When it comes to transporting perishable products over long distances, the term “refrigerator truck” often comes into use. This phrase has become a common noun to refer to any large cargo transport capable of maintaining a low temperature in the body. However, you are unlikely to find such a definition in professional logistics and technical documentation. Vehicle has more precise names that depend on its design, type of cooling and purpose. Understanding the correct terminology is necessary not only for drivers and logisticians, but also for entrepreneurs planning cargo transportation.
First of all, you should distinguish between the car itself and the tow hitch. If the tractor is carrying a semi-trailer with a thermally insulated body, then the entire structure is called refrigerated road train. If cooling is not required, but only thermal insulation is needed, the term “isothermal van” is used. Refrigeration unit is the heart of such transport, it is it that creates and maintains the cold. Errors in names can lead to misunderstandings when ordering equipment or searching for spare parts, so it is important to immediately understand the classification.
In this article we will analyze in detail how to correctly name different types of refrigerated cargo transport, what is the difference between refrigerator and isotherm, and also consider the features of their operation. You will learn what types of bodies exist and what to look for when choosing equipment for business. Accuracy of wording will help you look like a professional in the eyes of partners and suppliers.
Official terminology: refrigerated or isotherm?
The main mistake that Many admit that the concepts of “refrigerator” and “isothermal van” are confused. Although these vehicles may look similar on the outside, their internal structure and capabilities are radically different. Isothermal van (or simply isotherm) is a body made from sandwich panels with a high thermal insulation coefficient. It does not have its own source of cold. It only slowly releases the temperature of the cargo, be it warm or cold. Such vehicles are used for short flights or transportation of goods that do not require strict temperature conditions.
Unlike the isotherm, refrigerator is equipped with an autonomous or driven refrigeration unit. It is the presence of an active source of cold that gives the right to call a truck a refrigerator. The installation can operate from a car engine, from a separate diesel generator, or from the electrical network when parked. This allows you to maintain a given temperature (for example, -18°C or +4°C) regardless of environmental conditions and the duration of the flight. Thermoregulation in such systems occurs automatically.
⚠️ Attention: When When ordering transport, check whether the body is equipped with an active refrigeration unit. An isothermal van will not be able to keep the cold for a long time without first freezing the cargo and will heat up very quickly in the summer heat.
The term road trainis also often found in the documentation. This is the official name for a tractor-trailer hitch. If a refrigerated semi-trailer is attached to the tractor, then technically it is a “refrigerated semi-trailer road train.” The word “truck” is colloquial and comes from the German “Fuhre” (cart, load), but you won’t find it in technical data sheets. For accuracy of description, always indicate the type of body and the presence of a refrigeration unit.
Design and types of refrigeration units
The key element that turns an ordinary truck into a “refrigerator truck” is the refrigeration unit. The cost of transportation, reliability and temperature range depend on its type. There are several main types of drives, each of which has its own advantages. Diesel units most common in long-haul transportation. They are autonomous, powerful and do not depend on the tractor engine, which allows them to remain cold even when the driver is parked and resting.
The second popular option is units driven by car engine. In this case, the refrigerator compressor is connected by a belt to the tractor engine. These systems are cheaper to maintain and quieter, but have a significant drawback: they do not work when the truck's engine is turned off. To maintain the temperature in parking lots, additional electric parking systems or manual control of engine speed are often required, which is not always convenient and economical.
Third type - multi-temperature systems. They allow you to divide the body into compartments with different temperatures. For example, in one part you can carry frozen fish, and in the other - chilled vegetables. This is achieved through additional partitions and independent cooling circuits. Such solutions are difficult to set up, but are indispensable for combined cargo.
- 🚛 Autonomous diesel: independent operation, high power, suitable for long-distance flights.
- ⚙️ From the engine: economical, lighter weight, but requires work tractor motor.
- 🔌 Electric drive: silence, environmental friendliness, ideal for night unloading in the city.
Types of bodies and their purpose
Not all “refrigerated trucks” are the same. The shape and volume of the body are selected to suit the specifics of the cargo. The standard solution for international and intercity transportation is eurotruck with a semi-trailer 13.6 meters long. Its volume is usually about 82-86 cubic meters. Such dimensions allow for the most efficient use of space when transporting palletized goods. The walls of such bodies are made of durable sandwich panels, often with a metal “gallery” for protection from mechanical damage.
For urban transportation and door-to-door delivery, more compact options are used. Refrigerated trucks (the so-called “five-ton” or “ten-ton”) are long bodies from 4 to 8 meters. They are more maneuverable and can enter city centers where the movement of large vehicles is limited. There are also specialized bodies: isothermal tanks for liquid products (milk, juices) and refrigerated scrap trucks for waste collection.
| Body type | Length (m) | Volume (m³) | Loading capacity (t) |
|---|---|---|---|
| Semi-trailer (Eurotruck) | 13,6 | 82-86 | 20-22 |
| Tent/Van (Medium) | 6-8 | 30-45 | 3-10 |
| Low-tonnage truck | 3-4 | 10-18 | 1,5-3 |
| Thermos tank | Varies | 10-30 | Depends on the axle |
It is important to consider not only the volume, but also loading capacity. Overloading the refrigerator is dangerous because it can disrupt the circulation of cold air. Special air channels must remain in the body (usually on the floor and near the walls) so that the cold flow from the installation is evenly distributed throughout the entire volume. If the cargo is placed close to the ceiling or walls, “heat pockets” may form in the far corners where the products will deteriorate.
