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Exergy Analysis of a Two-Pass Reverse Osmosis (RO) Desalination Unit with and without an Energy Recovery Turbine (ERT) and Pressure Exchanger (PX)

Lookup NU author(s): Mohamed Eshoul, Professor Brian Agnew

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Abstract

This paper presents an exergy analysis of an actual two-pass (RO) desalination system with the seawater solution treated as a real mixture and not an ideal mixture. The actual 127 ton/h two pass RO desalination plant was modeled using IPSEpro software and validated against operating data. The results show that using the (ERT) and (PX) reduced the total power consumption of the SWRO desalination by about 30% and 50% respectively, whereas, the specific power consumption for the SWRO per m(3) water decreased from 7.2 kW/m(3) to 5.0 kW/m(3) with (ERT) and 3.6 kW/m(3) with (PX). In addition, the exergy efficiency of the RO desalination improved by 49% with ERT and 77% with PX and exergy destruction was reduced by 40% for (ERT) and 53% for (PX). The results also showed that, when the (ERT) and (PX) were not in use, accounted for 42% of the total exergy destruction. Whereas, when (ERT) and (PX) are in use, the rejected seawater account maximum is 0.64%. Moreover, the (PX) involved the smallest area and highest minimum separation work.

Publication metadata

Author(s): Eshoul NM, Agnew B, Al-Weshahi MA, Atab MS

Publication type: Article

Publication status: Published

Journal: Energies

Year: 2015

Volume: 8

Issue: 7

Pages: 6910-6925

Online publication date: 10/07/2015

Acceptance date: 03/07/2015

ISSN (electronic): 1996-1073

Publisher: M D P I AG

URL: http://dx.doi.org/10.3390/en8076910

DOI: 10.3390/en8076910

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