Posted on 06/05/2022 6:18:00 PM PDT by SunkenCiv
The first form of artificial refrigeration was invented by William Cullen, a Scottish scientist. Cullen showed how the rapid heating of liquid to a gas can result in cooling. This is the principle behind refrigeration that still remains today. Cullen never turned his theory into practice, but many were inspired to try to realize his idea.
(Excerpt) Read more at materials.sandvik ...
Now post about the Einstein refrigerator (no joke) which uses no electricity.
I think Electrolux holds the patent.
Bet that fruit truck guy was an American citizen.
One phenomenon that's sprung up recently (from what I've seen) in the east SF Bay Area has been the popup fruit stand, with its wholesale-format flats of fresh fruit (generally just one or two kinds, right now it's strawberries and cherries), a big patio umbrella, and a couple of small adults who look to be natives from Central America. They are almost certainly not here legally. I've seen them encamped not far from a nearby college campus (to tug on the heartstrings of those liberal kids) or a public transit parking lot (and a recently-cleared homeless encampment).
It's a sign of the degradation of our culture that these people (again, almost certainly not here legally) hang out with their wares and no one stops them and people (with the best of kind intentions mind you) even keep them in business. They are brethren to the little men I see nearby who arrive every morning with their caps and hooded sweatshirts and backpacks, out looking for day labor opportunities.
Thank you. Made me smile and tap my toe
The guy sharpening knives - would he do it right there on the spot? (I’m guessing he did if he had the stone with him).
That might even work today still. We have a set of nice knives that they will sharpen for free. Except you have to ship them back, wait weeks, etc. The local store will also sharpen them - two at a time. We’ve never done either!
I’ll sharpen one of them - but my wife doesn’t trust me with the others!
Cool you mention it... I have been experimenting with the Seebeck/Piezo effects recently. Aluminum and Iron is the most efficient combination. I am building an underground walk in refrigerator cooled with solar on large metal plates also taking advantage of the power output. No moving parts. :)
““how the rapid heating of liquid to a gas can result in cooling.”
Holy cow! That’s not at all how refrigeration works.”
Lol, nope... It sure isn’t.
My mistake, too early and not enough coffee... Seebeck/Peltier. :)
“unless you ever had access to a propane-powered fridge”
Good point. I didn’t think of that.
It’s not ‘rapid heating of a liquid’, it’s rapid EXPANSION of a gas under pressure. That’s called adiabatic expansion.
Although it is. Anhydrous ammonia is widely used as refrigerant in industrial facilities such as:
Just checked, episodes are on YouTube.
The Secret Life of Machines. Here is the "refrigerator" episode ...
“The Scots saved the world”
Wilis Carrier saved Florida.
5.56mm
Upton Sinclair. First part was a good story. Last part was a slog to get through. They were cutting ice blocks to sell in the cities from the settlement ponds outside the factories. Gross.
Some of the best ideas come from people who say, he, let's drink about it.
Thanks!
Cool!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.