Fig. 5: Comparison between experimental (symbols) and model (shaded areas) results.
Two scenarios were considered, that is, (a) a case where pure water flows in both channels with the temperature being the only driving force (i.e., MD mode), and (b) the OMD case, where pure water and 4 M CaCl2 aqueous solution flow in the feed and draw channels, respectively. Steady-state specific vapor mass flow rates Jw were reported as function of the bulk temperature of the feed stream, under different bulk temperature values of the draw stream (i.e., Tdraw). The shaded area represents the prediction of the model between the thermodynamic upper limit and the case with polarization coefficients equal to 0.4. The lines are the best fit of the experimental data using the polarization coefficients as fitting parameters. The same color and symbol code was used in presenting the results here and in Fig. 4.
