Comparison between direct cooled refrigerators and air cooled refrigerators:
1. Direct-cooled refrigerators will produce frost and ice, but there is no frost inside air-cooled refrigerators. Therefore, air-cooled refrigerators do not require manual defrosting, while direct-cooled refrigerators require defrosting.
2. Direct-cooled refrigerators cool by heat exchange, so the cooling speed is fast and the food enters the fresh state more quickly; Air-cooled refrigerators cool by blowing cold air. In the blown state, food easily loses water, reducing its freshness. Therefore, in terms of freshness preservation effect, a direct cooling refrigerator is better.
3. GivenAs the air-cooled refrigerator blows cold air, the temperature inside the refrigerator is more uniform, while there will be a certain temperature difference in various parts of the direct-cooled refrigerator.
4. Direct cooling refrigerators are traditional refrigerators, so the refrigeration technology is mature and the structure is simple, so the failure rate is low.
? During the process of boiling water, it will boil and the distilled water, which we think of as water vapor, will disperse in large quantities, and the pollutants present in the water will disperse naturally. remains in the pot. You may find that the kettle that boils the water will become dirtier and dirtier over time, due to certain macromolecules in the water. These macromolecules are harmful substances present in water. When we drink water, these subHarmful substances are precipitated into the water, so the boiled water we drink is relatively cleaner. However, if we heat water repeatedly, the substances contained in it will not continue to decrease, but will increase. in its water. Repeatedly boiled water is like leftover rice. The longer it is left and reheated, the more the nitrite content increases, which is extremely harmful to our body and can easily cause cancer.
Never boil water again after boiling it once. If you want to drink hot water a second time, you can boil the water again. However, the hot water from the water dispenser is often reheated, because as long as it is plugged in and heated, it will reheat the water to ensure the constant temperature of the water, and reheat it again when it will be slightly colder. This kind of water is not good. Therefore, the habit of manyIts people using water dispensers is to plug in the water dispenser when drinking hot water, then unplug or turn off the power switch after use. It's a kind of protection for one's own body. “Distilled water, although it does not contain any harmful macromolecules, is not good for our health because it does not contain minerals, so it is not recommended for everyone to drink distilled water . Some minerals in water are useful to the human body, but repeated heating will cause a series of chemical reactions. It is therefore strongly recommended not to reheat boiling water.