Simultaneous heat and moisture transfer through a composite supported liquid membrane |
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| Authors: | Li-Zhi Zhang Fu Xiao |
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| Affiliation: | 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China;2. Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. OAO “INSOLAR-INVEST”, Moscow, Russia;2. Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Moscow 119991, Russia;3. Moscow Architectural Institute (State Academy), Moscow, Russia;1. Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Hong Kong;2. Renewable Energy Research Group (RERG), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;3. State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, China;4. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, China;1. Department of Architecture and Built Environment, University of Nottingham, University Park, NG7 2JQ Nottingham, United Kingdom;2. Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, TRNC Mersin 10, Turkey;3. Department of Energy, Forest and Built Environments, Dalarna University, Falun, Sweden;4. Department of Energy and Power Engineering, University of Shanghai for Science and Technology, Jungong Road No. 516, Shanghai 200031, China;1. Faculty of Engineering, Amol University of Special Modern Technologies, Amol, Iran;2. Department of Mechanical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran |
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| Abstract: | Composite supported liquid membranes (SLM) are an efficient transfer media to recover heat and moisture from exhaust air due to the high moisture diffusivity in the liquid layer. However, heat transfer has adverse effects on moisture transfer since the water concentration in the LiCl solution decreases at higher temperatures. This study gives a detailed quantitative analysis of these effects. More specifically, simultaneous heat and moisture transfer through a composite supported liquid membrane is modeled. The SLM involved comprises three layers: two hydrophobic porous skin layers and a hydrophilic porous support layer where a layer of LiCl liquid solution is immobilized in the macro and micro pores as the permselective substance. The equations governing the heat mass transport in the microstructures, as well as the transfer of heat and moisture in the air streams adjacent to the membrane, are solved numerically in a coupled way. An experiment has been built to validate the model. The results found that though heat transfer has adverse effects on moisture transfer, in general, the effects on moisture effectiveness are quite limited. The high moisture permeation rates of SLM can be sustained when there is concomitant simultaneous heat transfer. |
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