Coupled heat and mass transfer in a counter flow hollow fiber membrane module for air humidification |
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| Authors: | Li-Zhi Zhang Si-Min Huang |
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| Affiliation: | 1. Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-Ro, Mapo-Gu, Seoul 121-791, South Korea;2. Department of Mechanical Engineering, The University of Michigan-Dearborn, 4901 Evergreen Road, Dearborn, MI 48128, USA;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;1. National University of Singapore, Department of Mechanical Engineering, 9 Engineering Drive 1, Singapore, 117576, Singapore;2. Department of Solar Energy and Environmental Physics, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 84990, Israel;3. Water Desalination & Reuse Centre, King Abdullah University of Science & Technology, Thuwal, Saudi Arabia |
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| Abstract: | Hollow fiber membrane based air humidification offers great advantages over the traditional methods because the liquid water droplets are prevented from mixing with the process air, while water vapor can permeate through the membranes effectively. The novelty in this research is that the coupled heat and moisture transport in a hollow fiber membrane module for air humidification is investigated, both numerically and experimentally. The air stream and the water stream flow in a counter flow arrangement. It is found that the membranes play a key role in humidification performances. For sensible heat transfer, both the liquid side and the membrane side resistance can be neglected, while the total heat transfer coefficients are determined by the air side heat transfer coefficients. In contrast, in mass transfer, only the liquid side resistance can be neglected, while the total mass transfer coefficients are co-determined by membrane properties and the air side convective mass transfer coefficients. |
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