In daily life, refrigerators have become indispensable household appliances, and their refrigeration technology has undergone multiple changes, moving from traditional direct cooling to the current variable frequency era, which profoundly affects our life experience.

Early direct cooling refrigerators had evaporators that directly contacted the interior of the compartment or air to absorb heat. It has unique advantages, with a relatively high humidity in the refrigeration room, which can keep fruits and vegetables moist and fresh for a long time; Each room is independent of each other, effectively avoiding food contamination. Moreover, its structure is relatively simple, the cost is low, and the price is affordable, making it the first choice for many families. However, the disadvantages of direct cooling technology are also obvious. The freezer is prone to frosting and requires regular manual defrosting, which is cumbersome and time-consuming; As the volume of the refrigerator increases, the refrigeration efficiency decreases, the temperature distribution is uneven, and there are large fluctuations, making it difficult to accurately maintain the optimal storage temperature for food, which affects the preservation effect.

To address the shortcomings of direct cooling technology, air cooling technology has emerged. Air cooled refrigerators use fans to transport air to the evaporator chamber hidden on the back panel, absorb heat, and then send it back to the compartment, achieving automatic defrosting without the need for manual cleaning by users, greatly saving time and energy. At the same time, it has a fast cooling speed and uniform temperature distribution, which can quickly reach the suitable storage temperature for food and achieve better preservation effect. However, ordinary air-cooled refrigerators also have shortcomings. While the fan accelerates the air flow, it is easy to take away the moisture in the food, causing the ingredients to dry out and the taste to deteriorate. Moreover, there is obvious wind noise during operation, which to some extent affects the quietness of the home environment.

The integration of frequency conversion technology has enabled a qualitative leap in refrigerator refrigeration technology. The compressor speed of traditional fixed frequency refrigerators is fixed, and it stops when the set temperature is reached. When the temperature rises, it restarts. Frequent start stop not only increases energy consumption, but also leads to large temperature fluctuations, which is not conducive to food preservation. The variable frequency refrigerator can automatically adjust the compressor speed according to the temperature changes inside the refrigerator. When the refrigerator is just turned on or when a large amount of food is put in, the compressor runs at high speed to quickly cool down; When the temperature approaches the set value, the compressor slows down to maintain a low temperature environment, reducing energy consumption and temperature fluctuations. In this way, the variable frequency refrigerator operates more efficiently, with lower noise, more precise temperature control, and greatly extends the food preservation period.

From direct cooling to air cooling, and then to the integration of variable frequency technology, the iteration of refrigerator refrigeration technology has brought us many conveniences. We no longer need to worry about regular defrosting, as our food has better preservation and longer storage time, allowing us to enjoy fresh ingredients anytime. At the same time, refrigerators reduce energy consumption and noise, creating a more comfortable and energy-efficient living environment for households. With the continuous advancement of technology, we believe that the refrigeration technology of refrigerators will continue to innovate in the future, bringing more surprises and convenience to our lives.