Minimizing energy consumption in reverse osmosis membrane desalination using optimization-based control

Bartman, Alex R.; Zhu, Aihua; Christofides, Panagiotis D.; Cohen, Yoram

doi:10.1109/acc.2010.5530614

Cited by 10 publications

(11 citation statements)

References 25 publications

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“…Feed water temperature of 300 K, a salinity of 5000 ppm was taken and other parameters for PV array, motor, and pump are from [3] and are below. A simple hill-climbing (Perturb & Observer) algorithm was developed to manipulate the position of the valve in order to track the maximum power point.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…In the recent years, the interest in the use of reverse osmosis membrane desalination has increased due to the energy efficiency and versatility of this process relative to other water desalination technologies [2]. When operating the reverse osmosis desalination unit it is imperative that system conditions are monitored and maintained at appropriate set points in order to produce the required amount of clean, portable water while preventing system damage [3]. It is also desirable to find the operating methods to reduce the energy consumption of the reverse osmosis desalination plant in the presence of variability of feed water salinity and input power.…”

Section: Introductionmentioning

confidence: 99%

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Directly Driven RO System by PV Solar Panel Arrays

Elshafei¹,

Sheikh²,

Ahmad³

2013

OJAppS

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In this work the performance evaluation of directly driven Reverse Osmosis (RO) water desalination system by Photovoltaic (PV) arrays is investigated by a novice method. Reverse Osmosis water desalination system needs continuous supply of energy and on the other hand energy from the PV is intermittent in nature. The energy consumption of RO plant is strong function of clean water (permeate) flow rate and system pressure and they needs to be tuned to match the maximum power provided by the PV arrays. In this work a novice method to tune the RO system parameters by manipulating the position of the valve at the brine side of the RO system is proposed. A simple perturb and observe algorithm is used for automatic control of the valve position. The performance of the proposed battery less system is compared with a conventional system using PV, charge controller and battery. The proposed directly driven battery-less system provides more water per day than battery operated system.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Directly Driven RO System by PV Solar Panel Arrays

Elshafei¹,

Sheikh²,

Ahmad³

2013

OJAppS

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“…Works investigating the SEC in steady-state operation of the RO plant are available in the literature [61,67,68]. But different from the RO plants powered by the electric grid in which the power input is constant, PV powered RO plants are operated along a large variety of power supplies subject to the availability of intermittent solar energy.…”

Section: Stand-alone Solar Pv Powered Ro Desalination Plantmentioning

confidence: 99%

Stand-alone seawater RO (reverse osmosis) desalination powered by PV (photovoltaic) and PRO (pressure retarded osmosis)

Wang

Shaheed

2015

Energy

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a b s t r a c tA novel RO seawater desalination plant powered by PV (Photovoltaic) and PRO (PVROPRO) is proposed and the feasibility of two stand-alone schemes, SSRO (salinity-solar powered RO) operation and SRO (salinity powered RO) operation, are investigated. First, the stand-alone feasibility of the plant is thermodynamically analysed. In doing so, on the basis of mathematical models describing RO, PRO and the PV array, the stand-alone feasibility is numerically investigated and the feasible operational windows for the two operation schemes, SSRO and SRO, are identified. In addition, the detrimental effects, CP (concentration polarization) and RSP (reverse salt permeation) in the mass transfer, on the operational windows are investigated. Finally, a case study of the proposed PVROPRO plant is developed based on the hourly solar data of Perth Australia in a year. The highest weekly production rate is found to be almost 20 times the rate in PVRO in the same week. Annual production is increased more than nine times compared to the stand-alone PVRO plant. Furthermore, it is found that, due to detrimental effects the weekly PW (product water) production rate is decreased in the range of 16e20% and the overall annual reduction is 18.07%.Crown

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“…The MPPT evaluates the osmotic power generated by the hydro-turbine (HT) and adjust the applied hydraulic pressure on the draw solution. The pressure transition can be achieved by changing the displacement of the valves or/and using the variable frequency drive to change the speed of the high-pressure pump (HP) [32]. Based on the different algorithms of the MPPT controller, four different MPPT controllers introduced earlier, P&O, IMR, FLC and MFC, are used and studied to search the MPP.…”

Section: Evaluation and Comparison Of Mppt Controllersmentioning

confidence: 99%

Maximum power point tracking (MPPT) control of pressure retarded osmosis (PRO) salinity power plant: Development and comparison of different techniques

Luo

Kiselychnyk

et al. 2016

Desalination

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. (2016) Maximum power point tracking (MPPT) control of pressure retarded osmosis (PRO) salinity power plant : development and comparison of different techniques. Desalination,. Permanent WRAP URL:http://wrap.warwick.ac.uk/78938 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Abstract:This paper presents two new methods for the maximum power point tracking (MPPT) control of a pressure retarded osmosis (PRO) salinity power plant, including mass feedback control (MFC) and fuzzy logic control (FLC). First, a brief overview of perturb & observe (P&O) and incremental mass resistance (IMR) control is given as those two methods have already demonstrated their merit in good control performance. Then, two new methods employing variable-step strategy, MFC and FLC, are proposed to address the trade-off relationship between rise-time and oscillation of P&O and IMR. Genetic Algorithm (GA) is used for finding the optimum parameters of membership functions of FLC. From the case-study of start-up of the PRO adopting MPPT control, MFC and FLC have shown faster convergence to the target performance without oscillation compared with P&O and IMR. These four MPPT techniques are further evaluated in case-studies of state transitions of the PRO due to operational fluctuations. It is proven that the MPPT using FLC and modified MFC has better performance than the other two methods. Finally, the paper reports a comparison of major characteristics of the four MPPT methods, which could be considered as guidance for selecting a MPPT technique for the PRO in practice. IntroductionPressure retarded osmosis (PRO) is a promising method which is potentially capable of producing power and processing water simultaneously because of its nature of combination of the water treatment and renewable energy generation. In other words, it can be used as not only a clean energy generator, but also a water treatment to recycle water. In a PRO plant, chemical potential between the two salinities is converted to hyd...

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Minimizing energy consumption in reverse osmosis membrane desalination using optimization-based control

Cited by 10 publications

References 25 publications

Directly Driven RO System by PV Solar Panel Arrays

Directly Driven RO System by PV Solar Panel Arrays

Stand-alone seawater RO (reverse osmosis) desalination powered by PV (photovoltaic) and PRO (pressure retarded osmosis)

Maximum power point tracking (MPPT) control of pressure retarded osmosis (PRO) salinity power plant: Development and comparison of different techniques

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