Abstract
Indoor air pollution control has increasingly focused on addressing the presence of volatile organic compounds (VOCs). In this regard, liquid dehumidification is a potential method for VOC removal. However, most of the recent studies focus on the utilization of conventional liquid desiccants and dehumidifiers without demonstrating their potential in VOC removal. To realize this potential and improve removal efficiency, a proper enhancement strategy is needed. In this paper, a hybrid technology named “surfactant + internal cooling” is proposed to enhance the VOC transfer mechanism. A theoretical model is proposed for predicting VOC transfer employing the hybrid technology presented in this study. The proposed technology is compared against other two conventional technologies in terms of removal performance, parameter distribution, and enhancement mechanism. Additionally, the impacts of some of the key parameters on the VOC removal characteristics when employing the hybrid technology are identified, and their respective distributions are characterized and investigated. The results showed that after the implementation of surfactant technology and internal cooling technology, the improvement rates compared to traditional adiabatic dehumidifiers are 22 % and 42 %, respectively. However, with the hybrid technology combining the surfactant and internal cooling, a maximum improvement rate of 63 % is reported. This enhancement can be attributed to the collaborative reduction of the Henry’s law constant by 62 % at the dual-scale level of micro-solution and macro-structure. Overall, it is demonstrated in this paper that the use of the hybrid technology can simultaneously improve the micro and macro driving forces driving the VOC transfer, enhancing the VOC removal performance. The findings of this study provide new insights to improve the performance of liquid desiccant dehumidifiers in VOC removal applications.
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