Why do we use Cascade Refrigeration Systems?

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Cascade Refrigeration Systems are more efficient than traditional systems due to their use of multiple refrigerants that operate within optimal temperature ranges for phase changes. The efficiency comes from the ability to transfer heat more effectively during the phase change from gas to liquid, with each refrigerant designed to maximize this process. By using a combination of gases, such as propane and carbon dioxide, the system can maintain a more efficient temperature-pressure range, enhancing heat transfer. This design allows for better heat concentration and condensation, ultimately improving overall system performance. The discussion highlights the importance of selecting refrigerants that work well together to optimize efficiency in refrigeration systems.
Yousef Dajani
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I know that the Cascade Refrigeration Systems are more efficient than the normal Refrigeration Systems, but I still don't know why?
 
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My thought is that you have an effective bump in efficiency at phase change from gas to liquid and the farther you get from the bump the less efficient... So two bumps is better
 
Andy SV said:
My thought is that you have an effective bump in efficiency at phase change from gas to liquid and the farther you get from the bump the less efficient... So two bumps is better
I don't understand your opinion
 
Big sigh ... Yea I get that a lot
 
Ok so I will try to rephrase with more clarity.
Change from let's say liquid propane to a gas eats heat. But a change from gas to a thinner gas does to just not as much. Compression of that gas to a denser gas forces out the heat but not as much as compression of the propane to a liquid. So the temperature pressure range closer to where it changes phase is more efficient at moving heat. But that is not a wide range. So you get a different gas like carbon dioxide and cool it with the propane now it's a lot easier to concentrate condense into a liquid and you can stay in the temperature band that it is efficient in.
I hope that is better
 

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