Here is an article from Johns Hopkins with a little more information on the newly created material. https://www.jhuapl.edu/news/news-releases/250521-apl-thermoe...
Staying cool without refrigerants: Next-generation Peltier cooling
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Re: Staying cool without refrigerants: Next-generation Peltier cooling
#252This 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.
It looks like joke today, but it's not a joke anymore.
Book can look at your search history youtube history, or reading history to have insight about your points of interest to create list of topics you like, then generate pages on the fly using LLM.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#253Earlier quoted context omitted.
> Normal fridges just let the temperature have a wider swing which is good enough for most needs. These wide swings annoy me. You hear that you shouldn't let your fridge go above 4°C, because that's dangerous. And you obviously don't want your fridge to go below 0°C. But finding a setting where the hottest part of the fridge doesn't go above 4°C (or even 5°C or 6°C) during the hottest part of the cycle and the coldes…
Put a thermometer in a plastic bag (to keep it dry) in a jar of water in your fridge, you'll likely find the temperature of items inside the fridge much more stable than the air temperature.
The yogurts at the back of my fridge still freeze up.
There's going to be a temperature gradient in a typical fridge, if only because one side is getting opened every now and then, and the other is separated by all the products which are inside.
I suppose what they're trying to do here is even out that gradient without running the compressor.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#254For those worried about tiny COPs from these gizmos, trawling through the actual paper -- as well as the PR from JHU APL -- in this HN post [1] shows claims of COPs of ~15 for Delta Ts of 1.3°C. A compressor based cooler gets a COP of about 4 in the real world. I'm pretty sure this is an apples to oranges comparison to an expert (I am not one of those) but a factor of 3+ increase in COP is fairly noteworthy -- if it…
COP of peltier elements can be large only when the temperature difference is small, such as the measly 1.3 degrees you quoted. When do you want to cool something by only 1.3°C compared to the surrounding temperature?
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#255Mandatory 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?
Heat pumps have a COP of 3-4, add in an evaporative cooling tower for a COP of 7. Peltier coolers will always have a COP of less than 1 (.1-.5?)
Unless you want to spend more energy that you remove in heat, stick with heat pumps and cooling towers.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#256Earlier quoted context omitted.
A thermostat is a cybernetic device.
So we need both AI and Kubernetes.
Hating on Kubernetes in 2025 doesn't really dong the gong like it used to, if you want to control your workloads through a well integrated API and not be bound to a cloud vendor there aren't many realistic options.
Kubernetes is only hard because people make it hard and never bothered to understand the basics of their workload scheduler.
Kubernetes is NOT AI hype, it solves real problems for real people everywhere.
"Infrastructure projects" that are here to stay and only getting better: Linux, systemd, Postgres, Kubernetes etc...
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#257Mandatory Technology Connections video about Peltier cooling, "Why Thermoelectric Cooling Is Inefficient": https://www.youtube.com/watch?v=CnMRePtHMZY
This video assumes that this technology will remain static over time.
Peltier cooling could have a higher utility local maximum than currently used refrigerants.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#258[deleted]
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#259Earlier quoted context omitted.
Is there anything that is proved to be "immunity boosting" apart from vaccines? Well, and germs of course. Germs will cause an immune response, but that's probably not the kind of "boost" you are interested in. As for AI, I guess it is sufficiently vague and also not a medical claim, so you can put it everywhere. But because it is just as vague for consumers, is it even worth something for marketing?
Depends on your definition of "boosting". Vitamin C is essential for plenty of immune functions and a deficiency has serious effects on immunity. Enormous doses of Vitamin C have been shown to be effective in various scenarios as well. https://pmc.ncbi.nlm.nih.gov/articles/PMC8239596/
While not wrong, that is very misleading - for the vast majority we already get plenty of vitamin C in our diet and we don't have the specific situations where enormous doses will be effective.
At least vitamin C is water soluble: your body will almost always just pee out any extra quick so it is very hard to overdose. Those who have a kidney problem should check with a doctor, for the rest of us massive doses just make our pee more expensive.
Re: Staying cool without refrigerants: Next-generation Peltier cooling
#260Mandatory Technology Connections video about Peltier cooling, "Why Thermoelectric Cooling Is Inefficient": https://www.youtube.com/watch?v=CnMRePtHMZY
This video assumes that this technology will remain static over time. Peltier cooling could have a higher utility local maximum than currently used refrigerants.
Maybe. However there is fundamental physics in play and so it is likely someone (not me!) can tell you the most efficiency we get from that system. I'd be curious what those people say.