To improve the ventilation and air-conditioning energy efficiency of buildings in hot and dry climates, this paper proposed and experimentally investigated an indirect flash evaporative cooling (IFEC) technology combining plate heat exchanger with ultrasonic atomizer. Compared with traditional indirect evaporative cooling (IEC) technology, working air is humidified to be over-saturated by ultrasonic atomizer in the IFEC technology which enhances water evaporation efficiency and reduces thermal resistance between working air/water and product air. The prototype and experimental setup units of the IFEC were developed to investigate its wet-bulb effectiveness, dry-bulb effectiveness, cooling capacity and thermal resistance under hot/dry and warm/dry climates. Results show the IFEC prototype could supply product air with temperatures of 3–7 °C lower than indoor air, which indicated the IFEC could not only fulfill the incoming outdoor air cooling load, but also provide additional cooling capacity for indoor environment. The wet-bulb effectiveness and dry-bulb effectiveness were measured to be 0.80–0.92, 117%–254% respectively. The wet-bulb effectiveness is higher than existing single stage IEC technology. Sensitivity analysis show the outlet product air temperature is dominantly affected by working air humidity ratio, and the cooling capacity is affected by both working air humidity ratio and airflow rates.

为了提高炎热干燥气候下建筑物的通风和空调能效，本文提出并通过实验研究了板式换热器与超声雾化器相结合的间接闪蒸蒸发冷却（IFEC）技术。与传统的间接蒸发冷却（IEC）技术相比，IFEC技术中的超声雾化器将工作空气加湿至过饱和状态，从而提高了水蒸发效率并降低了工作空气/水与产品空气之间的热阻。开发了IFEC的原型和实验设置单元，以研究其在热/干燥和暖/干燥气候下的湿球有效性，干球有效性，冷却能力和热阻。结果表明，IFEC原型可以提供比室内空气低3–7°C的产品空气，这表明IFEC不仅可以满足传入的室外空气冷却负荷，还可以为室内环境提供额外的冷却能力。测得的湿球有效性和干球有效性分别为0.80-0.92、117％-254％。湿球效率高于现有的单级IEC技术。敏感性分析表明，出口产品的空气温度主要受工作空气湿度比的影响，而制冷量受工作空气湿度比和气流率的影响。测得的湿球有效性和干球有效性分别为0.80-0.92、117％-254％。湿球效率高于现有的单级IEC技术。敏感性分析表明，出口产品的空气温度主要受工作空气湿度比的影响，而制冷量受工作空气湿度比和气流率的影响。测得的湿球有效性和干球有效性分别为0.80-0.92、117％-254％。湿球效率高于现有的单级IEC技术。敏感性分析表明，出口产品的空气温度主要受工作空气湿度比的影响，而制冷量受工作空气湿度比和气流率的影响。