AI hi guys, pretty great AI article about this AI Peltier AI cooling AI tech. Really looking AI forward for another AI Samsung new AI devices. Best regards, AI Ps.: AI
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Staying cool without refrigerants: Next-generation Peltier cooling
241–250 of 329 posts
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#242Earlier quoted context omitted.
My process control theory textbook has a chapter on neural networks and a lot of the language in control theory has an AI like tinge to it. I think this AI language is native to control theory so it might not be as overblown as it first sounds.
Huh, control theorists always try to rigorously prove the stability and performance of their algorithms. AI seems to be the opposite of that: just let the black box solve it and don't worry about any problems, we'll just add more training data if they happen!
Yes! Let's spend 100x the resources on AI to do what a PID controller or Kalman filter can do.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#243Mandatory Technology Connections video about Peltier cooling, "Why Thermoelectric Cooling Is Inefficient": https://www.youtube.com/watch?v=CnMRePtHMZY
Could you summarize the contents of this video so we don't have to watch it?
I haven't watched it recently, but here are the main takeaways I remember:
Peltier coolers are neat because they're very small and quiet - as opposed to vapor compression systems solutions. However, they are an order of magnitude less energy efficient.
Also Peltier coolers still have to obey the laws of thermodynamics, which means that to cool one side of the mechanism, you must heat the other side. In order to do any substantial cooling, you need a way to dispose of that heat on the other side. This usually involves the use of radiators and fans, which negate much of the size and noise benefits.
As a result, Peltier coolers are pretty niché. Your use case would have to require only a little bit of cooling. You'd have to need a form factor that cannot accomidate a vapor cooling solution. And you'd have to be willing to make the system very energy inefficient.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#244Re: Staying cool without refrigerants: Next-generation Peltier cooling
#245Earlier quoted context omitted.
What's a "low temperature difference"? I want to build a wine cooler in my basement ~20-24c, and I want it at ~16c. Is that low enough to be reasonably efficient?
TECs are wonderful little devices with operating characteristics unlike comparable devices. They can be designed to move a specific amount of heat or to cool at some delta-T below the hot side (and due to inefficiencies the hot side can climb above ambient temperatures too, raising the “cold side” above ambient!) I ran through a design exercise with a high quality TEC and at 8°C delta-T for a wine cooler you could ex…
This is great, thank you! Now I’ve got a new project to fiddle with :)
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#246Earlier quoted context omitted.
15 is absurd, regular peltiers get like 1.05 at most don't they? That's like inventing the warp drive but for cooling.
You can get a COP of ~3-4 out of regular TECs, but only at pretty low temperature differences. That's the killer, fundamentally the TEC material itself is thermally conductive and heat really wants to flow back the other way, so no matter how well it moves the heat, it winds up fighting against the heat load generated by itself. A refrigerant based heat pump works much better because the heat basically only moves in…
Physics dictates that the energy required to cool an object by 1C increases linearly, with difference to ambient temps.
It's like trying to swim against the current - the faster the river flows, the harder it is to move forward at the same rate.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#247This article uses the term AI 5 times to talk about basic microcontroller sensor readings.
I purchased a book the other day, and when I turn the pages, it automatically shows me the text that I want to read. It must be powered by AI.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#248Re: Staying cool without refrigerants: Next-generation Peltier cooling
#249Earlier quoted context omitted.
And they couldn’t use a 100% efficient resistive element because…?
typically only used if you need to stabilize the temp very close to room temperature or cool it below, unusual choice otherwise compared to a heater.
Even above ambient, being able to reverse direction allows limiting any overshoot.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#250Earlier quoted context omitted.
Had a similar experience myself. The thinness of Peltier devices bothers me. Amazing temperature differences… without any room to insulate such!
I don't know how people can convince themselves that they can understand these effects. Unusually effective heat insulation is exactly how they work. (This is tempered by eg radiative losses, so making them thicker doesn't work better.) placing poorer heat (vs electrical) insulators between peltier material is counterproductive, similar to using resistors to improve conduction between copper wires Don't ask me for a…
What is exergy? The one time a mechanical engineering colleagues tried to explain it to me, he reached the wrong conclusion on the problem we were working on.
I haven't seen it in any physics thermodynamics book, and only mech eng. seem to know what it is, and then only in the US.
Faires (undergrad MIT Thermo book from the 50s) makes no mention of it as far as I can tell.