Moisture uptake dynamics on desiccant-coated, water-sorbing heat exchanger

作者：Tu, Y. D.; Wang, R. Z.^*; Ge, T. S.

来源：International Journal of Thermal Sciences, 2018, 126: 13-22.

DOI：10.1016/j.ijthermalsci.2017.12.015

• Water-sorbing heat exchanger
• Desiccant coated layer
• Linear driving force model
• Parametric estimation

Recently a novel concept of water-sorbing heat exchanger has been proposed, which can independently handle latent and sensible loads at the same time and provide a very promising high-efficient solution for temperature and humidity control. Obviously, moisture uptake behavior has great influence on heat exchanger's performance. Here, a series of experiments have been made to clarify whether the linear driving force (LDF) model could be used to describe this behavior and to investigate the water uptake mode at different times. Results show that the LDF model is valid for water-sorbing heat exchanger and the moisture uptake experiences four different modes in general, including non-isothermal adsorption, near-isothermal adsorption, capillary condensation and cooling-based condensation. This study also confirms that salts in porous matrix can accelerate moisture uptake and promote capillary condensation. These results in a great improvement of dehumidification capacity. Besides, an empirical and a semi-empirical framework were developed to evaluate the constant parameters in the LDF model. Meanwhile, a figure of merit of the desiccant, Z, was defined for engineering application, to simplify the LDF model in further.

• 出版日期2018-4
• 单位上海交通大学