Simulation And Experimental Research On Cold Storage Performance Of Beverage Vending Machine

At present,a convenient,flexible,and intelligent beverage vending machine is becoming more and more common in life.This kind of beverage vending machine instantly increases user demand,and when the cold drink needs to be continuously discharged,the temperature of the cold drink will exceed the limit value.In order to overcome this problem,this research explores the use of cold storage methods to solve the above problems and develops a new type of cold storage device.The research and development of a new type of cold storage device must go through the two stages of system design and performance verification.How to optimize some components of the cold storage device and the entire cold storage system is a subject of great research significance.The main work and research conclusions of this paper are as follows:(1)Refer to domestic and foreign materials,understand the development history and research status of beverage vending machines and their cold storage devices,and understand the necessary theoretical basis for cold storage.From the perspective of food safety,to prevent the leakage of phase change materials,the penetration of stainless steel will affect the water in the stainless steel and cause pollution.In this study,aluminum block was selected as the cold storage material.Aluminum has the advantages of large thermal conductivity,low subcooling,large cold storage capacity,and excellent performance.(2)According to the requirements of the cooperative unit and the market demand,solve the problem that the current beverage vending machine continuously increases the temperature of the cup,and the cold storage capacity is not strong,which cannot meet the instantaneous large quantity.The aluminum block-filled cold storage is combined with the spiral tube evaporator.The spiral tube has a compact structure,a large heat transfer area,and a small temperature difference stress.A small cold storage device suitable for beverage vending machines is designed and its feasibility is studied.(3)Perform numerical simulation on the cold storage process,use Solid Works three-dimensional software to establish a physical model of the cold storage evaporator,use Mesh for meshing,set import and export conditions,and use Fluent software to set the model,material,and boundary conditions for the heat transfer process,and explore The change law and mutual influence of the aluminum block,the water temperature in the pipe and the temperature of the outlet water in the energy storage device.(4)Through the numerical simulation of the heat exchanger of the cold storage device,the temperature distribution of the aluminum block in the cold storage spiral tube evaporator,the temperature of the water inlet and outlet,and the temperature distribution of the energy storage heat exchanger are simulated and studied.Analyzing the simulation results,the final water pipe outlet temperature obtained by the simulation is 2℃,which meets the requirement of normal outlet ideal temperature below 15℃ and the effect is good.The feasibility of the designed system is obtained,the appropriate compressor and other refrigeration system components are selected,and the design is It is applied to the cold storage experimental device of the beverage vending machine.(5)Set up an experimental platform for experimental research,and determine the size and model of each equipment and other related parameters.The initial conditions and requirements of the control simulation and the experiment are consistent,and then the two results are compared,the reliability and rationality of the numerical simulation results are obtained,the data differences and the changing laws are summarized,and the reasons leading to the differences are analyzed.Finally,the compressor stops working when the outlet temperature reaches 2℃,and the water is discharged until the outlet temperature rises to 15℃.The simulation result is 104%higher than the existing machine’s water output,and the experimental result is more than the existing machine’s water output.87.5%.The results show that the established mathematical model is reasonable and meets the needs of production practice.At the same time,it also verifies that the heat exchange effect of the physical heat exchanger corresponding to the established model achieves the expected effect,and realizes the improvement of beverage production under the condition of low energy consumption.Adjust the machine to continuously supply and maintain the target of beverage temperature.