Energy, entransy and exergy analyses of a liquid desiccant regenerator
Energy, entransy and exergy analyses of a liquid desiccant regenerator
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DOI：
10.1016/j.ijrefrig.2018.08.016
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发表时间：
2019-09
影响因子：
3.9
通讯作者：
B. K. Naik;P. Muthukumar
中科院分区：
文献类型：
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作者：
B. K. Naik;P. Muthukumar
本文分析了液体干燥剂与环境空气之间的能量交换、传热传质耦合过程中的能量耗散以及液体干燥剂再生器相对于参考状态的能耗。推导了再生器的能量、火用能和能量（EEE）的表达式，并沿液体干燥剂再生器的高度进行了量化。通过改变干燥剂温度和浓度、空气温度和湿度比以及空气和干燥剂流量等操作参数，从能量、火用和脱附效率等方面研究了再生器的性能。从EEE分析可以看出，将干燥剂温度从60.3℃提高到65.2℃，同时将空气湿度比从18.7 gwv/ kgdaa降低到14.3 gwv/ kgdaa，整体能量交换、火用破坏和能量耗散分别提高26%、37%和39%。进一步研究了沿塔高方向的熵产，观察到在给定的运行条件下，随着塔高方向距离的增加，空气侧和溶液侧的熵产分别增加96%和减少35%。
In the present study, the energy exchange between the liquid desiccant and the ambient air, entransy dissipation during coupled heat and mass transfer processes and exergy destruction with respect to the reference state for the liquid desiccant regenerator are analyzed. Expressions for energy, exergy and entransy (EEE) of the regenerator are derived and also quantified along the height of the liquid desiccant regenerator. By varying the operating parameters such as desiccant temperature and concentration, air temperature and humidity ratio and air and desiccant flow rates, the performance of the regenerator is investigated in terms of entransy, exergy and desorption efficiencies. From the EEE analyses, it is observed that by increasing the desiccant temperature from 60.3°C to 65.2°C and decreasing the air humidity ratio from 18.7 gwv/kgdato 14.3 gwv/kgdasimultaneously, the overall energy exchange, exergy destruction and entransy dissipation are increased by 26%, 37% and 39%, respectively. Further, the entropy generation along the tower height is also investigated and observed that for a given set of operating conditions, with increase in distance along the tower height, the entropy generation increases by 96% and decreases by 35% for the air side and the solution side, respectively.