What's the difference between a low-temperature refrigerator and an ordinary refrigerator?

1, temperature difference:

The lowest temperature of ordinary refrigerator is-18 degrees, which is the lowest guaranteed temperature of household refrigerator. ?

Common low-temperature refrigerators are generally divided into -40 degrees, -90 degrees,-1 10 degrees,-130 degrees,-160 degrees and so on. There will be some differences in the temperature division of low-temperature refrigerators produced by various manufacturers.

2. Different uses:

Ordinary refrigerators are mainly for home use, used to store food and so on.

The low-temperature refrigerator is mainly used for scientific research, preservation of medical supplies, low-temperature experiments and storage of special materials such as biological products, marine products, electronic components and chemical materials.

3, the refrigeration principle is different:

There are two kinds of ordinary refrigerators: gas absorption type and semiconductor type.

The principle of gas absorption refrigerator is to use heat source as power. Ammonia is often used as refrigerant in gas absorption refrigerator, which can form the evaporation condition of liquid ammonia. At the same time, it also uses hydrogen as diffusion agent and uses the mixed solution of ammonia, water and hydrogen to complete the refrigeration work.

The principle of semiconductor refrigerator The semiconductor refrigerator mainly works by using the Peltier effect produced by semiconductor materials. It uses P-type semiconductor and N-type semiconductor to make a pair, which will generate heat and heat absorption at its nodes after direct power supply, thus achieving the purpose of refrigeration.

The refrigeration system of low-temperature refrigerator adopts the working principle of a new generation of single compressor automatic cascade refrigeration technology. Generally, two compressors are used as high and low temperature compressors.

The copper tube of the low-temperature evaporator is directly attached to the outside of the inner box in the form of a coil, and the gap between the coil and the box wall is filled with heat transfer glue to increase the heat transfer effect. The condensing evaporator is shell-and-tube structure, with four-tube threaded copper tubes inside, and adopts countercurrent heat exchange mode.