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

[pras_quantum]

please explain me..

 

[xxChrisxx]

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.

 

[sir-pinski]

The freezer part of a refrigerator is typically more cooler than the other parts because it is designed to maintain a lower temperature. This is achieved through a combination of insulation, air circulation, and the use of a refrigerant.

Firstly, the freezer is usually located at the top or bottom of the refrigerator, which allows it to be better insulated from the warmer air in the room. This insulation helps to keep the cold air inside the freezer and prevents warm air from entering.

Secondly, the freezer has a separate evaporator and fan that circulate cold air throughout the compartment. This allows for a more efficient cooling process and helps to maintain a consistent temperature.

Lastly, the refrigerant used in the freezer is typically a stronger and more efficient coolant than the one used in the rest of the refrigerator. This allows the freezer to reach and maintain a lower temperature, typically around 0°F, while the rest of the fridge is kept at a slightly higher temperature, usually between 35-40°F.

Overall, the combination of insulation, air circulation, and refrigerant in the freezer makes it the coldest part of the refrigerator. This is important for preserving frozen foods and keeping them at a safe temperature to prevent bacteria growth.