Carnot refrigerator and II law of Thermodynamics

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SUMMARY

The discussion centers on the Carnot refrigerator and its relationship with the Second Law of Thermodynamics. The Second Law states that heat cannot spontaneously flow from a cold reservoir to a hot reservoir; however, the Carnot refrigerator operates by using work input to transfer heat from a cold reservoir to a hot one. This process does not violate the Second Law, as the work input facilitates the heat transfer, maintaining the thermodynamic principles. Understanding this mechanism clarifies the apparent paradox presented by the Carnot refrigerator.

PREREQUISITES
  • Understanding of the Second Law of Thermodynamics
  • Basic knowledge of thermodynamic cycles
  • Familiarity with the concept of heat transfer
  • Knowledge of work input in thermodynamic systems
NEXT STEPS
  • Study the principles of Carnot cycles in thermodynamics
  • Explore the concept of heat engines and refrigerators
  • Learn about the efficiency of Carnot refrigerators
  • Investigate real-world applications of thermodynamic principles
USEFUL FOR

Students of physics, engineers in thermal systems, and anyone interested in understanding thermodynamic processes and their applications in refrigeration technology.

sodaboy7
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As per II law of thermodynamics you it is NOT possible that a hotter body becomes hotter and colder body becomes colder when in contact. But in a Carnot refrigerator, the heat is taken from a cold reservoir and pushed to a hotter one. It sort of opposite the II law. Help me over this paradoxical situation.
 
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There is an input of work in the carnot refrigerator.

The second law of thermodynamics states that heat does not flow from a cold reservoir to a hot reservoir spontaneously. However, heat may flow from a cold reservoir to a hot reservoir with the input of work.
 
From the outside it might look like heat moves against a thermal gradient, but if you look at the processes, you'll see it never does.
 

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