In the present paper, the mid-term performance of two different architectures of a solar-driven jet-ejector refrigeration system is numerically compared: the first one is fitted with a fixed-geometry jet-ejector while the second one is equipped with an adjustable spindle that modifies the jet-ejector area ratio. The jet-ejector behavior has been predicted with a validated computational fluid dynamics approach and the dynamic response of the overall system accounts for transient effects in a small parabolic trough collector and a hot thermal storage tank. The investigation shows that the adjustable jet-ejector allows for continuous and smooth operation in a much wider range of outdoor conditions. Additionally, it enables more efficient management of the thermal level in the hot storage system. As a result, the adjustable refrigeration system improves the performance indicators in all the warm months of the typical meteorological year under evaluation. The maximum improvement potential is found in May; the fixed-geometry system provides an average $CO{P}_{\text{th}}$of 0.34 while the adjustable system reaches an average $CO{P}_{\text{th}}$of 0.48 considering the same boundary conditions in both cases.

在本文中，通过数值比较了太阳能驱动喷射器制冷系统的两种不同体系结构的中期性能：第一种安装有固定几何形状的喷射器，而第二种则装有可调式喷射器修改喷射器面积比的主轴。喷射器的行为已通过一种经过验证的计算流体动力学方法进行了预测，整个系统的动态响应说明了小型抛物槽式集热器和热储罐中的瞬态效应。调查表明，可调式喷射器可在更广泛的室外条件下连续且平稳地运行。此外，它还可以更有效地管理热存储系统中的热量水平。结果是，在评估的典型气象年的所有温暖月份，可调式制冷系统都会改善性能指标。最大的改进潜力是在五月份。固定几何系统提供平均值$CØP_{\text{日}}$可调系统达到平均值的0.34 $CØP_{\text{日}}$在两种情况下，如果考虑相同的边界条件，则为0.48。