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A flat-plate spiral-channeled membrane heat exchanger for methane dehumidification: Comparison of kraft paper and thin-film composite membrane
- Source :
- International Journal of Thermal Sciences. 167:107046
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Membrane heat exchangers were used for moisture and heat recovery from a hot and humid natural gas stream in indirect contact with an air stream. A plate membrane module with spiral channels on each side was designed to configure gas and air streams in co-current and counter-current flow. Two types of membranes, a commercial kraft paper, and a laboratory-made thin-film composite membrane, were used as the module core. The thermal efficiency and the water recovery from the humid gas were calculated and compared under different operating conditions. At a unit flow ratio of air/gas, the greatest effectiveness was achieved at a methane flow of 100 cm3/min, but water recovery increased at higher gas flows. For the counterflow configuration, an air/methane flow ratio of 2 was sufficient to achieve the highest total effectiveness and water recovery; however, larger air/gas ratios were beneficial to improve heat and moisture transfer for the co-current configuration. The highest water recovery by the kraft paper and composite membrane was achieved (approximately 15 mgH2O/cm2.h) for the input gas with the highest humidity. The dehumidification performance of kraft paper as a porous and hydrophilic membrane was slightly better than that of the composite membrane containing a dense hydrophilic polymer thin film in most cases. A relatively low heat transfer coefficient was found for the module, which was increased by using higher gas flow rates at higher humidity conditions.
- Subjects :
- Materials science
business.industry
020209 energy
General Engineering
Humidity
02 engineering and technology
Heat transfer coefficient
Condensed Matter Physics
01 natural sciences
Methane
010305 fluids & plasmas
chemistry.chemical_compound
chemistry
Thin-film composite membrane
Natural gas
Heat recovery ventilation
0103 physical sciences
Heat exchanger
0202 electrical engineering, electronic engineering, information engineering
Composite material
business
Kraft paper
Subjects
Details
- ISSN :
- 12900729
- Volume :
- 167
- Database :
- OpenAIRE
- Journal :
- International Journal of Thermal Sciences
- Accession number :
- edsair.doi...........6fb8175f2f979ab9cdded1da56b303e5