| 摘要: |
| 溶液表面蒸汽压是影响溶液除湿系统的重要参数之一。本文分析除湿溶液蒸汽压形成机理及其在除湿过程中的作用，通过测量不同温度下各种质量配比及各种质量浓度的LiCl-CaCl2二元混合溶液实际表面蒸汽压，并选取两种典型的理论模型(NRTL方程及简单混合模型)，对混合溶液蒸汽压进行计算与拟合，从而验证计算模型。最终认为氯化锂与氯化钙质量比为1:1的混合溶液是比较理想的配比，质量浓度较低时表面蒸汽压可采用简单的混合模型，质量浓度较高时需对两种模型进行修正，从而可估算并预测不同工况的溶液表面蒸汽压，为确定溶液除湿再生系统的方案提供理论基础。 |
| 关键词: 除湿剂 表面蒸汽压 二元混合溶液 NRTL方程 |
| DOI： |
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| Verification and Research on the Vapor Pressure of Mixed LiCl-CaCl2 Solution |
| Zhu Zhengyuan,Yao Ye |
| (School of Mechanical Engineering, Shanghai Jiao Tong University) |
| Abstract: |
| The vapor pressure of desiccant solution is one of the most important parameter of liquid desiccant cooling system. It dominates the performance of this system. This paper selects two typical models—NRTL equation and simple mixed model—to analyze the formation mechanism of the vapor pressure and the role it plays in dehumidification process. The vapor pressure of mixed LiCl-CaCl2 solution is calculated according to these two models. Then the models are verified through measuring the vapor pressure of various mixture ratios and various mass concentrations of the mixed solution under different temperatures. Finally the research considers the mixed solution of 50% LiCl and 50% CaCl2 as the best mixture ratio. Simple mixed model can be adopted when the solution is at low mass concentration while the models should be amended to conform to the actual situations when the solution is at high mass concentration. The modified model is able to make an estimation or prediction on vapor pressure under different conditions which offers a theoretical basis to determine the mixed liquid desiccants in the design of liquid desiccant cooling system. |
| Key words: liquid desiccant vapor pressure binary mixed solution NRTL equation |
