Set the thermostat at the desired temperature, pre-cool the car for 1.5 hours to remove the heat trapped in the car; turn off the refrigeration unit when loading, and load quickly.
When loading, the refrigerated truck must be pre-cooled or pre-heated. Because the vehicle is parked in the open air, the cabin temperature is usually the outside ambient temperature. If the temperature of the goods being transported is not the ambient temperature, and the goods are loaded into the compartment, the ambient temperature will affect the temperature of the transported goods, resulting in changes in the quality of the transported goods. Therefore, the carriage must be pre-cooled to the required temperature before loading. However, the refrigeration unit must be switched off during loading (same as unloading). Many people do not turn off the refrigeration unit when loading and unloading goods. In fact, this is a very wrong operation.
The reason is: when we pre-cool the car, if we do not shut down the car and open the car door, because the fan of the evaporator of the refrigeration unit is working, the front of the fan is positive pressure, and the back of the fan is negative pressure, so the cold air flows from the upper part of the car. Blow out, and the lower part will quickly suck in the hot air from the outside, which will cause the temperature in the car to rise rapidly; if the cargo is loaded and unloaded after the machine is turned off, because the fan is in a stopped state, the air flow stops, and the air pressure inside and outside the car is the same, which makes the external heat. The speed of air transfer into the cabin is relatively slow.
Pre-cooling and heat preservation
The cargo must be pre-cooled to the required temperature, and the temperature of the cargo is checked during loading; the refrigeration unit is used to maintain the temperature of the cargo, not to reduce the temperature of the cargo.
Many users of refrigerated trucks have a wrong concept, and always think that the refrigerated truck unit on the truck can freeze or heat the goods loaded into the compartment to the required temperature at will. Therefore, the cargo that is not enough to be transported is loaded into the compartment, and then the refrigeration unit is set to the required transport temperature, and the temperature of the cargo is lowered or raised to the required temperature within a certain period of time. However, the fact is the opposite. Not only does the temperature of the goods fail to fall (or rise), but the goods are damaged or deteriorated. Because the refrigeration unit of the refrigerated truck does not lower the temperature of the cargo, but maintains the temperature of the cargo, it wraps the cargo like the quilt we used to sell cold drinks in the past. When the external cold (heat) source enters the car through radiation, conduction and convection, it is taken away by the cold air blown by the refrigeration unit, and the heat source is isolated from entering the cargo.
Therefore, when loading the goods, the temperature of the loaded goods must be measured first. If the set point temperature of the refrigeration unit is higher or lower than the cargo temperature, it is difficult for the cargo temperature in the cabin to reach the temperature required for transportation. The storage temperature of the goods must be consistent with the transportation temperature. If the temperature of the goods changes frequently, moisture will be lost, which will lead to changes in the quality of the goods, which will shorten the shelf life of the goods.
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