Preparation and characterization of PES and PSU membrane humidifiers

► Mixed polymers (PSU and PES) with nanoparticles TiO2 were prepared as membrane humidifier. ► Membranes with high porosity and unsuitable forming of cavities have poor mechanical results. ► Membranes which were prepared with PSU polymer, lower percentage of polymers in casting solution (10 wt%) and NMP as solvent showed better humidification. ► Adding TiO2 nanoparticles enhanced the humidification. Relative humidity of outlet gas decreased by increasing in gas flow rate, flow channel pressure and module temperature.