State-space model for transient behavior of membrane-based liquid desiccant dehumidifier
State-space model for transient behavior of membrane-based liquid desiccant dehumidifier
复制标题
膜基液体干燥剂除湿器瞬态行为的状态空间模型
DOI：
10.1016/j.ijheatmasstransfer.2019.118711
复制
发表时间：
2019-12
影响因子：
5.2
通讯作者：
Shekhar Divyanshu Kumar
中科院分区：
文献类型：
--
作者：
Li Wei;Yao Ye;Shekhar Divyanshu Kumar
建立了逆流式膜基液体除湿器的状态空间模型，并进行了实验验证。与实验数据相比，模型计算结果的最大相对误差小于2%，平均相对误差约为1%，表明状态空间模型能够较好地预测膜式液体除湿器的瞬态特性。进一步研究了除湿器对入口参数（空气温湿度、空气流量、溶液温度和流量）阶跃变化的瞬态响应。该动态模型能够清晰地反映系统输入、状态和输出变量之间的瞬态关系。结果表明，进口空气温度的扰动对膜式除湿器内湿传递的影响很小，不能忽略;进口空气湿度的变化对膜式除湿器内热传递的影响很小。出口溶液温度对入口扰动的响应时间常数明显大于出口空气温度和湿度对入口扰动的响应时间常数。空气和溶液流量可作为膜式液体除湿器出口空气湿度控制的可控参数。该状态空间模型具有计算时间短、求解过程简单等优点，有助于膜基液体除湿器的控制设计和优化。
In this paper, a state-space model for a membrane-based liquid desiccant dehumidifier with counter-flow configuration was developed and validated experimentally. Compared with experimental data, the maximum relative error of model results is less than 2%, and the mean relative error is about 1%, which indicates that the state-space model can well predict the transient characteristics of the membrane-based liquid desiccant dehumidifier. Further, the transient responses of the dehumidifier to the step changes of inlet parameters (air temperature and humidity, air flow rate, solution temperature and flow rate) were investigated in detail. This dynamic model can clearly reflect the transient relationships among input, state and output variables. It was found that the effect of perturbation of the inlet air temperature on the moisture transfer in the membrane-based dehumidifier was too small to be neglected, and the variation of the inlet air humidity had little effect on the heat transfer. The response time constant of the outlet solution temperature to the inlet perturbations was obviously larger than that of the outlet air temperature and humidity. The air and the solution flow rate can be taken as the controllable parameters for the outlet air humidity control of membrane-based liquid desiccant dehumidifier. With the advantages of short calculation time and simple solving process, the state-space model is helpful for the control design and the optimization of the membrane-based liquid desiccant dehumidifier.
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