The question of what a car with a refrigerator is called often arises among those who are faced with the need to transport perishable products. In everyday life, such cars are often called simply “refrigerators,” but professional terminology is much broader and more precise. The correct name depends on the type of equipment installed, the operating principle of the cooling system and the temperature regime that must be maintained inside the body.
The main difference lies in the presence or absence of its own refrigeration unit. If the body simply retains its thermal insulation properties, and the cold is created in advance, this is one type of transport. If an autonomous or driven compressor is installed inside, capable of generating cold on the way, the classification changes. Understanding these nuances is important not only for logistics, but also for the correct choice of equipment for specific business tasks.
Refrigerator: active cooling of cargo
The most common answer to the question of what a car with a refrigerator is called is refrigerator. In a strict technical sense, a refrigerator is a vehicle equipped with an autonomous or driven refrigeration unit (RU). This installation is capable of not only maintaining a given temperature, but also actively lowering it, regardless of external weather conditions.
The design of such a vehicle includes an isothermal van body and a refrigeration machine mounted on the front wall. The source of energy for the compressor can be the diesel engine of the installation itself, the electrical network (when parked) or even the car engine. Thermoking, Carrier and Transicold are well-known brands whose installations can most often be found on the modern market.
The main feature of the refrigerator is - ability to work in deep freezing mode. Such vehicles deliver frozen meat, fish, ice cream and medications that require strict adherence to temperature conditions down to -20°C and below. Without the active operation of the compressor, maintaining such temperatures on the road would be impossible.
⚠️ Attention: when accepting a refrigerator, be sure to check the operation of the unit in cooling mode, and not just temperature maintenance. A faulty sensor may be hiding a real problem with the compressor.
Isothermal van: passive temperature preservation
The second type of transport, which is often confused with a refrigerator, is isothermal van, or simply “isotherm”. The main difference is the absence of its own refrigeration unit. The body of such a vehicle is made of sandwich panels with low thermal conductivity, which allows you to maintain the temperature of the loaded cargo for a long time.
The cargo is loaded into an isotherm already cooled or frozen. The task of the driver and forwarder is to minimize loading and unloading time so as not to upset the thermal balance. Unlike a refrigerator, an isotherm cannot cool warm cargo, it only slows down its heating. This makes it an ideal choice for short city routes and distribution of products to points within one day.
The walls of such vans are often made of plastic, aluminum or stainless steel, and polyurethane foam insulation is used inside. The thickness of the walls directly affects the retention time of the cold: the thicker the insulation layer, the longer the cargo will remain fresh. For products with a short shelf life, such as bread or confectionery, the isotherm is a more cost-effective solution.
Thermal booth and cryogenerator: alternative solutions
There are other options for what a car with a refrigerator is called, depending on the technology used. For example, thermal booth is a simplified version of the isotherm, often installed on the Gazelle or heel chassis. It is designed for transporting products that do not require extremely low temperatures, and is more often used for short flights.
A more specific type is cryogenic generator. These cars do not have a traditional compressor. Cooling occurs due to the supply of refrigerant to the body from cryogenic containers (cylinders) located on the frame. Liquid nitrogen or carbon dioxide is most often used. When evaporating, these substances take away a huge amount of heat, creating powerful cold.
Cryogenic units are often used for transporting especially valuable cargo, flowers or seafood, where not only temperature is important, but also the absence of vibration from a running compressor. In addition, the evaporating gas creates an inert environment, which further preserves the product and prevents the growth of bacteria.
Below is a comparative table of the main types of vehicles for transporting cold:
| Type of transport | Presence of a compressor | Principle work | Temperature mode |
|---|---|---|---|
| Refrigerator | Yes | Active cooling | From -25°C to +15°C |
| Isotherm | No | Thermos (storage) | Depends on the load |
| Cryogenerator | No (there is an evaporator) | Refrigerant supply | Up to -60°C |
| Thermal booth | No | Storage (simplified) | Short-term |
Design of a refrigeration unit
To better understand how a car with a refrigerator works, let's consider the design of a classic refrigeration unit. It is a closed circuit through which refrigerant (freon) circulates. The main elements are a compressor, a condenser, a throttle valve and an evaporator.
