An improved design of the refrigeration unit that provides enhanced airflow distribution inside the refrigerated container is proposed by numerically analyzing the airflow patterns in the refrigerated container with several design models of the refrigeration unit. Fifteen different models have been considered by changing effective dimensions and design parameters of the refrigeration unit, which play a major role in affecting the airflow patterns inside the refrigerated container. The numerical simulation of the airflow inside the refrigerated container is performed by considering the pressure drop and flow characteristics in the refrigeration unit. The pressure drop in the refrigeration unit is obtained by modeling the evaporator coil of the refrigeration unit as a porous medium. Results show that the improved design of the refrigeration unit provides significantly higher jet velocity, higher vertical velocity distributions, improved Coanda effect, higher mass averaged velocity, and reduced areas of dead zones in the container compared to the base case refrigeration unit. The mass averaged velocity in the refrigerated container with the improved refrigeration unit is 33.66% higher than that of the base case refrigerated container.

通过用几种制冷单元的设计模型对制冷容器中的气流模式进行数值分析，提出了一种改进的制冷单元设计，该制冷单元在制冷容器内部提供了增强的气流分配。通过改变制冷单元的有效尺寸和设计参数，已经考虑了15种不同的模型，它们在影响冷藏集装箱内部的气流模式中起着重要作用。考虑到制冷装置中的压降和流动特性，对冷藏容器内部的气流进行了数值模拟。通过将制冷单元的蒸发器盘管建模为多孔介质，可以获得制冷单元中的压降。结果表明，与基本案例制冷单元相比，制冷单元的改进设计可提供更高的喷射速度，更高的垂直速度分布，改善的柯恩达效应，更高的质量平均速度以及减少容器中的死区。具有改进的制冷单元的冷藏容器中的质量平均速度比基本情况的冷藏容器高33.66％。