Semitrailer-refrigerator – is a semitrailer with isothermal van of sandwich panels and refrigeration equipment for the transport of frozen and perishable products that require the most reliable thermal insulation from the external environment. At an average outdoor temperature of +30 º C semi-refrigerator reduces its inside the body and then supports within the range of +12 ° C to -20 ° C, depending on the degree of tightness of the van, the type of refrigeration unit and the requirements of the consignment. The trailers can play the role of the glacier and the heated vehicle. In the first case, the source of cold in insulated vans is eutectic plates, natural or dry ice, liquefied gases.

The temperature inside the body in this case can be supported from +7 ° C to -20 ° C. Heating installation enables to raise the temperature inside the empty insulated vans and maintain, without additional heat at a level not lower than +12 ° C with an average outdoor temperature of -20 ° C for at least twelve hours. If there is a need to carry multiple loads at different temperatures, it can be producing so-called multi-refrigerated semi-trailers. Refrigerated semi-trailers are designed for operation in ambient temperatures from -40 ° C to +40 ° C and relative humidity of 80%.

Typically, the walls of refrigerated semi-trailers are made from monolithic sandwich panels with thickness from 4 to 8 cm, joined together by internal and external elements of the frame. Joints in sandwich panels run tight, non-thermal bridges. Seals doors of elastic wear-resistant rubber profile provide reliable insulation. As an insulating layer in refrigerated semi-trailers polyurethane foam, density 60 kg / m 3 is used, it has the lowest coefficient of thermal conductivity (0.035 W / m 2). Polyurethane foam passed the test for toxicity and deemed safe to use as a thermal insulator. It also proved its resistance to rot, mildew and exposure of microorganisms.

The steel of different thicknesses, as well as corrugated steel, corrugated aluminum, casting of polymer materials (with or without abrasive) can be flooring. Refrigerated semi-trailers are manufactured in two versions: the chassis board trailer – with loose-sandwich-panel floor and a special chassis designed for use with a load floor panels, fastened directly to the chassis. The second option has a reduction in curb weight and increased capacity. Do not forget its main drawback – the possibility of cracks at the junction of the frame with a saddle pad.

Some manufacturers make refrigerated vans on a modular scheme that allows design to dismantle the frame, and then gather back. To prevent the movement of goods inside the van or to make it easier to sort it, removable mesh partitions can be installed in the wagon. Refrigerated semi-trailers must be especially protected from corrosion and mechanical damage, because to restore integrity will be difficult. The same applies to the issue of additional side doors. It is convenient for loading and unloading, of course.

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