samskiter
samskiter OP t1_j1cq3ts wrote
Reply to comment by RelativisticTowel in Why do we use phase change refrigerants? by samskiter
Great knowledge
samskiter OP t1_j1cpwcg wrote
Reply to comment by series_hybrid in Why do we use phase change refrigerants? by samskiter
Hmm yea that makes sense. What about a supercritical fluid?
samskiter OP t1_j1co3h0 wrote
Reply to comment by quintus_horatius in Why do we use phase change refrigerants? by samskiter
There are residential heat pumps with SCOP (seasonal cop) of 5.
samskiter OP t1_j1cnzgp wrote
Reply to comment by seven_tech in Why do we use phase change refrigerants? by samskiter
It's more like saying why we use 4 Vs 2 stroke.
samskiter OP t1_j193400 wrote
Reply to comment by seven_tech in Why do we use phase change refrigerants? by samskiter
Yea that seems to be the conclusion, but was wondering about the why. Like why we don't try and get as close to the carnot cycle as possible. The replies with numbers helped a lot with getting a sense / intuition for the scales and sizes that make the liquid so much better
samskiter OP t1_j18pvem wrote
Reply to comment by a_cute_epic_axis in Why do we use phase change refrigerants? by samskiter
Would that bit be more of a great engine than a heat pump as you are not working against a heat gradient?
samskiter OP t1_j18od2r wrote
Reply to comment by BigWiggly1 in Why do we use phase change refrigerants? by samskiter
Excellent answer, thanks so much. I'm certainly curious in what the gas-obly system would cost/look like if we made it and whether it could outperform phase-chabgw systems. (If we spent those 100s of thousands as you said!)
samskiter OP t1_j18nw7y wrote
Reply to comment by Jamie1897 in Why do we use phase change refrigerants? by samskiter
Awesome, bonus points for the Vidya. Will certainly watch later!
samskiter OP t1_j18nnn7 wrote
Reply to comment by incredibolox in Why do we use phase change refrigerants? by samskiter
So this is maybe a little bit of the crux of my question. A Carnot cycle is isentropic and I believe that phase changing would introduce randomness and therefore reduce theoretical efficiency limits.
samskiter OP t1_j18efbn wrote
Reply to comment by martinborgen in Why do we use phase change refrigerants? by samskiter
Interesting. The carnot cycle would extract energy during the expansion. Is there a way to do that with the evaporator? Why don't we do it?
Submitted by samskiter t3_zsiyxn in askscience
samskiter OP t1_j1cq9k9 wrote
Reply to comment by kilotesla in Why do we use phase change refrigerants? by samskiter
Nice! So your system could dynamically flex the boiling point to match the desired working range (within reason)?