Refrigerated vehicles (commercially referred to as insulated refrigerated vehicles or simply refrigerated trucks in the industry; their English equivalents are refrigerated truck or reefer truck) are enclosed box-type transport vehicles equipped with professional refrigeration and insulation systems. Their core function is to maintain a stable, controllable temperature inside the cargo compartment, ensuring temperature-sensitive goods remain uncompromised in quality during transit. As a core piece of equipment for cold chain logistics, they are widely deployed across various temperature-controlled scenarios.
Core Components
Automotive Chassis
As the primary load-bearing platform of the entire vehicle, this component integrates the engine, frame, wheels, and transmission system to deliver power output and load-bearing support. Its structural design follows the same framework as conventional freight truck chassis, though select models are specially reinforced to meet the load requirements of the refrigeration unit.
Insulated Cargo Box
As the core component for thermal isolation, its interior is filled with high-density insulation materials such as polyurethane foam. The inner and outer panels are constructed from materials including fiberglass, aluminum alloy, or stainless steel. This composite structure offers excellent airtightness and low thermal conductivity, effectively blocking the infiltration of external heat and thereby reducing the energy consumption of the refrigeration system during operation.
Refrigeration Unit
The core component for temperature control, categorized into two primary types:
Independent Refrigeration Unit: Equipped with its own dedicated engine to power the refrigeration system, it boasts robust cooling capacity and can operate continuously even when the vehicle's main engine is shut down. It is ideally suited for long-haul cold chain transportation.
Non-independent Refrigeration Unit: Driven by the vehicle's main engine, it features a simplified structure and lower cost, making it suitable for short-distance urban delivery applications.
Temperature Monitoring and Control SystemIt comprises temperature sensors and display terminals, with remote data transmission modules fitted in some high-end models. This system enables real-time monitoring and recording of the cargo compartment temperature, and it can synchronize temperature data with the vehicle's GPS location information to a cloud platform for full-process traceability management.
Main Refrigeration Methods
Mechanical RefrigerationThe most widely adopted refrigeration method, operating on the principle of vapor compression refrigeration cycle. It offers a broad temperature adjustment range (typically -25℃ to +20℃), capable of meeting diverse needs including freezing, refrigeration, and preservation. It is suitable for all types of long-, medium-, and short-haul transportation.
Cold Plate Refrigeration
Using eutectic salt as the cold storage medium, the cold plates are pre-frozen to store cold energy. During transit, the cold plates release cold energy gradually to maintain the desired temperature. Cold Plate Refrigeration Method
This method operates with zero noise and vibration, but its cold storage capacity is limited. As such, it is ideal for the medium- to short-distance transportation of small-batch low-temperature goods.
Cryogenic Refrigerant Cooling Method
Direct cooling with cryogenic media (e.g., liquid nitrogen and dry ice) enables ultra-rapid temperature reduction and the creation of an ultra-low temperature environment. However, this method entails high refrigerant costs and requires frequent replenishment of cryogenic materials. It is therefore primarily used for transporting goods with stringent rapid-cooling requirements (such as certain biological products).
Main Application Scenarios
Refrigerated vehicles are the core carriers of cold chain logistics, primarily used to transport the following categories of goods:
Frozen foods: Such as ice cream, frozen meat, quick-frozen dumplings, and frozen seafood, which require storage in a low-temperature environment below -18℃.
Fresh agricultural products: Such as fruits and vegetables, fresh milk, and fresh-cut flowers, which need to be kept in a 0℃ to 10℃ refrigerated environment to slow spoilage and degradation.
Pharmaceuticals and biological products: Such as vaccines, blood products, and certain clinical drugs, which have strict requirements for temperature stability and demand constant temperature monitoring throughout the entire transportation process.
