Decision Support for the Design and Operation of Variable Speed Pumps in Water Supply Systems

Nowak, Dimitri; Krieg, Helene; Bortz, Michael; Geil, Christian; Knapp, Axel; Roclawski, Harald; Böhle, Martin

doi:10.3390/w10060734

Cited by 14 publications

(11 citation statements)

References 20 publications

(31 reference statements)

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“…Relaxation methods with piecewise linear underes- 2013, Misener and Floudas (2014). Besides these multi-purpose implementations, these methods can also be used to improve the solution process for domain specific optimization models, like for example shown by Pecci et al (2019) in the domain of water supply networks. The authors derived global bounds on the placement of valves by using a Branch-and-Bound algorithm with relaxed nonlinear constraints.…”

Section: Piecewise Linear Relaxed Pump Modelmentioning

confidence: 99%

“…A large part of the instances have a gap > ε, which is why a comparison of the gap at the end of the computation time is performed. As in Pecci et al (2019), the share of solved instances with a gap smaller δ, ρ(δ) = (# instances with gap ≤ δ)/(# test instances), is plotted for the remaining gap δ, cf. Fig.…”

Section: Performance Of Different Solution Approachesmentioning

confidence: 99%

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Optimization and validation of pumping system design and operation for water supply in high-rise buildings

et al. 2020

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The application of mathematical optimization methods for water supply system design and operation provides the capacity to increase the energy efficiency and to lower the investment costs considerably. We present a system approach for the optimal design and operation of pumping systems in real-world high-rise buildings that is based on the usage of mixed-integer nonlinear and mixed-integer linear modeling approaches. In addition, we consider different booster station topologies, i.e. parallel and series-parallel central booster stations as well as decentral booster stations. To confirm the validity of the underlying optimization models with real-world system behavior, we additionally present validation results based on experiments conducted on a modularly constructed pumping test rig. Within the models we consider layout and control decisions for different load scenarios, leading to a Deterministic Equivalent of a two-stage stochastic optimization program. We use a piecewise linearization as well as a piecewise relaxation of the pumps’ characteristics to derive mixed-integer linear models. Besides the solution with off-the-shelf solvers, we present a problem specific exact solving algorithm to improve the computation time. Focusing on the efficient exploration of the solution space, we divide the problem into smaller subproblems, which partly can be cut off in the solution process. Furthermore, we discuss the performance and applicability of the solution approaches for real buildings and analyze the technical aspects of the solutions from an engineer’s point of view, keeping in mind the economically important trade-off between investment and operation costs.

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Section: Piecewise Linear Relaxed Pump Modelmentioning

confidence: 99%

Section: Performance Of Different Solution Approachesmentioning

confidence: 99%

Optimization and validation of pumping system design and operation for water supply in high-rise buildings

et al. 2020

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“…Cabrera et al [18] claims that in EU the improvement of the pumping water systems can achieve 20-30% of energy consumption reduction. Nowak et al [19] furtherly contributed to the optimization of pumping systems, describing an optimization method for variable speed pumps and the achieved energy savings. In addition, Annus et al [20] studied the electricity savings with the application of Variable Speed Drives (VSD's) and the variation of a water system flow rate related to the circulation pumps in domestic household systems.…”

Section: Water-energy Nexus In Industries At Eu Levelmentioning

confidence: 99%

Water–Energy Nexus in Typical Industrial Water Circuits

Oliveira

Iten

Matos

et al. 2019

Water

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Water–energy nexus has been recognized as an important and challenging issue, namely in industry. This is due to industry reforms, increasing demand, and climate change. This concept focuses on the link between energy and water infrastructure. Overall, there is limited understanding of the nature of this link, as it is assumed that water is not a threat to the energy sector or an influence of the electricity to the water resources. This work aims to present and evaluate case studies related to typical industrial water circuits. These circuits represent some of the most relevant industrial sectors in terms of water–energy nexus such as: steel industry, chemical industry, paper and pulp industry, and food industry. Moreover, these sectors also cover typical industrial water circuits, namely: cooling circuit, gas washing circuit, water treatment circuit, transportation circuit, and quenching circuit. The circuits have firstly been assembled in OpenModelica software considering the equipment and physical layout of each circuit. According to their actual operation conditions, the energy and water consumption have been estimated. Furthermore, water and energy efficiency improvement measures have been proposed and implemented into the assembled models. This enabled a techno-economic assessment based on the implementation of the improvement measures. In order to contextualise these results into the industrial trends, the achieved water and energy savings are projected into potential national and sectorial savings considering the current levels of water and energy demand for each sector.

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“…However, this concept is quite complex to apply in water networks because there are many head systems as demand consume varies. In a similar way, Nowak et al [32] presented an optimization process using VSPs with different constraints in operational controls. There could be different pumping configurations with FSPs and VSPs for pumping stations in water networks.…”

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

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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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Decision Support for the Design and Operation of Variable Speed Pumps in Water Supply Systems

Cited by 14 publications

References 20 publications

Optimization and validation of pumping system design and operation for water supply in high-rise buildings

Optimization and validation of pumping system design and operation for water supply in high-rise buildings

Water–Energy Nexus in Typical Industrial Water Circuits

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

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