Pumps as Turbines and Induction Motors as Generators for Energy Recovery in Water Supply Systems

Williams, Arthur; Smith, Nigel; Bird, Chaunceton B.; Howard, M.

doi:10.1111/j.1747-6593.1998.tb00169.x

Cited by 30 publications

(17 citation statements)

References 2 publications

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“…However, it is worth mentioning that the feed-in-tariff regulations vary considerably between countries and, for example, in the UK, a micro-hydropower plant (MHP) downstream from any pumping station is not eligible for the subvention [12]. In addition to the abovementioned synergies with the existing WSS facilities, the energy produced may justify the installation of a grid-connected generator or local consumption [13]; the latter provides financial savings by avoiding external consumption and expensive electrical connections [14]. The installation of these systems is highly dependent on the costs associated with the turbine, construction and grid connection [4].…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery Using Micro-Hydropower Technology in Water Supply Systems: The Case Study of the City of Fribourg

Samora

Manso

Franca

et al. 2016

Water

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Abstract:Water supply systems (WWSs) are one of the main manmade water infrastructures presenting potential for micro-hydropower.Within urban networks, local decentralized micro-hydropower plants (MHPs) may be inserted in the regional electricity grid or used for self-consumption at the local grid level. Nevertheless, such networks are complex and the quantification of the potential for micro-hydropower other than that achieved by replacing pressure reducing valves (PRVs) is difficult. In this work, a methodology to quantify the potential for hydropower based on the excess energy in a network is proposed and applied to a real case. A constructive solution is presented based on the use of a novel micro-turbine for energy conversion, the five blade tubular propeller (5BTP). The location of the MHP within the network is defined with an optimization algorithm that maximizes the net present value after 20 years of operation. These concepts are tested for the WSS in the city of Fribourg, Switzerland. The proposed solution captures 10% of the city's energy potential and represents an economic interest. The results confirm the location of PRVs as potential sites for energy recovery and stress the need for careful sensitivity analysis of the consumption. Finally, an expedited method is derived to estimate the costs and energy that one 5BTP can produce in a given network.

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Section: Introductionmentioning

confidence: 99%

Energy Recovery Using Micro-Hydropower Technology in Water Supply Systems: The Case Study of the City of Fribourg

Samora

Manso

Franca

et al. 2016

Water

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“…9. In order to start the computations we have used Williams [22] correlation to obtain the nominal values in turbine mode from nominal pump mode. In this case we need to know, besides the head and flowrate, the maximum efficiency of the pump.…”

Section: Numerical Results For the Pump Working As Turbine In Reversementioning

confidence: 99%

Accuracy details in realistic CFD modeling of an industrial centrifugal pump in direct and reverse modes

Páscoa

Silva

Pinheiro³

et al. 2010

J. Therm. Sci.

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Numerical computation of the flowfield inside a pump is herein used as a numerical laboratory, subject to the limitations of modeling assumptions and to experimental verification. A numerical computation of the flow inside a real industrial centrifugal pump is performed that includes a very sophisticated geometry. Conversely to other computations, in this test case no simplification of the geometry was introduced. Numerical computations are obtained using Spalart-Allmaras turbulence model. A detailed analysis of the turbulent flowstructure is performed for the design point and two off design conditions. Additional computations were performed in order to compare the numerical and experimental pump characteristics; these were obtained under normalized testing conditions. Further computations are presented for the pump working in reverse turbine mode (PAT). Detailed analyses of the flow allow a comparison of the internal flow losses when the pump is operating in direct and reverse mode. This is also useful to help in the selection of an adequate pump geometry that can work in both modes with best efficiency.

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“…Some studies proposed stand-alone solutions at remote sites, where there are local power requirements in absence of the electrical grid [12,13], while other works investigated the potential of small hydropower in the water industry, figuring out the benefits of an energy strategy [11,14] and the economic feasibility of a small-scale plant [15,16] and raising some technical issues [17,18].…”

Section: Introductionmentioning

confidence: 99%

PAT Design Strategy for Energy Recovery in Water Distribution Networks by Electrical Regulation

et al. 2013

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In the management of water distribution networks, large energy savings can be yielded by exploiting the head drop due to the network pressure control strategy, i.e., for leak reductions. Hydropower in small streams is already exploited, but technical solutions combining efficiency and economic convenience are still required. In water distribution networks, an additional design problem comes out from the necessity of ensuring a required head drop under variable operating conditions, i.e., head and discharge variations. Both a hydraulic regulation (HR)-via a series-parallel hydraulic circuit-and an electrical regulation (ER)-via inverter-are feasible solutions. A design procedure for the selection of a production device in a series-parallel hydraulic circuit has been recently proposed. The procedure, named VOS (Variable Operating Strategy), is based on the overall plant efficiency criteria and is applied to a water distribution network where a PAT (pump as a turbine) is used in order to produce energy. In the present paper the VOS design procedure has been extended to the electrical regulation and a comparison between HR and ER efficiency and flexibility within a water distribution network is shown: HR was found more flexible than ER and more efficient. Finally a preliminary economic study has been carried out in order to show the viability of both systems, and a shorter payback period of the electromechanical equipment was found for HR mode.

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Pumps as Turbines and Induction Motors as Generators for Energy Recovery in Water Supply Systems

Cited by 30 publications

References 2 publications

Energy Recovery Using Micro-Hydropower Technology in Water Supply Systems: The Case Study of the City of Fribourg

Energy Recovery Using Micro-Hydropower Technology in Water Supply Systems: The Case Study of the City of Fribourg

Accuracy details in realistic CFD modeling of an industrial centrifugal pump in direct and reverse modes

PAT Design Strategy for Energy Recovery in Water Distribution Networks by Electrical Regulation

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