Optimization of Path for  Water Transmission and Distribution Systems

Sârbu, Ioan; Valea, Emilian Stefan

doi:10.1007/978-94-007-7684-5_23

Cited by 11 publications

(18 citation statements)

References 10 publications

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“…. c 9 are the coefficients of the objective function depending on the parameters a, b, α, β, r 0 , q 0 , and L as shown in [38].…”

Section: Pumped Storage Tanksmentioning

confidence: 99%

“…Therefore, as indicated in [30], for the particularly case of the large pumps the changes in efficiency can be neglected if the changes in speed rate do not exceed 1/3 from the nominal pump speed. Figure 2 shows the variation curves of pump head (H), flow rate (Q), power (P), and efficiency (η) for centrifugal pumps depending on pump speed n. It can be observed that a reduction of 20% of the pump speed will lead to the decreasing of power demand of 50% at constant pump efficiency.…”

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confidence: 99%

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A Study of Energy Optimisation of Urban Water Distribution Systems Using Potential Elements

Sârbu

2016

Water

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Energy use in water supply systems represents a significant portion of the global energy consumption. The electricity consumption due to the water pumping represents the highest proportion of the energy costs in these systems. This paper presents several comparative studies of energy efficiency in water distribution systems considering distinct configurations of the networks and also considers implementation of the variable-speed pumps. The main objective of this study is the energy optimisation of urban systems using optimal network configurations that reduce energy consumption and improve energy efficiency. The paper describes in detail four strategies for improving energy efficiency of water pumping: control systems to vary pump speed drive according to water demand, pumped storage tanks, intermediary pumping stations integrated in the network, and elevated storage tanks floating on the system. The improving energy efficiency of water pumping is briefly reviewed providing a representative real case study. In addition, a different approach for the hydraulic analysis of the networks and the determination of the optimal location of a pumped storage tank is provided. Finally, this study compares the results of the application of four water supply strategies to a real case in Romania. The results indicate high potential operating costs savings.

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“…. c 9 are the coefficients of the objective function depending on the parameters a, b, α, β, r 0 , q 0 , and L as shown in [38].…”

Section: Pumped Storage Tanksmentioning

confidence: 99%

mentioning

confidence: 99%

A Study of Energy Optimisation of Urban Water Distribution Systems Using Potential Elements

Sârbu

2016

Water

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“…that the efficiency curve will be only shifted to the left in case of speed reduction. Equation (2) is given by Sârbu and Borza (1998), which provides an analytical relationship between two different speeds (N 1 and N 2 ) and the corresponding efficiencies (η 1 , η 2 ).…”

Section: Pump Operation At Variable Speedsmentioning

confidence: 99%

“…Therefore, as indicated in Sârbu and Borza (1998), the changes in efficiency can be neglected if the changes in speed rate do not exceed the 33 % of the nominal pump speed and this approximation is particularly justified for large pumps. However, this approximation only states that the pump curve points will maintain the same efficiency, e.g.…”

Section: Pump Operation At Variable Speedsmentioning

confidence: 99%

“…In addition, prediction of the total efficiency of VSP system is not clear specifically at light loads. Although it is known that the efficiency decreases when the speed rate is reduced (Lingireddy and Wood, 1998;Sârbu and Borza, 1998), Walski et al (2003) showed that the efficiency can be considerably lower than expected also for small reduction of the pump speed rate (although the pump that was tested in the laboratory was quite small).…”

Section: Introductionmentioning

confidence: 96%

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Assessing variable speed pump efficiency in water distribution systems

Marchi

Simpson

Ertugrul

2012

Drink. Water Eng. Sci.

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Abstract. Energy savings and greenhouse gas emission reductions are increasingly becoming important design targets in many industrial systems where fossil fuel based electrical energy is heavily utilised. In water distribution systems (WDSs) a significant portion of operational cost is related to pumping. Recent studies have considered variable speed pumps (VSPs) which aim to vary the operating point of the pump to match demand to pumping rate. Depending on the system characteristics, this approach can lead to considerable savings in operational costs. In particular, cost reductions can take advantage of the demand variability and can decrease energy consumption significantly. One of the issues in using variable speed pumping systems, however, is the total efficiency of the electric motor/pump arrangement under a given operating condition. This paper aims to provide a comprehensive discussion about the components of WDS that incorporate variable speed pumps (including electric motors, variable frequency drives and the pumps themselves) to provide an insight of ways of increasing the system efficiency and hence to reduce energy consumption. In addition, specific attention is given to selection of motor types, sizing, duty cycle of pump (ratio of on-time and time period), losses due to installation and motor faults. All these factors affect the efficiency of motor drive/pump system.

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A review of modelling and optimisation techniques for district heating systems

2019

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Summary This article provides an extensive survey on the modelling and optimisation of district heating systems (DHSs) focused on the heat distribution network. For this purpose, the major components of a DHS have been described and discussed, and their modelling has been briefly reviewed, including numerical simulation models for heat sources, end‐users, and especially the distribution network. The main deterministic and heuristic optimisation techniques are briefly described. Additionally, a single‐objective and multiobjective optimisation problem is generally formulated, and the main optimisation criteria for the design and operation of the distribution network are synthesised and analysed. The state of the art in DHS optimisation has been also reviewed and categorised. Finally, some recommendations for future developments were included.

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Optimization of Path for Water Transmission and Distribution Systems

Cited by 11 publications

References 10 publications

A Study of Energy Optimisation of Urban Water Distribution Systems Using Potential Elements

A Study of Energy Optimisation of Urban Water Distribution Systems Using Potential Elements

Assessing variable speed pump efficiency in water distribution systems

A review of modelling and optimisation techniques for district heating systems

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