Research And Optimization Of Intelligent Storage Device For Cold Chain Logistics

With the continuous improvement of the quality of life and consumption of our people,the demand for fresh products has increased year by year,and more attention has been paid to the development of medical and health services,which has put forward higher requirements for cold chain logistics.Nowadays,due to the continuous advancement of technology and the rapid development of e-commerce,cold chain logistics is gradually developing towards standardization,large-scale,and unified directions.As the core link of the cold chain,some difficulties in the development of large-scale development have occurred.The problem that cannot be avoided is that the spatial temperature distribution is uneven,and the cooling capacity in different regions is significantly different.Frequent in and out of the cargo and random placement of the space cause irregular distribution of the space airflow,which leads to chaotic space temperature distribution and is susceptible to cargo changes.Therefore,it is of great significance to find a solution suitable for large-space airflow research.First of all,in order to solve the problems of disordered airflow distribution in conventional large-scale cold storage,strong variability,and difficulty in grasping the distribution rule of temperature changes in large spaces,a storage device with a fixed space ratio was designed.This device can meet the normal cargo storage function while also It can limit the circulation trend of space airflow to the greatest extent.The absence or absence of goods on the shelf is no longer the main factor affecting the uneven distribution of local airflow.Secondly,model the space environment based on the size of the large-scale cold storage,and use the CFD software to simulate and analyze the flow field and temperature field in the model to obtain the numerical situation of each position in the space.The temperature distribution cloud map is compared with the traditional large-scale cold storage.Then,the size of the storage device is further optimized to further improve the overall performance of the cold storage.Considering that even though the storage and movement of goods has now been mechanized and has high flexibility,the storage planning of goods lacks intelligent guidance.Therefore,based on the overall law of spatial airflow distribution,the laws of temperature distribution in various locations in space are explored.Finally,the largescale cold storage is divided into areas with different heat exchange capabilities to provide a basis for the intelligent movement of goods.This study takes the cold storage of a low-temperature logistics company as the research object,designs a cold storage storage device model through Space Claim software,and establishes a physical model with the specific size of the cold storage.At the same time,the fluid mechanics software FLUENT is used to simulate the design of the device.It shows that the storage device with a fixed proportion of space can effectively limit the circulation trend of the space airflow.On the XZ plane of any height,the airflow uniformity is good.The maximum difference of airflow speed in each horizontal direction is 0.8m/s,which is the same.Compared with the traditional cold storage,the maximum speed difference is reduced by 2.21 times;the airflow flows in a relatively fixed pattern.After the rows of goods exchange heat,they converge in the center of the cold storage.After layer-by-layer heat exchange,the gas temperature will increase.High,coupled with the principle of hot air expansion,leads to high temperature areas concentrated in the upper and lower parts of the cold storage,and basically conforms to the normal distribution law,and found in the study that the layout of fixed space proportion is the premise of the normal distribution law;The storage device with a fixed space ratio provides a stable temperature distribution rule for the cold storage,and The relationship between the temperature gradient range,the location of the distribution area,and the number of covered cargoes is provided in this article,which provides theoretical guidance for the intelligent handling of storage devices.Under the model conditions listed in this article,storage devices with a fixed space ratio can make the cold storage The relative heat transfer coefficient reaches 1572W/(㎡·K),which is an increase of 58.5% compared with the traditional cold storage.The size of the storage device is optimized.When the height of the storage box is near 1650 mm,the comprehensive heat transfer coefficient of the cold storage is the highest,reaching 2494.4W/(㎡·K).