Abstract
The indirect Evaporative Cooler (IEC) utilizes exhaust air from air-conditioned spaces to precondition outdoor air, offering a low-carbon and efficient solution for cooling the air and expanding its application scope. This study developed a mathematical model of IEC, considering the effects of primary air condensation and channel wettability. The correlations of eight parameters on evaluation indexes were analyzed to rank their influence for IEC, revealing that outdoor climate, indoor air conditions, geometric shape, and channel wettability are the main factors affecting cooling efficiency and energy recovery capacity. Subsequently, a comparison of the temperature and humidity distribution inside the IEC under high and low wettability showed that under high-wettability, the cooling effect of the IEC for primary air increased by 23.7 %, and the dehumidification capacity improved by 52.9 %. The performance study of the IEC across seven geographical regions in China indicates that cities with a wet-bulb efficiency greater than 45 % are predominantly located in Northwest China and North China. East China, Central China, and South China exhibit significantly higher average condensation coefficients and cooling capacities compared to other areas, with values of 2.36, 2.26, and 2.56 for the condensation coefficients, and 14.2 kW, 14.7 kW, and 14.9 kW for the cooling capacities, respectively.
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