Why do we use Cascade Refrigeration Systems?

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SUMMARY

Cascade Refrigeration Systems are significantly more efficient than traditional refrigeration systems due to their use of multiple refrigerants that operate within optimal temperature and pressure ranges. The system utilizes a two-stage process where a primary refrigerant, such as propane, is used to cool a secondary refrigerant, like carbon dioxide. This method enhances heat transfer efficiency during phase changes, allowing for better heat concentration and condensation. The strategic selection of refrigerants enables the system to maintain efficiency across varying temperature bands.

PREREQUISITES
  • Understanding of phase change thermodynamics
  • Familiarity with refrigeration cycle principles
  • Knowledge of refrigerants such as propane and carbon dioxide
  • Basic concepts of heat transfer and efficiency metrics
NEXT STEPS
  • Research the thermodynamic properties of propane and carbon dioxide as refrigerants
  • Explore the design and operation of multi-stage refrigeration systems
  • Learn about the efficiency metrics used in refrigeration systems
  • Investigate advancements in refrigerant technology and environmental impacts
USEFUL FOR

Engineers, HVAC professionals, and anyone involved in the design or optimization of refrigeration systems will benefit from this discussion.

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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