| A | Size of the test membrane (m2) |
| B | Total mass transfer coefficient (kg/m2/Pa/s) |
| cf | Concentration of the feed |
| cp | Concentration of the permeate water |
| J | Transmembrane flux (kg/m2/h) |
| m | Mass of the permeate water collected (kg) |
| Pf | Vapor pressure of the feed side (Pa) |
| Pc | Vapor pressure of the cooling side (Pa) |
| R | Salt rejection |
| t | Predetermined time of the experimental process (h) |
| Greek letter | |
| Σ | Efficiency coefficient |
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