Performance analysis of an internally-cooled plate membrane liquid desiccant dehumidifier (IMLDD): An analytical solution approach
Performance analysis of an internally-cooled plate membrane liquid desiccant dehumidifier (IMLDD): An analytical solution approach
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DOI：
10.1016/j.ijheatmasstransfer.2017.11.126
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发表时间：
2018-04
影响因子：
5.2
通讯作者：
Simin Huang;Min-lin Yang;B. Hu;Shi Tao;F. Qin;Wanliang Weng;Wenhao Wang;Liu Jian
中科院分区：
文献类型：
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作者：
Simin Huang;Min-lin Yang;B. Hu;Shi Tao;F. Qin;Wanliang Weng;Wenhao Wang;Liu Jian
采用内冷式平行板膜式液体干燥剂除湿机（IMLDD）进行空气除湿，并在溶液通道内设置冷却管。其概念类似于包含加工空气、液体干燥剂和制冷剂流的三流体热交换器。加工空气和液体干燥剂流在相邻的通道中流动，这些通道由板膜形成。在每个溶液通道中安装一排冷却管，通过吸收从处理空气中穿过膜转移到溶液中的水蒸气来带走溶液中产生的吸收热。在包含空气通道、板膜、溶液通道和一排冷却管的单元格中建立了集总参数模型，研究了IMLDD内部的传热和质量传递。根据具有特定物理意义的无量纲参数，得到了归一化控制方程的解析解。然后计算显冷效率、除湿效率、除湿速率、气流的能量传输率以及水流的显热传输率与气流的能量传输率之比。仅采用以往研究的少量进水温度和显热容比运行条件来验证模型。然而，未来将在更多的操作条件下进行更多的验证。可以发现，降低进水温度，使溶液温度始终保持在一个相对较小的水平，大大提高了IMLDD的性能。进水温度建议设置为20℃左右 ℃，略低于溶液入口温度。
An internally-cooled parallel-plate membrane-based liquid desiccant dehumidifier (IMLDD) with cooling tubes inside the solution channels has been used for air dehumidification. The concept is similar to a three-fluid heat and mass exchanger containing processing air, liquid desiccant, and refrigerant streams. The processing air and the liquid desiccant streams flow in the neighboring channels, which are formed by the plate membranes. A row of the cooling tubes are installed in each solution channel to take away the absorption heat generated in the solution by absorbing the water vapor transferred from the processing air across the membranes into the solution. A lumped parameter model is established in a unit cell containing an air channel, a plate membrane, a solution channel, and a row of the cooling tubes, to study the heat and mass transports in the IMLDD. An analytical solution of the normalized governing equations is obtained based on the dimensionless parameters, which have their specific physical meanings. Sensible cooling effectiveness, dehumidification effectiveness, dehumidification rate, energy transfer rate of the air stream, and the ratio of the sensible heat transfer rate of the water stream to the energy transfer rate of the air stream are then calculated. Only a few operating conditions of inlet water temperatures and sensible heat capacity ratios from previous studies have been employed to validate the model. However more validations would be conducted in future under more operating conditions. It can be found that the performances of the IMLDD are largely improved when the water inlet temperature is decreased to keep the solution temperature always in a relatively small level. The water inlet temperature is recommended to be set as about 20 °C, which is somewhat smaller than the solution inlet temperature.