Hello everyone, I am your little assistant Brother Jie Xiu, today we are going to unveil the mystery of the frost-free refrigerator and talk about how it realizes the "freedom from frost troubles" in life. Frost-free refrigerator, the black technology of the modern home appliance industry, seems to be ordinary but hidden mystery, its operating principle is actually quite ingenious, just like a magician in the refrigerator industry, quietly helping you solve the headache of manual defrosting.
First of all, let's start with the principle of refrigeration. The core of frost-free refrigerators, also known as air-cooled refrigerators, is the use of a forced air circulation system. Just like an air conditioner, it has a small built-in fan that constantly blows hot air from the inside to the finned tube evaporators hidden in the mezzanine or upper back. The surface temperature of these evaporators is extremely low, and when the hot air passes through, a rapid heat exchange occurs, just as the hot air becomes instantly cooler when it comes into close contact with cold water, and the hot air quickly cools down and becomes cold air.
This air is then evenly distributed throughout the refrigerator, creating a continuous circulation of cold air that keeps the inside of the refrigerator at a constant and uniform temperature, which is why you won't see the frost build-up that is common in direct-cooling refrigerators.
However, frost-free refrigerators are not really completely frost-free. In fact, water vapor can condense into frost at low temperatures, despite the fact that the air cooling mechanism prevents the frost from adhering directly to the inner wall during long periods of operation. That's where the secret of a frost-free refrigerator comes in handy, the timed defrosting system.
The system consists of a defrost timer, a defrost thermostat and a heating wire. When the refrigerator has been working for a while, the defrost timer will automatically cut off the compressor and fan, and start the heating device, so that the frost on the evaporator will melt into water droplets and flow into the water trough. If the defrosting process needs to be controlled, there is also a defrosting thermostat to monitor the temperature and ensure safety and reliability. Once a set critical temperature or time is reached, the heating stops, and the refrigeration process resumes and the entire cycle starts again.
To sum up, the reason why frost-free refrigerators can keep us away from the days of manual defrosting is due to its unique air-cooled circulation technology and intelligent timed defrosting system. The next time you open the frost-free refrigerator and enjoy the refreshment, don't forget that there is this set of sophisticated operating mechanisms behind you silently!