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Feed pressure has also been used as a model parameter.
The software at the DCS reduces the feed pressure if temperature increases or vice versa.
The considered input variables were the feed temperature, the feed flow-rate and the feed pressure.
Voltage increase as well as propellant feed pressure decrease are observed over the life test.
High hydrogen purities can also be achieved by operating at high feed pressure values.
At constant seawater feed temperature and concentration, the produced water quantity increases with increasing feed pressure.
Higher oxygen feed pressure will reduce the yield as well as the selectivity.
H2O2 yield and selectivity improved both with H2 feed pressure, however.
Interestingly, increasing the feed flow rate and feed pressure were found to be beneficial but the former led to lower H2 recovery whilst the latter did not deliver the same purity when compared to lower feed pressure.
From the design point of view, it seems that, if newer technologies move toward decreasing the feed pressure to possibly save on pumping power requirement, the required membrane area may become much more sensitive to the feed pressure.
Consequently, it provides a narrower flux distribution and a better permeate quality without affecting significantly the feed pressure.
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