The compressor compresses the refrigerant gas, increasing its temperature and pressure. Next, the hot gas enters the condenser (radiator), located outside the body, where it is blown by a fan and turns into liquid, giving off heat to the outside. After this, the liquid refrigerant passes through the expansion valve, expands sharply and cools, entering the evaporator inside the body.
The evaporator removes heat from the interior of the van. The evaporator fan forces air through the cold pipes, distributing the cooled air throughout the body. It is important that the body has the correct ventilation system floors with T-shaped profiles (aluminum guides) that ensure air circulation under the load.
What happens if the air circulation is disrupted?
If it is tight fill the space near the front wall (where the evaporator blows) with weight or leave no gaps near the floor, cold air will not be able to circulate. This will lead to the unit switching off according to the sensor, “thinking” that it is already cold in the body, while in the depths of the body the products will begin to deteriorate.
Temperature classes and ATP standards
In international logistics, there is a clear classification of vehicles, known as ATP agreement. It regulates what a vehicle should be called and equipped for transporting perishable goods (perishable goods). According to this standard, equipment is divided into classes depending on the range of temperatures maintained.
For example, class F allows you to transport cargo at temperatures not exceeding -20°C, which is important for frozen products. Classes A, B, C are intended for refrigerated cargo with temperatures above 0°C. A valid ATP certificate is required for international transportation and is confirmed by a special plate on the body.
- 🚛 Class A: from 0°C to +12°C (vegetables, fruits, chilled meat).
- 🧊 Class B: from -2°C to +12°C (products with more strict requirements).
- ❄️ Class F: not higher than -20°C (frozen fish, ice cream, semi-finished products).
- 🌡️ Class C: from -20°C to +12°C (universal range).
Violation of the temperature regime prescribed by the vehicle class can lead to damage to the cargo and legal liability of the carrier. Therefore, drivers are required to constantly monitor thermometer readings and keep temperature sheets.
Features of operation and maintenance
Operating a car with a refrigerator requires specific skills and regular maintenance. Refrigeration unit is a complex mechanism that is sensitive to the cleanliness of heat exchangers. The condenser, located at the nose of the unit, is constantly clogged with fluff, dirt and insects, which reduces the cooling efficiency.
Owners of refrigerators need to regularly, at least twice a year, wash the condenser and evaporator under pressure. It is also important to monitor the condition of the body door seals. The slightest gap will lead to a constant influx of warm, humid air, ice formation on the evaporator and overload of the compressor.
☑️ Daily inspection of the refrigerator
⚠️ Attention: never Do not wash the condenser with water under pressure strictly perpendicular to the radiator fins - this may bend the thin aluminum plates. The jet must be directed at an angle, blowing dirt from the inside out.
Another important aspect is pre-start preparation. Before loading, the body of the refrigerator must be “pierced”, that is, cooled to the desired temperature in advance. Loading warm cargo into a refrigerator is strictly prohibited, since the installation is not intended for freezing, it serves to maintain the temperature.
Frequently asked questions (FAQ)
What is the main difference between a refrigerator and an isotherm?
The main difference is the presence of an active refrigeration unit. The refrigerator has a compressor and can cool the cargo itself or maintain sub-zero temperatures in hot weather. An isotherm is simply a well-insulated “thermos” that only slows down the change in temperature of the cargo loaded into it.
Is it possible to transport discreet products in a refrigerator?
No, absolutely not. The refrigerator does not know how to freeze warm cargo. If you load warm meat, the compressor will work hard, trying to cool the huge amount of heat, but most likely it will burn out or fail, and the product inside will begin to deteriorate due to condensation and incorrect temperature schedule.
How often do you need to undergo an ATP test?
The ATP Certificate of Compliance is issued for 6 years for new vehicles, but requires periodic inspections (re-examinations) every 3 years. For used vehicles undergoing certification for the first time, the validity period may be shorter. It is better to check current rules with certification centers.
Why is it important to leave air gaps in a refrigerator?
Cold air is heavier than warm air and spreads along the bottom, but in refrigerators it is supplied under pressure. In order for the temperature to be uniform, the air must circulate: pass along the floor, rise through the load and return to the evaporator. If the load is pressed against the walls or floor, “heat pockets” are formed where the food will spoil.