Development And Performance Study Of Solar Semiconductor Refrigeration Unit For Refrigerated Vehicles

With the rapid consumption of energy and environmental degradation,solar energy,a clean and green energy is gradually entering the life of the general public.Semiconductor refrigeration is a kind of refrigeration method that relies on electrical energy to produce cold,which has various advantages such as clean and environmental protection,small thermal inertia,flexible application scenarios,etc.It has been widely used in many fields such as military,medical and aerospace,and the frequency of its appearance in daily life is increasing day by day.This paper designs and develops a solar-powered semiconductor refrigeration device applied to a small refrigerated vehicle,which provides electrical energy through solar photovoltaic panels arranged on the outer surface of the vehicle,especially suitable for short-distance distribution of fruits and vegetables in urban areas,and this study has certain reference significance for promoting the application of semiconductor refrigeration to transportation vehicles.First,this paper provides a comprehensive analysis of the research related to solar semiconductor refrigeration devices for small refrigerated vehicles.After discussing the research process and current status of solar photovoltaic power generation,semiconductor refrigeration technology and the existing refrigeration technology commonly used in refrigerated vehicles,theoretical studies are conducted on the maximum refrigeration capacity working condition,maximum refrigeration coefficient working condition and optimal working condition in the practical application of semiconductor refrigeration,and the optimal current value suitable for the solar semiconductor refrigeration device for small refrigerated vehicles can be calculated by the formula.Secondly,the development of solar semiconductor refrigerated vehicle is carried out,the calculation of solar angle and solar radiation is done,and on this basis,the drawing of voltammetric characteristic curve and the actual output power measurement experiment of the battery panel are carried out to determine the actual output power of the solar battery panel.The heat load calculation of the refrigerated truck is carried out,and the selection of each component of the device is made according to the heat load,and the optimal heat dissipation method at the hot end applicable to this design is determined.The four heat dissipation methods of natural convection heat dissipation,forced ventilation heat dissipation,water cooling heat dissipation and heat pipe heat dissipation are designed and experimented respectively,in which the current value of the input refrigeration module is changed,the temperature of the hot and cold ends are measured respectively,and then the experimental data are analyzed by software regression to obtain the current value that makes the heat dissipation method in the optimal working condition.According to the experimental results,the best hot-end cooling method is selected to determine the optimal operating current of the refrigeration module.Based on the above series of experiments and the selection of accessories,the structural design of the refrigerated compartment is carried out.Then numerical simulation of flow and heat transfer is performed for the flow field of the refrigerated compartment and the flow field around the hot end fins of the refrigeration unit.The temperature field inside the refrigerated compartment is simulated and studied by changing the distribution position of the cooling fins on the top of the compartment,and the installation position of the cooling fins with uniform flow field distribution is sought.Then,the relationship between the size of the hot end fins and heat dissipation is studied to determine the fin size with the best heat dissipation effect.Based on the above simulation results,the optimal cooling fin installation location and the best fin parameters are determined,and the fins are processed and installed on the hot end of the experimental bench according to the simulation results to improve the heat dissipation efficiency and optimize the performance of the solar semiconductor cooling device for refrigerated vehicles.Finally,the performance experiments of cooling and heating conditions are carried out on the experimental bench of the solar semiconductor refrigeration device,and the experimental results are compared with the simulation results to find out the problems in the experiments and improve the design to obtain the solar semiconductor refrigeration device for small refrigerated vehicles.