Volume 14 Issue 3 February - April 2019
Research Paper
Giuma Fellah*
* Professor, Department of Mechanical
and Industrial Engineering, Faculty of Engineering, University of Tripoli,
Libya.
Fellah,G. (2019). Performance Assessment
of Ro Desalination Plant at Different Salinities and Recovery Ratios. i-manager’s
Journal on Future Engineering and Technology,14 (3), 1-9. https://doi.org/10.26634/jfet.14.3.15516
Abstract
Two parameters
might affect the thermodynamic performance of Reverse Osmosis (RO) desalination
plants, those are the recovery ratio and feed water salinity. Exergy analysis
is performed to determine the effect of those parameters on the thermodynamic
performance of a reverse osmosis desalination unit. Irreversibility,
effectiveness, and specific energy consumption are obtained at different
recovery ratios and salinities. The results of the developed thermodynamic
model of the present work are validated against the obtained results from the
literature, where the effectiveness and the contributions of the membrane,
high-pressure valves, friction, and the other components to total
irreversibility are compared. The results show that the contribution of the high
valve and membranes to total irreversibility depends strongly on the recovery
ratio. The contribution of other components to total irreversibility is a minor
one. The effect of source salinity on the percentage of the recovered exergy is
not substantial, for instance, it is found that 7.96% and 6.88% of the
destroyed exergy can be recovered, at salinities of 1000 ppm and 5000 ppm,
repectively. The analysis shows that using the Pelton wheel to recover part of
the destroyed exergy is only reasonable at low and moderate recovery ratio. For
instance, the input power decreases by 7% and 60% for recovery ratio of 0.9 and
0.1, respectively.
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