Exploring the Boiling Point of Refrigerants in Freezers and Refrigerators

In summary, the boiling point of a refrigerant is lower in a freezer compared to a refrigerator due to the lower temperature in a freezer. This allows for the refrigerant to boil at a useful working temperature, which is necessary for it to exploit the latent heat of vaporization. While intensity and quantity are important factors, the key factor in determining the boiling point is the usable working temperature, which is dependent on the thermal source.
  • #1
Bengo
46
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Why is the boiling point of a refrigerant in a freezer lower than that of a refrigerator. I would think that a freezer needs more heat removed so the the refrigerant needs a higher heat of vaporization thus a higher boiling point. Thank you
 
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  • #2
Bengo said:
Why is the boiling point of a refrigerant in a freezer lower than that of a refrigerator?

Refrigerator?Are you talking about the average boiling point of the refrigerator?
 
  • #3
In a section about a heat pump my book says the boiling point of the refrigerant used in a freezer is lower than the refrigerant used in an air conditioner or a refrigerator because the temperature in a freezer is lower. It seems like it would be the opposite to me.
 
  • #4
Bengo said:
In a section about a heat pump my book says the boiling point of the refrigerant used in a freezer is lower than the refrigerant used in an air conditioner or a refrigerator because the temperature in a freezer is lower. It seems like it would be the opposite to me.

You need the refrigerant to boil to exploit the latent heat of vaporization. You need to have this happen when the refrigerant is at a useful working temperature.

A useful working temperature will be one that is lower than that which you are trying to cool.
 
  • #5
Now you have me curious as to whether temperature of boiling point is the key factor at all. I don't see how intensity is the all-important factor, whereas quantity should be. Shouldn't it be calories or BTUs? Obviously there must be some window of usable temperatures but that will depend mostly upon what you have as a thermal source. Geez, now I need to whisk the cobwebs off my books as well as my memory.
 

1. What is the purpose of a refrigerator?

A refrigerator is used to keep food and beverages at a low temperature in order to slow down the growth of bacteria and prevent spoilage.

2. How does a refrigerator keep things cold?

A refrigerator works on the principle of thermodynamics, specifically the process of refrigeration. It uses a liquid refrigerant that evaporates at a low temperature, absorbing heat from the inside of the refrigerator and cooling the air. The refrigerant then condenses back into a liquid, releasing the heat it absorbed to the outside environment.

3. What is the ideal temperature for a refrigerator?

The ideal temperature for a refrigerator is between 35-38 degrees Fahrenheit (1.7-3.3 degrees Celsius). This temperature range is cold enough to slow down bacterial growth while also preventing food from freezing.

4. How does the placement of food items inside a refrigerator affect its efficiency?

The placement of food items inside a refrigerator can greatly affect its efficiency. It is important to leave enough space between items to allow for proper air circulation and to not overload the refrigerator, which can cause it to work harder and use more energy. Additionally, placing items in the coldest part of the refrigerator (usually the back) can help maintain a consistent temperature.

5. How can I make my refrigerator more energy-efficient?

There are a few ways to make your refrigerator more energy-efficient. Keeping it clean and well-maintained can help it run more efficiently. You can also check the door seals to make sure they are tight and not letting cold air escape. Additionally, minimizing the amount of time the door is open and avoiding placing hot or warm items inside can also help conserve energy.

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