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Mass transfer performance comparison of two commonly used liquid desiccants:LiBr and LiCl aqueous solutions

机译：两种常用液体干燥剂：LiBr和LiCl水溶液的传质性能比较

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摘要

Mass transfer performance of two commonly used liquid desiccants, LiBr aqueous solution and LiCl aqueous solution, is compared in this paper on the basis of the same solution temperature and surface vapor pressure. According to the analysis of the analytical solutions of heat and mass transfer processes, the key performance influencing factors are heat capacity ratio of air to desiccant m~* and mass transfer unit NTU_m. The heat capacities of the two liquid desiccants are about the same at same volumetric flow rate, and LiBr solution has higher density and smaller specific heat capacity. The variance of mass transfer unit with different operating conditions and liquid desiccants are derived based on the experimental results. In the condition of the same desiccant mass flow rate, the dehumidifkation performance of LiCl solution is better, and the regeneration performance of LiBr solution is a little better or almost the same as that of LiCl solution. In the condition of the same desiccant volumetric flow rate, the dehumidifkation performance of LiCl solution is a little better or about the same compared with LiBr solution, and the regeneration performance of LiBr solution is better. The COPs of the liquid desiccant systems using these two desiccants are similar; while LiCl solution costs 18% lower than LiBr solution at current Chinese price.
机译：本文在相同的溶液温度和表面蒸气压的基础上，比较了两种常用的液体干燥剂LiBr水溶液和LiCl水溶液的传质性能。根据对传热传质过程解析解的分析，影响性能的关键因素是空气与干燥剂的热容比m〜*和传质单元NTU_m。在相同的体积流量下，两种液体干燥剂的热容量大致相同，而LiBr溶液具有较高的密度和较小的比热容。根据实验结果推导了不同工况和液体干燥剂对传质单元的影响。在相同的干燥剂质量流量条件下，LiCl溶液的除湿性能较好，LiBr溶液的再生性能稍好或与LiCl溶液几乎相同。在相同的干燥剂体积流量条件下，LiCl溶液的除湿性能比LiBr溶液稍好或几乎相同，LiBr溶液的再生性能更好。使用这两种干燥剂的液体干燥剂系统的COP相似。以目前的中国价格，LiCl溶液的成本比LiBr溶液低18％。

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