a 100% efficiency
Does it make any sound?
A heat pump will drop to 100% efficiency in cold enough weather.
Can heat pumps drop below 100%?
They can drop all the way to 0 if the temperature difference is high enough. You can’t heat your house with a heat pump if it’s 0K outside.
Is a heating element actually 100% efficient, though?
Some of the energy is converted to light.
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Heat pumps move heat from outside to inside, and they use less energy than the amount that is brought into the insulated area, resulting in efficiency numbers over 100%. (less energy used than the amount brought inside was used to bring the inside energy levels up)
induction losses:
Perhaps this is a dumb question, but perhaps it is not:
If you just had, in say a studio apartment, or a single bedroom, basically just a large container of water, where the container is made of something fairly to considerably thermally conductive…
Would or could this act as something like a thermal regulator for the room, to a potentially useful degree, such that it could ease the overall power usage of an AC/Heating system?
The water doesn’t do anything, in like a designed machine sense; its not part of plumbing or heating, its just a big ole tank of water, sitting there.
The idea I am going with is something like how large static bodies of water act as regulators for nearby climate zones, through a day night cycle … they tend to keep temperatures in the surrounding area a bit more stable, though of course humidity and the water cycle have other effects in a more open weather system.
I also realize there are a lot of potentially confusing or confounding variables at play here.
But my thinking is that maybe, at some scale, in some conditions, this could basically normalize your day-night temperature cycle, at least somewhat.
Obviously in real world, just a simple tank of water would potentially freeze in winter, or boil in summer, in more extreme environments, that you’d at bare minimum have to have some mechanical system to prevent problems… but uh, … yeah.
You see this with normal heating systems. My house has hot air heating with a big burner and vents in the rooms. It is great for instant heat but once it turns off you lose the heat just as fast. And if you dont have a vent in the room it can be pretty cold.
But the house I grew up in had water filled radiators in every room. Took ages to warm up the house but it would transfer an awful lot of heat into the brick walls so it would stay warm for a really long time after the heating shut off.
So in the old house in winter you really didnt notice the heating turning on and off but in my new one it is painfully obvious. I really want to rip it out and get a better system.
Yes, this is called thermal mass, or more scientificly, heat retention. The more stuff you in have a space, the more resilient to change it’ll temperature it is. Insulation, is basically putting a bunch of high retention materials in perimeter of a building so that it stays more consistent
Hrm.
What about:
Radiant Barrier.
Basically, as I understand it, this stuff is extremely good at reflecting heat… not… absorbing and containing it. And it is relatively stupidly cheap, for how effective it is.
Like, its so effective that the industry that makes traditional US home insulation batting… basically did everything they could to make it so as few people know this stuff exists as possible.
Radiant barrier is a different insulation mechanism and is also good. The nice thing about radiant barrier is it requires very little material to do its thing. The best solution is a combination of the 2, but most insulation is still opperating by thermal mass.
That is in line with my understanding as well.
Useful? No, mainly because you need circulation of the air to feel it.
I didn’t downvote you, but:
Ok, then… have a ceiling fan above it?
A very slow one, that uses little energy?
Secondary thought! What if you attached a bunch of processor heat sink type fins to the mass? Might not be good for long term regulation, but it would smooth out temperature curves daily.
Yes but then the downside is you have a giant porcupine that will draw blood, in the middle of the room, lol.
You could buff that out a bit though?
…?
Badges of honor are not so easily dismissed.
Yes but there might be nonmasochists in the household, guests, children, pets, etc.
Not everyone is defacto down with a blood sacrifice for the Omnissiah.
Very fair. I forget my selfishness on occasion. Thank you for reminding me that I am not the center of the universe.
No need to apologize for someone else. But I appreciate the thought.
And you are absolutely right. A ceiling fan, plus a thermal mass would work.
Those give off light. Still not efficient
Only if that light escapes through a window. Otherwise, it is heat.
Or chemical reactions.
