Experimental comparative research on electrodialysis regeneration for liquid desiccant with different concentrations in liquid desiccant air-conditioning system

Abstract

The issue of energy and environment is increasingly prominent, and air-conditioning system costs a lot of energy in the building. The liquid desiccant air-conditioning system is a novel air-conditioner with good energy saving potential, whose energy consumption mainly relies on the regeneration process of liquid desiccant. In this paper, an experimental system of electrodialysis (ED) regenerator was set up to confirm the stability of the ED regenerator for the regeneration of liquid desiccant with different concentrations and the regeneration performance of the ED regenerator for liquid desiccant with different concentrations was investigated. Moreover, the ideal COP of the liquid desiccant air-conditioning system and vapor pressure of the acquired strong desiccant at the exit of the ED regenerator were also evaluated to compare the characteristic of the ED regenerator for liquid desiccant with different concentrations. The result shows that besides high concentration, the low temperature is also very important for liquid desiccant to have high dehumidification capacity. Moreover, the excessive increase of current will be more harmful to the dehumidification capacity of the acquired strong liquid desiccant when liquid desiccant concentration is around 35%. Furthermore, when liquid desiccant concentration is around 35%, the ED regenerator needs more power to achieve liquid desiccant with the same dehumidification capacity.