How is the freezer part of a refrigerator is more cooler than the other parts?

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SUMMARY

The freezer compartment of a refrigerator operates at a lower temperature than the fridge due to the refrigeration cycle, which involves the compression and expansion of a refrigerant. The refrigerant is compressed, cooled, and then throttled through an expansion valve, resulting in a significant temperature drop. In combined fridge-freezer systems, two throttles are utilized—one for the fridge and another for the freezer—allowing for distinct temperature control. This design ensures that the freezer maintains a colder environment necessary for preserving frozen foods.

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  • Familiarity with refrigerants and their properties
  • Knowledge of thermodynamics related to gas expansion and compression
  • Basic principles of heat transfer in appliances
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pras_quantum
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please explain me..
 
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Both freezers and fridges work on a 'refrigeration cycle' http://en.wikipedia.org/wiki/Refrigeration_cycle.

A working fluid (refrigirant) vapour is compressed so it heats up, it then passes through an condenser to cool it down to a liquid. This is then throttled, it's pressure is lowered, which drops the temperature. It's then passed through the fridge to cool the air inside.

The key to why a freezer is colder than a refrigirator is that the working fluid is throttled through an expansion valve to a lower temperature.

http://www.howstuffworks.com/refrigerator4.htm
A summary. The fuild inside the fridge freezer plumbing cools when expanded. In the freezer it is expanded more to allow it to drop to a lower temperature.

In combined fridge freezers that run off 1 system. Two throttles are used, one that goes to the fridge and the other goes to the freeezer.
 

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