The evaporative cooling technology (ECT) has been regarded as an effective alternative to conventional vapour compression systems due to its energy saving and eco-friendly features. Moreover, when integrating with a solid desiccant unit, ECT can further extend its application in hot and humid environments. This paper proposed and evaluated a solar-assisted solid desiccant Maisotsenko cycle (M−cycle) based indirect evaporative cooling (IEC) system with different recirculation air ratios. Three other cooling systems, including stand-alone Direct Evaporative Cooling (DEC), stand-alone M−cycle IEC, and conventional solid desiccant evaporative cooling system (SD-DEC), were also simulated and compared with the proposed system under various ambient conditions. These systems were assessed in terms of supply air temperature, indoor relative humidity ratio, water consumption rate, coefficient of performance (COP) and solar fraction in this study. A case study of the proposed system was carried out under two typical Australian climates, Darwin and Melbourne. The results indicated that the solar-assisted solid desiccant cooling system integrated with M−cycle IEC had the best cooling performance compared with the other three systems, particularly in hot and humid areas. When increasing the recirculation air ratios from 0% to 60%, a maximum reduction of 23.1% and 41.9% could be observed in the system’s supply air temperature and humidity ratio, respectively. The highest COP was 0.89 when the inlet air temperature was 30 °C, and the COP value would vary as the inlet air temperature and humidity ratio increased. However, a higher water consumption rate was also observed, 31.36% to 57.94% more water would be consumed. This indicates that it requires selecting a proper recirculation air ratio for different climates to achieve the best performance.

蒸发冷却技术（ECT）由于其节能和环保的特点，被认为是传统蒸汽压缩系统的有效替代品。此外，当与固体干燥剂单元集成时，ECT 可以进一步扩展其在炎热和潮湿环境中的应用。本文提出并评估了一种基于太阳能辅助固体干燥剂 Maisotsenko 循环 (M-cycle) 的间接蒸发冷却 (IEC) 系统，具有不同的再循环空气比。还模拟了其他三个冷却系统，包括独立的直接蒸发冷却 (DEC)、独立的 M 循环 IEC 和传统的固体干燥剂蒸发冷却系统 (SD-DEC)，并在各种环境条件下与建议的系统进行了比较. 这些系统根据送风温度、室内相对湿度比、本研究中的耗水率、性能系数 (COP) 和太阳能分数。在两个典型的澳大利亚气候，达尔文和墨尔本，对拟议系统进行了案例研究。结果表明，与其他三种系统相比，集成M循环IEC的太阳能辅助固体干燥剂冷却系统具有最佳的冷却性能，尤其是在炎热和潮湿的地区。当再循环空气比从 0% 增加到 60% 时，系统的送风温度和湿度比分别最大降低了 23.1% 和 41.9%。进风温度为30 ℃时COP最高为0.89，随着进风温湿度比的增加COP值会发生变化。然而，也观察到更高的耗水率，从 31.36% 到 57。将多消耗 94% 的水。这表明它需要针对不同的气候选择合适的再循环空气比以达到最佳性能。