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Refrigerator trucks need to ensure the stability of the temperature during the delivery of goods. Not only the cargo compartment, but also the freezer, the packaging and loading of the goods are also one of the factors affecting the temperature.
Refrigerated goods need to be sealed with a good packing box, seafood, vegetables, fresh products should use a vented box. The packing box must have certain pressure resistance so as not to damage the goods due to extrusion deformation.
Before the cargo is loaded, the cargo bed is pre-cooled, the thermostat is set at the desired temperature, the refrigeration unit is turned on, and the pre-cooling is about 1.5 hours to discharge the heat in the cabin. Because the vehicles are generally parked in the open air or in a garage, the cabin temperature is similar to the ambient temperature. Goods transported by refrigerated trucks are articles that cannot be stored at room temperature for a long time. Therefore, the carriage must be allowed to reach the specified temperature before loading.
However, the chiller units must be shut down during loading and unloading. This is a point that many people ignore. It is a wrong practice for many people to load and unload frozen cargo. Because: After the pre-cooling of the carriage is completed, the front of the fan is positive pressure and the back is negative pressure. The fan of the unit will suck the hot air from outside into the carriage, causing the temperature inside the carriage to rise and lose the pre-conditioning. The effect of cold; if it is in the off state, although there will be alternating flows of hot and cold air, but the speed will be much slower.
There is a misconception that the freezer is used to cool down, load goods that do not meet the transport temperature requirements into the carriage, set the refrigeration unit to its required transport temperature, and reduce the temperature of the cargo to a certain time or Raise to the required temperature. Actually, refrigerated trucks can maintain the temperature of goods, but they cannot reduce the temperature of goods. Doing so will only damage or deteriorate the product. Therefore, the articles to be transported must also be precooled to the required temperature for transportation, and must be kept in line with the temperature of the passenger compartment. This can effectively prevent the loss of moisture due to changes in the temperature of the articles, and the change in quality can shorten the shelf life of the goods.
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