I see it now. Yes, that could be true. The melting of the ice takes heat from it's surroundings, the remaining ice or the liquid. Latent heat is a tricky thing.
Thanks for your reply Chester and Steamking.
The reason behind my question is this: for a few years we have this project where students have to design and build a cooling machine, just using air and water as media and powered just by hand. This for cooling a small chamber for storing medicines...
Sorry, I mean a simple pressure cilinder, without a piston (actually, students use a Coca Cola bottle).
So say Yes, but then you say that the expansion must be free and not through a turbine. I've read this in the article, and I don't get it. Expanding through a turbine surely makes the air do...
Thanks for all the replies. So an expanding pressure cilinder does work by pushing the lower-pressure gas away and therefore decreases in temperature. The most temperature drop would occur inside the cilinder, I assume?
Does it make a difference if the expanding gas does more work, say in the...
Hi, thanks for your reply. Of course we know how a refrigerator works. In my situation, there is no phase change.
But your link to the Joules-Thomson effect is very helpful. Although I still don't understand why it's important for an expanding gass to do work or not. Is simply expanding of air...
Hi! I'm a teacher in Mechanical Engineering, and I organize a (yearly) student's project where they design and create a cooling machine. The machine works by compressing air, cooling the compressed air, and then rapidly expanding it. This can lead to temperatures of minus 7 degrees Celsius.
I...