"The only problem with Microsoft is they just have no taste. They have absolutely no taste. And I don't mean that in a small way, I mean that in a big way, in the sense that they don't think of original ideas, and they don't bring much culture into their products." -Steve Jobs
At the risk of going off on a tangent about that maxim; I feel like it's just misusing the word "purpose".
Maybe it would be cleaner to state that a system has no purpose (at least not until it is sentient), instead it has behaviors. Then one can observe that the purpose of the designers or maintainers of a system simply happens to be at odds (or as AI safety researchers would say, are "out of alignment with") the behavior of the system.
That all of course presupposes that one can accurately deduce the purposes of the designers/maintainers.. In the case of TikTok, I'd bet that we are all in agreement that their purpose is nothing more nor less than maximal value-extraction from people wishing to express themselves with videos multiplied against an audience of people who wish to view videos multiplied again against advertisers who want to insert propaganda into eyeballs.
This was enough for Carnegie, and the fact that they're not pursuing similar public works simply illustrates that while they may want to be loved, they don't care if they're loved or not.
Because they don't want to be beloved, they want to turn people into dinosaurs. (to adapt the Spiderman quote)
I can't find the episode after a quick search... I wish there were an archive of their past episodes, but I imagine someone would have to pay extra to the performers for that right.
"Pol Pot killed one point seven million Cambodians, died under house arrest, well done there. Stalin killed many millions, died in his bed, aged seventy-two, well done indeed. And the reason we let them get away with it is they killed their own people. And we're sort of fine with that. Hitler killed people next door. Oh, stupid man. After a couple of years we won't stand for that, will we?"
-Eddie Izzard
Resistive heating is a tremendously inefficient way to generate heat. Sometimes it's worth it if you get something useful in exchange (such as full spectrum light in the winter). But it's not all upsides.
Heat pumps are magic. They're something like 300% efficient. Each watt generates 3 watts of useful heat.
I share your enthusiasm about heat pumps, but I wonder what the efficiency of using waste heat is. Couldn't it be competitive with heat pumps? As it's a waste product, isn't it reasonable to also expect it to be more than 100% efficient?
As a rule of thumb (obviously it varies) you spend about 1% pumping water round a heat network. So your CoP is around 99 if you consider heat truly free. It's actually higher as pump energy largely is converted to friction/heat.
You can’t extract energy from heat by itself. Only from a heat delta.
Think of heat like flowing water or charge. Only an altitude or voltage delta creates the flow needed to harvest energy.
You get no useful energy from heat you are already trying to shed because you have no delta to work with. (The entire problem exists because there is no surrounding environment with high heat capacity and lower heat.)
Yes, because there is a heat delta. A heat difference.
Using higher heat to raise lower heat is just the most simple case.
But purpose isn't relevant to this constraint, it is a physics constraint. Regardless of purpose, you can't extract useful energy from heat without a heat difference to work with. (And without a heat difference, even "heating" with heat doesn't do anything.)
Yes you can, that is exactly what heat pumps do. As long as the total entropy increases it is not in violation of the laws of thermodynamics.
But I don't really see how that is relevant to the question of using waste energy to heat homes. We don't have ideal Carnot machines so there's always energy wasted, which most of the time is still good enough for residential heating.
The conversation was about harnessing energy, from heat, in orbit.
Heat pumps take energy to move energy. But you can't power the heat pump from the heat it is already pushing against the heat gradient.
Waste heat can be used, if there is a difference in heat to work across, but not if there isn't. A datacenter in Antarctica could recover energy from waste heat, against the freezing outdoor temperatures.
In orbital systems, the problem is getting rid of heat, so there isn't some cold place to use to create a heat gradient and harvest energy. Space is cold, but particles are so diffuse they have little heat energy capacity, so essentially a heat insulator, and not useful to create a gradient. Thus the use of radiators.
I suppose that efficiency whammy is worth it if you can use it to smooth out the duck curve. If power rates go negative then you'd be a fool not to run a space heater pointing at a rock!
I'm skeptical that it's easier. On the numbers alone, artisanal and small scale gold mining (apparently) accounts for 15-20% of global gold production. But coal accounts for 35% of total electricity generation.
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