Flashed-feed VMD configuration as a novel method for eliminating temperature polarization effect and enhancing water vapor flux

Osmotically and Thermally Isolated Forward Osmosis–Membrane Distillation (FO–MD) Integrated Module

“…S1). 49 The increment of water flux (513%) was smaller than that of the partial vapor pressure difference (1,040%), likely due to temperature polarization caused by heat transfer from the feed to the permeate. 50 The with results presented in Fig.…”

Membrane distillation hybrids for water production and energy efficiency enhancement: A critical review

“…The vacuum enhanced AGMD process was also suggested to remove the non-condensable gases in the air-gap side to further increase the driving force of MD process [46]. There is only one study that reports a different feed side configuration where the effect of temperature polarization was decoupled from the membrane mass transfer coefficient by preventing the liquid feed from contacting the membrane surface of a VMD system [42]. The authors reported that with this flashed-feed configuration, a vapor water flux of 9 L/h.m 2 and 40 L/h.m 2 could be achieved with a transmembrane temperature difference of 5 o C and 10 o C, respectively, by eliminating the temperature polarization effect.…”

“…As any other process, MD has its drawbacks. Since it is a thermally-driven process, it remains an energy demanding technology [37,38], although the process can be competitive at large scale using waste heat [8,[39][40][41][42]. It presents several limitations, which are yet to be overcome, including relatively low permeate flux and water recovery ratio as compared to conventional membrane-based desalination such as RO.…”

Hollow fibre membrane-based liquid desiccant humidity control for controlled environment agriculture

“…A detailed description of the VMD concept and its main advantages and operational challenges can be found elsewhere (Alsaadi et. al., 2014;Alsaadi et. al., 2018;Fortunato et al, 2018).…”