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Hollow Fiber Membrane Dehumidification Device for Air Conditioning System
Baiwang Zhao1, Na Peng2, Canzeng Liang3
1Department of Chemical & Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore. chezhba@nus.edu.sg.
Membranes
|November 19, 2015
Summary
Membrane air dehumidification offers energy savings up to 26.2% for tropical climates. This novel approach avoids phase transitions and cross-contamination, unlike traditional methods.
Area of Science:
- Environmental Engineering
- Materials Science
- Chemical Engineering
Background:
- Indoor comfort in tropical regions necessitates air cooling and dehumidification.
- Traditional methods like direct cooling and desiccation have limitations including energy inefficiency and cross-contamination.
- Membrane separation presents an emerging, efficient alternative for air dehumidification.
Purpose of the Study:
- To evaluate the performance of a pilot-scale membrane air dehumidification system.
- To assess the energy efficiency and effectiveness of membrane dehumidification compared to conventional methods.
- To demonstrate the feasibility of using PAN/PDMS hollow fiber membranes for air dehumidification.
Main Methods:
- A pilot-scale system utilizing nine 1-inch PAN/PDMS hollow fiber membrane modules was constructed.
- A 150-hour long-term test was conducted under specific operating conditions.
- Low vacuum force (0.78 bar absolute pressure) was applied to the lumen side of the membrane modules.
Main Results:
- The membrane modules exhibited favorable water vapor transport properties.
- Feed humid air experienced a significant reduction in water vapor concentration, from 18-22 g/m³ to 13.5-18.3 g/m³.
- Total energy savings reached up to 26.2% when compared to conventional air conditioning processes.
Conclusions:
- Membrane dehumidification is an effective technology for reducing indoor humidity in tropical climates.
- The PAN/PDMS hollow fiber membrane system demonstrates significant energy savings and avoids cross-contamination.
- This technology offers a promising, energy-efficient solution for improving indoor air quality and comfort.
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