How Fridge Defrost Works?

Defrosting in Refrigerators – How It Works?

You may be familiar with the frost that builds around the coils that cool the freezer if you have an old refrigerator or one of the small dorm refrigerators. If you wait long enough, the frost can grow up to 6 inches thick, and you won’t be able to put anything in the freezer. The majority of modern refrigerators include a built-in system that eliminates frost from the evaporator automatically. This feature, also known as auto-defrost or self-defrosting, is critical for keeping frost out of refrigerators and freezers. While most people are aware of the notion of auto-defrost, few are aware of how the system operates.

How Fridge Defrost Works?

Refrigerators and freezers work by providing a chilly atmosphere below the freezing point of water to keep food and beverages fresh. However, with time, a coating of ice will build around the evaporator coil, preventing cool air from entering the unit. Because the ice acts as an insulator, the refrigerator has to work twice as hard to keep chilly.

Defrosting melts the frost on the evaporator, which solves the problem of ice build-up. The frost will melt when the temperature around the frost-covered evaporated reaches over 32 degrees Fahrenheit. Some early freezers required manual defrosting, which was accomplished by turning off the electricity for a set length of time. Fortunately, most modern refrigerators and freezers offer this feature.

Auto-defrost refrigerators and freezers normally contain a temperature control mechanism that notifies the machine when it’s time to cease cooling. The machine is still powered up, but once the internal temperature hits the predetermined point, it will stop delivering cool air into the main compartment until the evaporator defrosts.

There are three fundamental aspects to a frost-free freezer:

  1. A timer
  2. A coil of heat
  3. A sensor for temperature

The heating coil is turned on by the timer every six hours or so. The heating coil is wrapped around the coils of the freezer. The ice on the coils is melted by the heater. When all of the ice has melted, the temperature sensor detects a rise in temperature above 32 degrees F (0 degrees C), and the heater is turned off.

It takes energy to heat the coils every six hours, and it also causes the food in the freezer to cycle through temperature changes. As a result, most large chest freezers require manual defrosting; the food lasts longer and the freezer consumes less energy.

The following are some of the advantages of auto-defrost in refrigerators:

  • Improved air circulation extends the shelf life of food and beverages kept in the refrigerator.
  • Foods are less likely to cling together while using this product.
  • Aids in maintaining the internal temperature of the refrigerator.
  • Prevents the formation of bad odors.

Of course, there are some drawbacks to auto-defrost as well. (Refrigerator Repair) Repairs and maintenance on auto-defrost refrigerators are more challenging due to the increasing complexity of their mechanical components. It’s also worth noting that just because the defrost timer resets to zero, the evaporator is still frost-free. Frost may stay on the evaporator coils even after the auto-defrost has set in if there is a lot of dampness in the air.