Why Can't the Temperature in a Refrigerated Truck Drop?
2 Answers
The reasons why the temperature in a refrigerated truck cannot drop: Cargo stacking: When stacking goods, avoid placing too many items in front of the evaporator outlet of the refrigerated truck, as this can obstruct the flow of cold air. Blockage above the goods can cause a short circuit in the cold air circulation. Cargo height: A minimum distance of 220 millimeters must be maintained between the top of the goods and the roof of the refrigerated truck. Ensure that the height of the loaded goods does not exceed the balance height of the air outlet. If the air outlet is blocked by goods or too close to them, it will not only affect the storage and transportation temperature of the goods but also disrupt the normal operation of the refrigerated truck's refrigeration unit. Defrosting status: Some refrigerated truck refrigeration units are designed with air-sensing defrosting. When goods are too close to the air outlet, the coils in the evaporator of the refrigeration unit will quickly frost or freeze. At this point, the air-sensing system activates, and the refrigerated truck unit will quickly enter the defrosting mode.
The refrigerated truck's temperature won't drop. I've been in transportation for many years and encountered this situation several times. Sometimes it's due to aging refrigeration units with insufficient compressor power, resulting in poor cooling performance. Another time, it was because the door seals were worn, allowing hot air to continuously seep in and waste the cold air. Overloading or improper cargo stacking can also block air vents, making it impossible to lower the temperature. I remember the most critical situation was during summer when the ambient temperature was too high, and even continuous operation of the unit couldn't keep up—almost ruining a whole shipment of seafood. Now I've developed the habit of checking the refrigeration system before every trip and regularly replacing insulation materials. If there's any issue, I immediately go to professional repair shops—never tinkering with it myself, as the cost of damaged goods would be unaffordable.
