A new approach for the prediction of speed-adjusted pump efficiency curves

Coelho, Bernardete; Andrade‐Campos, A.

doi:10.1080/00221686.2016.1175521

Cited by 13 publications

(12 citation statements)

References 14 publications

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“…As it was mentioned previously in the introduction, the affinity laws present an incongruence to calculate the efficiency [39]. However, Coelho and Andrade-Campos [41] proposed an expression that corrects the inaccuracy of the affinity laws. This expression (15) relates the real efficiency or the corrected efficiency (η2) when the rotational speed of a pump is (N2) and the estimated efficiency (η1) when the rotational speed is (N1).…”

Section: Mathematical Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Use of Fixed and Variable Speed Pumps in Water Distribution Networks with Different Control Strategies

Briceño-León

Iglesias-Rey

Martínez-Solano

et al. 2021

Water

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The control system’s point is to bring the pumping curve close to the set-point curve. That concept is essential for proper design of a pumping station. An adequate design is focused not only on selecting the total number of pumps and the type of control to use (flow or pressure), but it also is important to determine the optimal number of fixed speed pumps (FSPs) and variable speed pumps (VSPs) for each flow rate. This work discusses the most common methods and procedures for control systems on a design of pumping stations with a proposed methodology. This methodology consists of expressing the characteristics of the pumping curve and the set-point curve in a dimensionless form so that the methodology is standardized for any pump model and set-point curve. These formulations allow us to discuss how the characteristic of a pump and the set-point curve of the network influence the optimal number of FSPs and VSPs in energy terms. In general, the objective of this work is to determine the most suitable total number of pumps in a pumping station design and to determine the optimal pumping configuration in every flow rate, thus the consumed energy would be the minimum. Additionally, this methodology develops an expression to estimate the performance of a frequency inverter when a VSP operates at different rotational speeds. This work will be applied to different study cases, and the obtained results allow us to question several usual procedures for pumping control system. In general, it can be concluded that the number of pumps of a pumping system cannot be inferred in a simple form without a deep analysis of a control system.

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Section: Mathematical Formulationmentioning

confidence: 99%

“…However, there are expressions that reduce this inaccuracy, such as Sarbu and Borza expressions [40]. Later, Coelho and Andrade-Campos [41] developed an expression to correct the deviation of the BEP of the affinity laws.…”

Section: Introductionmentioning

confidence: 99%

Use of Fixed and Variable Speed Pumps in Water Distribution Networks with Different Control Strategies

Briceño-León

Iglesias-Rey

Martínez-Solano

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…This is done for the following reasons: (a) VSP relative efficiency (efficiency at actual speed over efficiency at maximum speed) is high i.e. almost equal to 1 in this range (Marchi et al 2012;Coelho and Andrade-Campos 2016); (b) the efficiency of Variable Frequency Drive (VFD), the most common technology used to vary the speed of pump's motor, is usually between 95% and 98% in the aforementioned range of relative speeds and it drops significantly at lower speed (Ulanicki, et al 2008). Additionally, motor's efficiency increases with the increase in its load and most motors reach their maximum efficiency when their load is above 75% of their rated load (Kaya et al 2008;Marchi and Simpson 2013;Kalaiselvan et al 2016).…”

Section: Pump Scheduling Problem and Assumptionsmentioning

confidence: 99%

Fast Pump Scheduling Method for Optimum Energy Cost and Water Quality in Water Distribution Networks with Fixed and Variable Speed Pumps

Abdallah

Kapelan

2019

J. Water Resour. Plann. Manage.

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Supplying high quality water at competitive cost is a major challenge for water utilities worldwide, especially with ever increasing water quality standards and energy prices. A number of pump scheduling methods for optimising simultaneously water quality and energy cost have been developed already. However, none of these methods is ideal due to the complexity of water networks and the nonlinear behaviour of water flow. In this research, a new optimisation method named iterative Extended Lexicographic Goal Programming (iELGP) is developed to optimize energy cost and water quality (residual chlorine) in water networks with a mixture of fixed speed pumps (FSPs) and variable speed pumps (VSPs). Two different approaches were used to indirectly improve chlorine. The new method was tested on the C-Town water network and compared with the graph theory method of Price and Ostfeld (2016). The results obtained show the ability of the iELGP method to optimize energy cost and water quality in water networks and in a computationally very efficient manner. They also show that the iELGP method can identify lower energy cost pump schedules and do this faster than the above comparison method. Using VSPs instead of FSPs improves the water quality and decreases the related energy and maintenance cost in water networks.

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“…Hydropower consumption and costs are frequently ignored. Vilanova & Balestieri (2016), Krajacica et al (2016) and Coelho & Andrade-Campos (2016) report that different criteria of ER volume provide a greater or smaller impact on the consumption of electric energy. This is compounded by the fact that hydropower consumption and costs are not mentioned in traditional technical norms when the dimension of useful volume on the WSS reservoir is undertaken.…”

Section: Introductionmentioning

confidence: 99%

The Importance of the Size of the Reservoir’s Useful Volume for Consumption and Cost Decrease in Electricity

Moreira¹,

Pereira²

2020

J. Urb. Environ. Engng

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Current paper analyzes the reservoir's useful water volume for hydropower efficiency in water supply systems. Data, retrieved from the Guanabara Water Supply System of the municipality of Ananindeua, state of Pará, Brazil, were analyzed. Two useful volume sizes were determined following recommendations by NBR 12.217/1994 "Project on the water distribution reservoir for public supply". The former featured the time curve of water consumption and the latter the rate of maximum daily discharge. The latter stage assessed the most adequate useful water volume from the point of view of hydropower efficiency by Epanet 2.0. Dimensions with or without water consumption curve provided useful volumes of 838 m3 and 2.043 m3, respectively. In the case of the lowest volume, 47 hours/day of CMB functioning and 987 kWh/day of electric power consumption in EAT were detected.

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A new approach for the prediction of speed-adjusted pump efficiency curves

Cited by 13 publications

References 14 publications

Use of Fixed and Variable Speed Pumps in Water Distribution Networks with Different Control Strategies

Use of Fixed and Variable Speed Pumps in Water Distribution Networks with Different Control Strategies

Fast Pump Scheduling Method for Optimum Energy Cost and Water Quality in Water Distribution Networks with Fixed and Variable Speed Pumps

The Importance of the Size of the Reservoir’s Useful Volume for Consumption and Cost Decrease in Electricity

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