Let's talk about the refrigeration unit. If you run long distances or transport goods with hot air without ventilation ducts, it can only reflect 30% of the value of a refrigerated truck. The cold air outlet is usually located at the top of the body box and front section, if there is no air channel slot.

When there is water in the goods, it cannot be discharged, and the bottom goods will rot.

When filled with goods, the cold air from the condenser can only blow onto the goods, and the bottom of the car compartment will gradually heat up. There is a ventilation duct that blows cool air to the rear door of the car compartment.

3. If the goods are loaded with a large amount of hot air, it is difficult for the hot air to evaporate. Use air ducts to take away a large amount of hot air, and at the same time, the ice cubes in the middle help absorb heat. Ventilation ducts not only ensure effective cooling of the goods, but also help save fuel consumption costs.

The main reason for the spoilage and deterioration of aquatic products is that the microorganisms contained in the aquatic products themselves or those contaminated during storage and transportation grow and reproduce under suitable conditions, decompose the proteins, amino acids, fats and other components in the fish body, and produce different odors and toxic substances, leading to the spoilage and deterioration of aquatic products.

On the other hand, under certain environmental conditions, the enzymes contained in aquatic products themselves can promote fish spoilage. During the storage and transportation process of refrigerated trucks, these two factors need to be well controlled in order to ensure the quality of aquatic products and achieve the purpose of preservation.

The environmental temperature and humidity are closely related to the growth and reproduction of microorganisms. The more water in aquatic products, the easier it is for microorganisms to reproduce. It is generally believed that microorganisms can only grow and reproduce when the moisture content is above 50%. When the moisture content is below 30%, microbial reproduction begins to be controlled. When the moisture content is below 12%, it is difficult for microorganisms to reproduce.

Temperature is an important condition for the growth and reproduction of microorganisms. The suitable growth temperature for different microorganisms varies. If the temperature exceeds the suitable range for growth, it will stop growing or die. The function of enzymes is also closely related to temperature.

At around 37 ℃, it has strong decomposition ability and fast chemical reaction rate. As the temperature increases, the enzyme's ability to decompose increases, and when the temperature exceeds a certain range, the enzyme begins to be destroyed. Therefore, lowering the temperature can cause microorganisms to stop reproducing or even die, weaken or lose the ability of enzymes to decompose, and prolong the freshness of aquatic products.