Brief introduction of refrigeration principle of refrigerated truck

Refrigerated vehicles are one of the more common special vehicles in modern day-to-day production activities. In supermarkets, there are various types of frozen food transport vehicles. In hospitals, there are vehicles containing a large number of refrigeration equipment. It can be said that refrigerated trucks are ubiquitous in our lives. Especially in this hot summer season, who does not want to eat cold food? However, even with such common vehicles, we do not necessarily know much about them. Maybe many people have never paid close attention to the refrigeration principle of refrigerated trucks, just like your family does have a refrigerator, but you certainly do not want to Assemble or transform because you don't know what exactly it is. Now let me introduce you to the general principle of this kind of application.

1. Liquid nitrogen refrigeration. People with a little bit of chemical knowledge will know that liquid nitrogen is a chemical substance that can rapidly cool down, and its boiling point is more than 100 degrees. It is an extremely stable element. Therefore, it is widely used in medicine and industrial production. Applications. However, due to the high cost of its use, promotion is still difficult.

2. Water ice and salt ice cooling. Compared with liquid nitrogen, water ice refrigeration has lower cost and less cost, but it has a fatal weakness that is poor cooling and cooling capacity, coupled with the refrigerated truck can not make 100% of the heat is not lost, so the effect is not Especially good. In addition, when salt ice is used, it may also be caused by unintentional accidents that lead to leakage and melting, resulting in the occurrence of pollution and damage to the machine. In general, this refrigeration method is mostly used for the transportation and storage of aquatic products.

3. Dry ice cooling. Dry ice is a form of carbon dioxide, and its principle of refrigeration is mainly in the process of sublimation, it needs to absorb a lot of heat, so that the ambient temperature decreases. The operation is simple and convenient, and the investment cost is relatively low, but due to the high cost of use, it has not been applied to the refrigerated transport of goods. The use of dry ice has both advantages and disadvantages. On the one hand, it can reduce the biological respiration of fruits and vegetables and keep them fresh. On the one hand, it is prone to frost, which is not conducive to the control of the temperature inside the vehicle.

It is probably these kinds of cooling methods that are common in life. In the coming years, there may be more efficient and cheaper cooling methods waiting to be discovered and widely used.

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