Table 5: Heat flux for evaporation at different vacuum degrees for the PVDF and PTFE membranes.

Feed flow rate () (mL/s)Heat flux, (W), PVDFHeat flux, (W), PTFE
vacuum degree kPa at 65°Cvacuum degree kPa at 65°C
9294969792949697

7.774.264.5103.2125.880.6122.5132.2161.2
16.3116.0116.0163.8184.3136.5191.2204.8245.7
27.0158.3158.3226.1260.1192.2260.1271.4328.0
30.6153.8179.4294.7346.0217.8333.2346.0410.1