Buzz
Key Points
- Frost-free refrigerators avoid ice buildup by utilizing a timer, a heating element, and a temperature sensor to periodically warm the coils, melting any ice that has accumulated.
- The heating coil, wrapped around the freezer coils, is triggered every six hours by the timer to remove the ice automatically without any manual work.
- Though this self-defrosting process uses some energy and may lead to slight temperature changes in the freezer, it eliminates the need for manual defrosting, offering a hassle-free solution for modern fridges.
If you own an older refrigerator or a small dorm-sized fridge, you’re likely familiar with the frost that forms around the cooling coils in the freezer. Over time, if left unchecked, the frost can build up to six inches, leaving little to no space in the freezer for your food.
Frost forms when water vapor comes in contact with the cold coils. The vapor condenses, turning into liquid water. It’s similar to the way condensation forms on a glass of iced tea on a hot day. This condensed water then freezes instantly when it touches the cold freezer coils.
A frost-free freezer consists of three main components:
- A timer
- A heating element
- A temperature sensor
Every six hours or so, the timer activates the heating coil, which is wrapped around the freezer coils. The heating element melts any accumulated ice. Once all the ice is gone, the temperature sensor detects the rise in temperature above 32°F (0°C) and switches off the heater.
Heating the coils every six hours requires energy, and it also causes temperature fluctuations in the freezer. As a result, most large chest freezers need to be manually defrosted instead, as this helps preserve the food longer and reduces energy consumption.
