Abstract
Electrodialysis is regarded as a novel liquid regeneration method, and the regenerated solution can satisfy the dehumidification requirements even in a hot and humid environment. LiBr solution is an important choice for a liquid desiccant air conditioning system due to its great dehumidifying ability, so it is necessary to conduct experimental exploration of the regeneration characteristics of ED regeneration for LiBr solution. In this paper, the effects of solution concentration, circulation flow rate, current and electrode solution on the performance of the electrodialysis regeneration system were studied by constructing an experimental electrodialysis regeneration system. The results show that growing the starting concentration of the LiBr solution adversely affects the regeneration characteristics of the electrodialyzer and of the air conditioning system dehumidified by the solution. Under test conditions, as the initial concentration of LiBr solution increased from 45% to 55%, the performance coefficient (COP) of the system decreased from 2.12 to 1.05. When the dehumidification requirement is met, the initial concentration of the LiBr solution should be reduced. Increasing the circulating flow rate can improve the regeneration performance of the electrodialyzer and the capability of the air conditioning system dehumidified by the solution, but excessively increasing the circulating flow rate will decrease the regeneration performance of the electrodialyzer and the performance of the air conditioning system dehumidified by the solution. Increasing the current can increase the concentration of the LiBr solution in the regeneration cells in a short time, but it will reduce the regeneration performance of the electrodialyzer and the characteristic of the air conditioning system dehumidified by the solution. The current needs to be minimized when meeting regeneration requirements. With the growth in the flow rate of the electrode solution, the regeneration performance of the electrodialyser decreases continuously.
Highlights
Due to high energy loss of buildings’ air conditioning systems, improving the energy efficiency of buildings plays a vital role in reducing global energy use
This paper focuses on studying the effects of LiBr solution concentration, flow rate, current, and electrode solution on the regeneration characteristic of the electrodialyzer to regenerate lithium bromide solution and to analyze the regeneration performance of the electrodialysis regeneration system for LiBr solution based on the experimental data
This is due to the increase in the initial concentration, which continuously increases the viscosity of the lithium bromide solution, which leads to a decrease in the regeneration performance of the electrodialysis regenerator
Summary
Due to high energy loss of buildings’ air conditioning systems, improving the energy efficiency of buildings plays a vital role in reducing global energy use. Liquid desiccant dehumidification technology has received widespread attention due to its high energy saving potential [3,4], and this technology has been practically applied in the air dehumidification of buildings. When the outside environment is hot and humid, the desiccant solution needs more heat energy and higher temperature in order to be regenerated, and the hot desiccant solution after heat regeneration needs to be cooled before it can work to meet the dehumidification requirement. This shortage limits the widespread application of liquid desiccant air conditioning systems utilizing the thermal regeneration method
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