Cold Chain Logistics Distribution Center Location And Route Optimization Considering Carbon Emission And Freshness

With the rapid development of storage and preservation technology of fresh products in China,the number of fresh products that need to be transported through cold chain logistics has gradually increased,and the cold chain logistics of fresh products has been developed rapidly.The trading volume of fresh products is steadily increasing and online trading is gradually developing.Therefore,the study of cold chain logistics distribution center site selection and path-related issues is in line with the current research trend.The task of distribution center is mainly responsible for the storage of goods as well as distribution and transportation,it plays a crucial role in the whole logistics system and belongs to the circulation type logistics node,so the geographical location of distribution center is very critical for the layout of the whole cold chain logistics.By combining the advantages of qualitative analysis and quantitative model,this paper establishes a comprehensive site selection model,which is able to calculate the economic benefits as well as assess the qualitative factors.Firstly,the current situation of supply and demand of cold chain logistics is analyzed,and the index system of influencing factors of cold chain logistics distribution center location is established,then the nodes are comprehensively evaluated by grey correlation analysis,and finally the distribution center location is selected by constructing the cold chain logistics distribution center location model,which makes the qualitative evaluation more accurate and reasonable.Fresh food delivery currently has the problem of low satisfaction,and the key to improve service quality is to improve the quality of products.Taking the freshness of fresh products into account when planning the distribution scheme can effectively solve this problem,so the freshness function is considered to be introduced into the model.Not only the transportation cost,construction cost,cargo damage cost,energy consumption,etc.are considered,but also the impact caused by the freshness problem on the economic efficiency of the whole logistics and distribution process is taken into account.By proposing the definition of freshness,the representation of freshness is re-derived according to the previous research to make the model more comprehensive and reasonable.A reasonable distribution route scheme needs to consider not only the economic benefits but also the impact on the social environment,therefore,by adding the carbon emission cost to the total cost,this paper The sources and influencing factors of carbon emissions generated by several different functional elements are analyzed and compared,and the total carbon emission cost is calculated by calculating the cost of fuel consumption and the environmental cost caused by CO2 caused by refrigerated trucks during transportation,and the load estimation method is proposed to calculate the amount of fuel consumption.Taking Y cold chain enterprise in Hunan Province as the actual case,the node demand evaluation was carried out for 100 cities and counties areas in Hunan Province,and the optimal solution of the model was found by immune genetic algorithm for the location selection model of cold chain logistics distribution centers constructed in the paper considering carbon emission and freshness,based on the location selection results,then the distribution path optimization was carried out for 14 stores through two distribution centers in Changsha City,and the optimal path was derived by NSGA-II algorithm,and finally the sensitivity analysis was carried out for the relevant model parameters.