For Cold King agents, let's talk about using non ventilated packaging boxes for frozen goods and side ventilated packaging boxes for fresh goods. The packaging box should be pressure resistant. Due to the fact that frozen goods are not allowed to have wind blowing over the surface, as wind blowing over the surface of frozen goods can cause loss of moisture in the goods, resulting in a decrease in the quality of the goods. This year, our country has formulated a policy that prohibits the sale of bulk frozen food, and packaging for sale is the principle behind it. Due to their own characteristics, fresh products are still in a breathing state during storage and transportation. If they are not well ventilated, the goods will deteriorate and be damaged. Therefore, it is necessary to ensure good ventilation and air exchange for such goods.

Set the thermostat to the desired temperature and pre cool the cabin for 1.5 hours to remove any heat trapped inside the cabin; Turn off the refrigeration unit during loading and load quickly.

When loading, the carriage should be pre cooled or preheated first. Because the vehicle is parked outdoors, the temperature inside the cabin is usually the temperature of the external environment. If the temperature of the transported goods is not the ambient temperature, and the goods are loaded into the carriage, the ambient temperature will affect the temperature of the transported goods, resulting in a change in the quality of the transported goods. Therefore, the carriage should be pre cooled to the required temperature before loading. However, the refrigeration unit should be turned off during loading (just like unloading). Many people do not turn off the refrigeration unit when loading and unloading goods, which is actually a very wrong operation.

The reason is that after pre cooling the carriage, if we do not turn it off and open the carriage door, the fan of the evaporator of the refrigeration unit is working. The front of the fan is positive pressure, while the back is negative pressure. Therefore, the cold air is blown out from the upper part of the carriage, and the lower part will quickly suck in the hot air outside, causing the temperature inside the carriage to rise rapidly; If the goods are loaded and unloaded after shutting down, the air flow will stop due to the fan being in a stopped state, and the air pressure inside and outside the carriage will be consistent, resulting in a relatively slower speed of external hot air transfer into the carriage.