Volume 29: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part IV

Comparison study of the pre-cooled and internally cooled liquid desiccant systems with different working fluids Xiaosong cheng, Thomas Meyer, Cristina Ricart, Meinard Gimm, Felix Ziegler, Yonggao Yin

Abstract

In this paper, a simulation is carried out on a precooled liquid desiccant system working with aqueous Lithium Chloride (LiCl). The effects of different ambient air humidity on the outlet air humidities of absorber and desorber, crystallization of LiCl, cooling capacity, and COP of the system are analyzed. Besides, the system is compared to experimental results of an internally cooled liquid desiccant system using a new ionic liquid which is referred to as IL9. The conditions for both, the experiment as well as for the simulation are the same in terms of heat and mass transfer area, air inlet parameters, heat exchanger effectiveness, and hot and cooling water temperature. Some conclusions are summarized, for instance, the system using LiCl should be driven by the hot water of no more than 80℃ to avoid the crystallization risk, and the internally cooled system using IL9 shows a higher dehumidification performance than the pre-cooled system using LiCl especially at increased inlet air humidities.

Keywords Pre-cooled liquid desiccant system, internally cooled, lithium chloride, ionic liquid, crystallization, dehumidification