With the development of the cold chain transportation market, in order to save costs, many heads of households clearly need to cool the stored goods without being cooled in the cold storage, but are directly loaded and transported, hoping to rely on the refrigeration unit of the refrigerated truck to cool down. However, due to the incentives of competition in the cold chain transportation market, riders have to load trucks for transportation. In fact, this is very risky, and it is easy to cause deterioration and damage to the goods. Because strictly speaking, the refrigeration unit is to maintain the temperature of the cargo, not to reduce the temperature of the cargo. So what should we do if the temperature of the refrigerated truck cannot drop?
1. First of all, we must first understand the working principle of the refrigeration unit: the refrigeration unit of the refrigerated truck uses the compressor to drive the refrigerant to convert between the condenser and the evaporator, and the evaporator and the condenser mainly heat through the air Exchange to change the surrounding environment. In order to better contact with the air, it is important to keep the surface clean. It is recommended to clean the evaporator and condenser of the refrigeration unit frequently to make it absorb and dissipate heat well.
2. The cooling of the refrigeration unit relies on the evaporator to cool down and absorb heat, so try to avoid the evaporator in the cargo box for a long time and cause the refrigeration unit to stop for too long.
For example, many lotus roots transported in the market are loaded directly from the water, and the moisture will be very large. If the ambient temperature is too high, it is easy to form a large amount of water vapor and cause the refrigeration unit to frost. In addition, the directly picked fruits and vegetables have field heat and breathing heat. The heat is very large, and the heat conversion through the evaporator and condenser of the refrigeration unit is also very slow. These are easy to form a large amount of hot air and water vapor, which can easily cause frosting of the refrigeration unit. Although the refrigeration unit has an automatic defrost function, the defrosting speed is too slow and incomplete, and it is easy to cause repeated frosting-defrosting of the refrigerator -The temperature of the cargo is also easy to rise when the machine is stopped. The direct effect is that the refrigeration unit cannot be cooled down. It is recommended that when installing a refrigeration unit, choose a larger model refrigeration unit, which has fast air outlet speed and large cooling capacity, and must have a heating defrost function, which can defrost quickly and thoroughly, and the refrigeration unit can continue to work quickly.