What is the average time for my reefer to cool from 75° to -15 °?
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To answer the question of how quickly your refrigerator in a commercial vehicle will cool from 75° to -15°, you need to understand how the whole system works.
Such a system of a truck with a trailer consists of a power supply system, cooling circuits, air distribution systems, and a control system, which are combined into a device mounted on a trailer. The main cooling circuit includes a compressor, an evaporator radiator, a condenser radiator, an expansion device, tubes, and valves. At an outdoor temperature of +30 C, such a semi-trailer lowers it inside the body and then maintains it in the range from +12 to -20 degrees, depending on the requirements of this cargo, the degree of tightness of the van, and the type of refrigeration unit.
In addition to the refrigerators themselves, the semi-trailer can act as a glacier or a heated vehicle. The source of cold in the van is eutectic plates, dry or natural ice, and liquefied gases. Inside the body, the temperature can range from +7 °C to -20 ° C. If carriers need to constantly transport several cargoes at different temperatures, then they can order the manufacture of multi-temperature refrigerators.
The refrigerator is manufactured in two versions:
The second option has a reduced curb weight and increased load capacity. Sometimes, to facilitate the chassis for refrigerators, the design is made semi-frame. But we should not forget its main drawback — the likelihood of cracks at the junction of the saddle pad with the frame. To prevent the movement of cargo inside the van and for convenient sorting of it, removable mesh partitions can be installed inside the van. All components of the refrigerator must correspond to each other, as well as to the selected temperature regime inside the semi-trailer.
How quickly can such a system cool down? Different refrigerators have different cooling rates. This is also influenced by the firm of the refrigerator and external weather conditions - humidity and air temperature. In stable conditions, the refrigerator will need only 2 hours for complete cooling. In cases with older devices or in worse weather conditions, cooling can last up to 7 hours.