Synergy of three fields inside refrigerated transportation carriages on highways

Based on the coordinated control of temperature and velocity fields inside refrigerated transportation carriages on highways, starting from the energy conservation synergy equation and turbulent kinetic energy equation, the air parameters of heat transfer working fluid are set to explore the synergy of velocity and pressure fields. For the purpose of evaluating temperature uniformity, this study qualitatively verifies the simulation and diffusion of three fields along the longitudinal section inside the refrigerated compartment, and divides the heat transfer and low resistance performance of the uniform flow plate with circular holes, elliptical holes, and regular hexagonal holes into numerical simulation comparisons and analyses. After the intake duct of the refrigerated compartment is equipped with an elliptical hole intake baffle, the maximum temperature that deviates along the width of the compartment during the full load process decreases from 2.53 ℃ to 1.27 ℃, and the temperature scale difference decreases from 0.642 ℃ to 0.332 ℃. The effect explains that the flow resistance of the inlet duct is relatively small, which effectively reduces the pump power consumption of the refrigeration unit. The temperature diffusion is stable and even, and there is good synergy among the rate field, temperature gradient field, and pressure gradient field.

The cooling capacity generated by the refrigeration unit of the road refrigerated transport vehicle is rotated by the axial flow fan, forming a circulating flow along the intake duct, interior of the compartment, and return air duct from the front to the rear of the vehicle. The parameters of cooling rate and pressure generally decrease from the front to the rear of the vehicle, while the density tends to settle from top to bottom. By analyzing the effect of the single uniform flow plate structure on heat transfer and flow resistance in the inlet duct, the comprehensive performance of the inlet duct plate side can be accurately shaped to a certain extent. In the process of refrigerated transportation, adopting an inlet with average heat transfer enhancement and high efficiency and low resistance, analyzing and comparing the airflow orifice plate structure with practical application value, can effectively reduce energy consumption from an engineering perspective, save transportation costs per unit mileage, and improve the economic efficiency of refrigerated vehicles.

The comparative analysis and interpretation of the simulated values and actual measurement values of the three measurement points inside the refrigerated compartment show that the mathematical model established can accurately characterize the diffuse characteristics of the three fields from a qualitative perspective, but its accuracy cannot meet the requirements of quantitative and accurate research. The reason for this is that there are limitations in the flow area inside the chamber of the mold, flow rate, heat exchange rate, boundary conditions, and the time for cooling to remain in the chamber, which pose verification difficulties; If we consider improving the multidimensional and unstable solidification of the model, although it can improve computational accuracy, it will greatly increase computational workload and numerical analysis time; The model is established under relatively reliable boundary conditions and stable fluidity assumptions, however, the heat transfer coefficient of Yangmei undergoes certain changes with the external environment and its own thermal exchange.

The three diffusion states inside the refrigerated compartment are huge. Although the power and wind speed of the refrigeration unit are constant and simulated under ideal steady-state conditions, there are still some differences from the actual state inside the compartment. In addition, the fluid element surface has three-dimensional and turbulent characteristics, which makes it difficult to directly accept longitudinal and transverse section comparative analysis. This article aims to evaluate the temperature distribution that directly affects the balance of taste and quality of Yangmei during refrigerated transportation. Within the storage space of Yangmei, the temperature at a distance of 10mm from the center of 21 uniform flow plates is selected for comparative analysis.