Indoor air humidity control by triethylene glycol (TEG) liquid membrane supported on a microporous membrane was investigated. Permeation rate of water vapor through the supported liquid membrane was measured, and the selectivity of water vapor with respect to air was over 2000 by calculating their solubility in TEG. Air humidity control was conducted using a flat membrane module in experiment and in practical air dehumidification/ humidification could be carried out by the same equipment.
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