Temperature classes and loading rules
The efficiency of the “refrigerator truck” directly depends from the correct temperature. In logistics, classification according to temperature ranges is accepted. There are refrigerated trucks for deep freezing (down to -25°C), for chilled products (from 0°C to +10°C) and even for warm cargo (above +10°C, for example, for transporting live plants or chocolate in winter). The wrong choice of mode can lead to damage to goods or defrosting of equipment.
A critical aspect is the pre-sale preparation of the cargo. Products must be loaded already chilled or frozen to the desired temperature. Refrigeration unit the van is designed to maintain temperature, not to initially freeze hot or warm cargo. If you load warm goods into the refrigerator, the unit will wear out, and the quality of the products deep in the body may suffer due to condensation and uneven cooling.
⚠️ Attention: Always check the thermostat settings before loading. The installation must reach operating mode in advance. Do not rely on the fact that it will “cool” the cargo in transit.
When loading, the air circulation rule must be observed. Cold air is supplied from above and must be able to fall downward, passing through the load. Therefore, rails are often installed on the floor of the refrigerator, which create a gap between the floor and the goods. The absence of such a gap or the use of trays without legs can completely block the air flow, rendering the operation of the refrigerator useless. aluminum guides (rails) that create a gap between the floor and the product. Lack of such clearance or the use of trays without legs can completely block the air flow, rendering the operation of the refrigerator useless.
Maintenance and common problems
Like any complex mechanism, a refrigeration unit requires regular maintenance. Owners of “refrigerator trucks” know that equipment downtime during a flight due to a refrigerator breakdown can cost an entire cargo. The main problems are related to refrigerant leakage, contamination of the condenser or a malfunction of the thermostat. Condenserlocated outside the body, often becomes clogged with lint, dirt and insects, which sharply reduces the efficiency of heat transfer.
Regular washing of the condenser and checking the tension belts is a mandatory procedure before each flight. It is also necessary to monitor the oil level in the unit’s engine and the condition of the air filters. In modern electronically controlled systems, there are often failures in temperature sensors that may show incorrect data. Diagnostics Such systems require special equipment and qualified personnel.
☑️ Daily inspection of the refrigerator
Particular attention should be paid door seals. Rubber gaskets around the perimeter of doors wear out over time, crack or lose elasticity. Through even small cracks, warm, moist air constantly enters the body. This leads not only to an increase in the temperature inside, but also to the formation of ice on the evaporator and “sweating” of the products. Replacing seals is an inexpensive but vital procedure for maintaining cold.
Economic aspects and choice of equipment
Purchasing or renting a “refrigerator truck” is a serious investment. The cost of a new semi-trailer refrigerator is significantly higher than its conventional tilt counterpart. However, for a food-related business, these are unavoidable expenses. When choosing equipment, you should pay attention to the brand of the refrigeration unit. Market leaders, such as Thermo King, Carrier or Frigoblock, provide better maintainability and availability of spare parts in any major city.
An important factor is fuel efficiency. A diesel unit can consume from 1.5 to 4 liters of fuel per hour, depending on the outside temperature and the set mode. On long flights (for example, Moscow-Vladivostok), the difference in consumption between the old and new installation can be thousands of dollars. Therefore, when purchasing used equipment, you should carefully check the engine hours and service history of the unit.
Hidden costs of maintaining a refrigerator
In addition to fuel and repairs, consider the cost of pre-trip preparation (washing, disinfection), annual verification of temperature recorders (required by food law) and cargo insurance. Lack of a valid washing certificate may result in a fine and a ban on entry into large retail chains.
It is also worth considering the option of renting (leasing) equipment. The logistics services market offers flexible conditions that allow you to renew your fleet without withdrawing large working capital. For seasonal businesses, such as transporting fruits in summer or vegetables in winter, renting can be more profitable than buying. The main thing is to clearly understand your needs in temperature conditions and dimensions, so as not to overpay for unnecessary functions.
What is the difference between a refrigerator and an isothermal van?
The refrigerator has its own refrigeration unit, which actively cools the cargo. An isotherm is just a thermos on wheels, it only maintains temperature, but does not generate cold.
Is it possible to carry frozen food in a regular truck?
No, a regular truck (tent or van) does not have thermal insulation. Products will defrost or spoil within a few hours, especially in hot or cold weather.
How often should a refrigerator be washed?
For food cargo, washing and disinfection are required before each loading of a new batch, especially if the types of products change (for example, milk is carried after fish).
What is it? multi-temperature mode?
This is an opportunity to divide the body into zones with different temperatures. For example, in one part -18°C, in another +5°C. Requires special equipment and partitions.
Why does ice form in the refrigerator?
Most often this is a sign of poor air circulation (the load has blocked the flow) or a malfunction of the evaporator defrost system. It is also possible for moist air to enter through leaky doors.