人类在自然界中观察到了蒸发冷却，并即兴将其应用于多种应用。直接和间接蒸发冷却选项已被广泛使用，直接选项（沙漠冷却器和空气清洗器形式）更常见。蒸发式通风系统通常具有更高的蒸发冷却速率；因此，这些都是在一个扩展的舒适区使用。但其使用仍然受到环境湿球温度和湿球沉降的限制。可以通过多阶段来增加其适用范围，这大大提高了系统的性能。 多稳态的一种选择称为再生冷却，它通过直接和间接蒸发冷却与部分工艺空气的再循环相结合来实现。在这个方案中，理论上可以实现空气的露点温度，它可以大大低于空气的湿球温度。蓄热式蒸发冷却器的性能已在广泛的室外条件下进行了研究。获得了0.7–1.1范围内的典型总体有效性值，平均值为0.86，标准偏差为0.134。本文探讨了这种冷却器为印度许多城市提供舒适环境的潜力。 单位:SICitation:ASHRAE Transactions，第114卷，pt。2、盐湖城2008

Man has observed evaporative cooling in nature and improvised it to suit a large variety of applications. Direct and indirect evaporative cooling options have been extensively used, with the direct option (in the form of desert coolers and air washers) being more common. Evaporative cooling systems typically have much higher circulation and ventilation rates; thus, these are used over an extended comfort zone. But its use is still limited by the ambient wet-bulb temperature and wet-bulb depression. It is possible to increase its range of applicability by multi-staging, which improves the performance of the system substantially. One of the options of multistaging is termed regenerative cooling, which is achieved by a combination of direct and indirect evaporative cooling with recirculation of part of the process air. In this scheme, it is theoretically possible to achieve the dew-point temperature of air, which can be substantially below the wet-bulb temperature of air. The performance of a regenerative evaporative cooler has been studied over a wide range of outdoor conditions. Typical overall effectiveness values in the range of 0.7–1.1, with a mean of 0.86 and standard deviation 0.134, have been obtained. The potential of such a cooler to provide comfort for many cities in India has been explored in the paper.Units: SI