Energy Saving in a Water Supply Network by Coupling a Pump and a Pump As Turbine (PAT) in a Turbopump

Carravetta, Armando; Antipodi, Lauro; Golia, Umberto; Fecarotta, Oreste

doi:10.3390/w9010062

Cited by 33 publications

(28 citation statements)

References 37 publications

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“…The differential pressure between the front and rear cross-sections of the annular slit flow was deduced from Equation (36), which can be expressed as…”

Section: Motion Modelmentioning

confidence: 99%

“…In recent years, the numerical simulation of the bidirectional fluid-structure interaction has become an important tool of fluid machinery analysis, which considered the interaction between the fluid domain and the structural domain so that the computational results were closer to real physical phenomena. At present, the numerical simulation of the bidirectional fluid-structure interaction was mainly applied to the research findings in the rotating machineries such as the centrifugal pumps [34], the fans [35] and the turbines [36], but a very limited discussed on the piped carriage in HCPs has been presented. In this study, the bidirectional fluid-structure interaction between the structural domain of the piped carriage and the fluid domain within the pipelines was numerically investigated by using the commercial CFD software ANSYS-Fluent 12.0, and the effects of guide vane placement angle on the hydraulic characteristics of transporting the piped carriage within the horizontal pipelines were studied by identifying average speeds, velocity distributions, pressure distributions, vorticity magnitude distributions, pressure drop characteristics, mechanical efficiencies, as well as force statistics during the movement of the single piped carriage.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

Zhang

Sun

et al. 2018

Water

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With the rapid growth of agricultural trade volumes, the transportation of agricultural products has received widespread attention from society. Aiming at these problems of low transport efficiency and high transport cost in long-distance transport of agricultural products, an energy-saving and environmental-friendly transport mode of agricultural machinery-hydraulic capsule pipelines (HCPs)-was proposed. HCPs effectively solve issues like traffic congestion, energy crises, and atmospheric pollution. Published literature is mainly limited to the capsule speed and the pressure drop characteristics of the fluid within the pipelines. This research was conducted on the following four aspects of HCPs. Firstly, the structure of the carrier was improved and called a 'piped carriage'. Secondly, a coupled solution between the structural domain of the piped carriage and the fluid domain within the pipelines was numerically investigated by using the commercial CFD software ANSYS Fluent 12.0 based on the bidirectional fluid-structure interaction methods. Thirdly, the effects of guide vane placement angle on hydraulic characteristics of the internal flow field within the horizontal pipelines transporting the piped carriage were extensively evaluated. Finally, based on least-cost principle, an optimization model of HCPs was established. The results indicated that the simulated results were in good agreement with the experimental results, which further demonstrated that it was feasible to adopt the bidirectional fluid-structure interaction methods for solving the hydraulic characteristics of the internal flow field when the piped carriage was moving along the pipelines. This article will provide an abundant theoretical foundation for the rational design of HCPs and its popularization and application.

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“…The differential pressure between the front and rear cross-sections of the annular slit flow was deduced from Equation (36), which can be expressed as…”

Section: Motion Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

Zhang

Sun

et al. 2018

Water

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“…In the last few years, interesting and numerous efforts have been dedicated to unravelling the knot and to define general equations able to transpose the characteristic curve of a pump to the correspondent in reverse mode, adopting experimental set-up [18,19], computational fluid dynamics applications (CFDs) [20][21][22], literature data [23], or proposing new devices [24]. Jain and Patel [25] presented a detailed state of the art about this aspect; several researchers, with the aim to analyze the behavior of a pump in a turbine mode, had defined several and sometimes really different relations for the prediction of PAT efficiency, based on specific speed in pump mode.…”

Section: Introductionmentioning

confidence: 99%

Innovative mini-hydro device for the recharge of electric vehicles in urban areas

Balacco

Binetti

Caporaletti

et al. 2018

Int J Energy Environ Eng

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The aim of the present study is to evaluate the technical and economic feasibility of supplying recharge points for Electric Vehicles converting water pressure in excess into electric energy from a water distribution network. A real water distribution network was analyzed, by designing a power station consisting of three components: a Pump-as-Turbine, an ad hoc generator, and a control system. The last one controls the flow rate trend at the inlet of the Pump-as-Turbine to regulate the rotational speed corresponding to the optimal range of efficiency. Energy produced permits to supply a recharging point for Electric Vehicles on site with the aim to convert water pressure generally dissipated and, consequently, lost into a renewable energy and to reduce power grid congestion. The economic analysis confirms the convenience of the proposed power station, and overall, a comparable cost with pressure reduction valve devices normally adopted to control pressure pattern and leakages of a water distribution network.

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“…Moreover, head losses from the freshwater storage tank to the hydropower plant have been considered negligible as well, due to the shortness of the branch. Further explanations of plant operation are provided in [21]. A deep investigation about the relationship between turbined and pumped discharge, as well as the relationship between pressure head and head loss within the PAT, has been carried out by [21].…”

mentioning

confidence: 99%

“…Further explanations of plant operation are provided in [21]. A deep investigation about the relationship between turbined and pumped discharge, as well as the relationship between pressure head and head loss within the PAT, has been carried out by [21]. Indeed, [21] analyzed different working conditions depending on the number of stages of both the PAT and the pump.…”

mentioning

confidence: 99%

Energy Transfer from the Freshwater to the Wastewater Network Using a PAT-Equipped Turbopump

Morani

Carravetta

Fecarotta

et al. 2019

Water

Self Cite

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A new strategy to increase the energy efficiency in a water network exists using turbo pumps, which are systems consisting of a pump and a turbine directly coupled on a same shaft. In a turbo pump, the pump is fed by a turbine that exploits a surplus head in a freshwater network in order to produce energy for one system (wastewater) and reduce the excess pressure in another (drinking water). A pump as turbine (PAT) may be preferred over a classic turbine here due to its lower cost. The result of such a coupling is a PAT–pump turbocharger (P&P). In this research, the theoretical performance of a P&P plant is employed using data from a real water distribution network to exploit the excess pressure of a freshwater stream and to feed a pump conveying wastewater toward a treatment plant. Therefore, the P&P plant is a mixed PAT–pump turbocharger, operating with both fresh and wastewater. A new method to perform a preliminary geometric selection of the machines constituting the P&P plant has been developed. Furthermore, the plant operation has been described by means of a new mathematical model under different boundary conditions. Moreover, the economic viability of the plant has been assessed by comparison with a conventional wastewater pumping system working in ON/OFF mode. Therefore, the net present value (NPV) of the investment has been evaluated in both situations for different time periods. According to the economical comparison, the PAT–pump turbocharger represents the most economically advantageous configuration, at least until the useful life of the plant. Such convenience amounts to 175% up to a time period equal to 20 years.

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Energy Saving in a Water Supply Network by Coupling a Pump and a Pump As Turbine (PAT) in a Turbopump

Cited by 33 publications

References 37 publications

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

Innovative mini-hydro device for the recharge of electric vehicles in urban areas

Energy Transfer from the Freshwater to the Wastewater Network Using a PAT-Equipped Turbopump

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