Simulation Research On The Cold Storage LNG Refrigerated Truck With Multi-Temperature Zone

China is the largest producer of agriculture and animal husbandry.Meat,aquatic products and eggs are among the best sold in the world.The structure of agricultural products is also quietly changing,from the direct selling of crops to the expansion of agricultural and sideline products.Within the city Refrigerated transport gradually formed the form of "small batch and multi-category";fresh e-commerce mushroomed and thrived,all of which stimulated the demand of refrigerated trucks and raised higher requirements on the quality of refrigerated trucks.However,for a long time,China’s cold chain transportation technology has been relatively backward compared with the world average level.Refrigeration units are dependent on imports and the structure of the car body is single.This makes the development of new technologies for refrigerated trucks extremely urgent.In this paper,a case of a 6.2 m dual temperature refrigerated truck in Jianghuai Weiling was taken as an example.The physical model and mathematical model of refrigerated car and refrigerated car were established respectively.The heat transfer theory was used to calculate the cooling load in the process of transportation.Cooling performance after the car and the heat exchange process of the cold recovery system,through the empty warehouse status simulation results analysis,get the appropriate air supply speed 13m/s.The article mainly explores the air flow organization in the full warehouse state.It is found that the cooling effect of the tail of the refrigerated trunk is better than that of the front part,the cooling effect of the lower part is superior to the upper part,and the ventilation aisle will improve the cooling effect.The overall temperature change in the freezer compartment is within 3.5K,and the air distribution is even,and the design is more reasonable.The surface temperature of the cargo in the refrigerated storage area is 277K,and the temperature is reasonable.Because of the heat transfer of the partition plate to the cold storage area,Wind,to avoid direct air cargo is "air-dried" problem,the front of the refrigerated compartment cooling effect is obviously better than the rear.In addition,in order to improve the cold energy utilization efficiency of LNG,this paper presents a design-storage of carburetor,carburetor is the main component of the cold recovery system,LNG vaporization pipe wrapped in a thickness of 35mm coolant,horizontal 6 Pipe snake-shaped connection,a total length of 13.2m,perpendicular to the direction of the air flow arrangement,the choice of a concentration of 60%ethylene glycol aqueous solution as a coolant,the program design goal is to maintain two hours when the goods are frozen and refrigerated.For the whole system,the coolant acts as a refrigerant and avoids the great temperature difference heat exchange between the LNG and the air,avoiding frost on the outer wall of the pipe and reducing the heat exchange efficiency of the system.In this paper,this design was simulated and found that this design theory can be achieved,and the cold recovery air supply system temperature distribution and reasonable operation.