During refrigerated transportation, the temperature inside the refrigerated compartment fluctuates from high to low. When the temperature fluctuates too much, it will cause the temperature inside the compartment to be higher than the optimal retention temperature for perishable food. At the same time, it will cause condensation on the outside of the perishable food transported inside the compartment, affecting the shelf life of the perishable food and causing a negative impact on the quality assurance of the perishable food. However, there are many factors that affect the temperature fluctuations inside the carriage. Previous studies on the factors affecting the temperature fluctuations and evenness inside the carriage were mostly based on numerical simulations and experiments of refrigerated transportation processes. In terms of theoretical analysis, the temperature changes inside the refrigerated warehouse were mainly analyzed through the Laplace transform to obtain a notification function, And the frequency domain analysis method was used to analyze the theoretical and experimental characteristics of temperature fluctuations in cold storage. A refrigerated vehicle is like a moving cold storage. Some research methods for controlling temperature fluctuations in cold storage are also applicable to refrigerated vehicles, but vehicle driving is a dynamic process.
Classification of refrigerated trucks
Refrigerated cars are actually called refrigerated and insulated cars, which are divided into two categories: refrigerated cars and insulated cars.
Insulated vehicles refer to vehicles with insulated carriages suitable for short distance insulated transportation.
A refrigerated car refers to a car with an insulated compartment and a refrigeration device.
According to the refrigeration methods of refrigeration devices, there are mechanical refrigerated vehicles, refrigerated plate vehicles, liquid nitrogen refrigerated vehicles, dry ice refrigerated storage vehicles, ice cooled refrigerated vehicles, etc. Among them, mechanical refrigerated vehicles are the main type of refrigerated vehicles, and the vast majority of refrigerated vehicles in China are also mechanical refrigerated vehicles. Classified by chassis carrying capacity: micro refrigerated trucks, small refrigerated trucks, medium refrigerated trucks, and large refrigerated trucks
Car. Classified by carriage type:
Bread Refrigerated Truck, box
Refrigerated Truck, semi trailer refrigerated truck.
3. Composition of
The refrigerated truck mainly consists of car chassis, insulated and insulated compartment, refrigeration unit, temperature recorder inside the compartment, and other components. For vehicles with special requirements, such as meat hook trucks, optional parts such as meat hook, waist, aluminum alloy guide rail, and ventilation groove can be added.
Refrigerated truck chassis: Common refrigerated truck chassis in China include Jiefang, Dongfeng, Qingling, Jiangling, Jianghuai, Futian, etc. Refrigerated compartment body: usually composed of polyurethane material, fiberglass, as well as color steel plates, stainless steel, etc.
The production techniques include: sandwich board bonding for segmented assembly (commonly used), injection foaming for segmented assembly, injection foaming for overall skeleton, vacuum adsorption bonding, etc.
Refrigeration unit for refrigerated trucks: Refrigeration units are divided into non self powered refrigeration units and self powered refrigeration units. Domestic and imported units, etc. Ordinary car models all accept external refrigerators, while a few micro refrigerated cars accept internal refrigerators. For refrigerated trucks with lower temperature requirements, a built-in cold plate (equivalent to an evaporator) can be accepted.
