refrigerators can be divided into three types: air cooling, direct cooling and mixed cooling. What are the differences in principle between the three types of refrigerators? What's the difference in using it? If I hadn’t used them all, I might not be able to tell clearly. Coincidentally, I have used them all - from now on, I no longer believe in the salesperson's "tongue of brilliant lotus flowers".
Direct cooling refrigerator The most original
The refrigerators of the last century were all direct cooling refrigerators. It is still active on the market today, which shows how useful it is.
Principle: When the compressor is running, the temperature on the evaporator decreases. Place the evaporator directly in the refrigerator, or install it close to the inner wall of the refrigerator, so that the evaporator can directly absorb the heat inside the refrigerator to achieve the purpose of cooling. Advantages of
:
1. The highest efficiency, more power saving, and fast cooling speed.
2. The structure is simple, so it has a long life and low maintenance costs.
Disadvantages:
1. The temperature of the evaporator is too low, so frost will occur near the evaporator. Especially the freezer needs to be defrosted manually every once in a while.
2. The temperature inside the refrigerator is uneven. The closer to the evaporator, the lower the temperature, which may even freeze the food. The temperature far away from the evaporator is too high, and the food cannot freeze for a long time after being put in it.
purchasing advice: Users with a low budget must not miss it. For refrigerators under 1,500 yuan, try to choose direct cooling - if you choose the other two refrigerators at this price, you may have problems such as poor quality.
Air-cooled refrigerator The most cost-effective
Direct-cooling refrigerators are rarely available abroad. Almost most of the mid-to-high-end domestic markets are air-cooled refrigerators.
Principle: hides the evaporator, and uses a fan to blow the low-temperature air near the evaporator into the refrigerator during cooling.
Advantages:
1. There is no frost in the refrigerator and no manual defrosting is required. Frost will form near the evaporator, but because the evaporator is hidden, we can't see it. When the refrigerator is shut down, the ice on the evaporator will melt automatically.
2. The temperature control is more precise. When the fan is turned on, it will cool down, and when the fan stops, it will no longer cool down. Even if a direct-cooling refrigerator stops cooling, the low temperature remaining on the evaporator will still cause the internal temperature of the refrigerator to continue to drop. Therefore, the temperature adjustment of direct-cooling refrigerators is all gears, while the temperature of air-cooling refrigerators can be set directly.
Disadvantages:
1. It is easy to carry odors. The odor that originally existed in the corner (such as a bottle of stinky tofu placed in the corner) will be blown by the wind and make the entire refrigerator smelly.
2. It is easy to air-dry food because wind will accelerate the evaporation of water on the surface of the food, making the food dry.
purchasing advice: is moderately priced and has the highest cost performance. The product coverage is relatively complete, and you can buy air-cooled refrigerators in high, medium and low-end refrigerators. The only thing you need to pay attention to is that the food must be sealed during use.
Mixed cooling refrigerator has the best preservation effect.
The latest heat exchange technology in refrigerators now is mixed cooling. As the name suggests, refrigeration and air cooling are mixed together.
Principle: Two sets of evaporators are installed in a refrigerator at the same time. The cold room uses direct cooling and the freezer uses air cooling.
Advantages:
1. There is no frost in the freezer, no odor in the refrigerator, and it has the advantages of air cooling and direct cooling.
2. The freshness preservation effect is the best. The refrigerator and freezer are independent of each other and can be locally refrigerated according to the needs of their own areas.
Disadvantages:
1. Two sets of evaporators lead to high costs, so the price of a mixed-cooling refrigerator is often more than 5,000 yuan. Failure rates are also higher, and repair costs can skyrocket when something breaks.
2. The problems of water accumulation in the refrigerator compartment and odor transfer in the freezer have not been solved. Fortunately, the probability of these two problems occurring is relatively low.
Buying suggestions: If your budget for purchasing a refrigerator is more than 10,000 yuan, then you must not miss the mixed-cooling refrigerator. In addition, if you have high-end food preservation needs (such as needing to preserve breast milk in the refrigerator), it is also recommended to choose a mixed-cooling refrigerator. The variable temperature chamber of a mixed-cooling refrigerator has the best temperature control.
[Some of the pictures in this article are from the Internet]
