scholarly journals Robust optimization methodologies for water supply systems design

2012 ◽  
Vol 5 (1) ◽  
pp. 31-37 ◽  
Author(s):  
J. Marques ◽  
M. C. Cunha ◽  
J. Sousa ◽  
D. Savić
Keyword(s):  
Water Supply ◽  
Robust Optimization ◽  
Optimization Problems ◽  
Systems Design ◽  
Well Being ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Water Mains ◽  
Hydraulic Simulator ◽  
Supply Systems

Abstract. Water supply systems (WSSs) are vital infrastructures for the well-being of people today. To achieve good customer satisfaction the water supply service must always be able to meet people's needs, in terms of both quantity and quality. But unpredictable extreme conditions can cause severe damage to WSSs and lead to poorer levels of service or even to their failure. Operators dealing with a system's day-to-day operation know that events like burst water mains can compromise the functioning of all or part of a system. To increase a system's reliability, therefore, designs should take into account operating conditions other than normal ones. Recent approaches based on robust optimization can be used to solve optimization problems which involve uncertainty and can find designs which are able to cope with a range of operating conditions. This paper presents a robust optimization model for the optimal design of water supply systems operating under different circumstances. The model presented here uses a hydraulic simulator linked to an optimizer based on a simulated annealing heuristic. The results show that robustness can be included in several ways for varying levels reliability and that it leads to more reliable designs for only small cost increases.

scholarly journals Robust optimization methodologies for water supply systems design

2012 ◽  
Vol 5 (1) ◽  
pp. 173-192 ◽  
Author(s):  
J. Marques ◽  
M. C. Cunha ◽  
J. Sousa ◽  
D. Savić
Keyword(s):  
Water Supply ◽  
Robust Optimization ◽  
Optimization Problems ◽  
Systems Design ◽  
Well Being ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Water Mains ◽  
Hydraulic Simulator ◽  
Supply Systems

Abstract. Water supply systems (WSSs) are vital infrastructures for the well-being of people today. To achieve good customer satisfaction the water supply service must always be able to meet people's needs, in terms of both quantity and quality. But unpredictable extreme conditions can cause severe damage to WSSs and lead to poorer levels of service or even to their failure. Operators dealing with a system's day-to-day operation know that events like burst water mains can compromise the functioning of all or part of a system. To increase a system's reliability, therefore, designs should take into account operating conditions other than normal ones. Recent methods based on robust optimization can be used to solve optimization problems which involve uncertainty and can find designs which are able to cope with a range of operating conditions. This paper presents a robust optimization model for the optimal design of water supply systems operating under different circumstances. The method presented here uses a hydraulic simulator linked to an optimizer based on a simulated annealing heuristic. The results show that robustness can be included in several ways for varying levels reliability and that it leads to more reliable designs for only small cost increases.

scholarly journals Improving of the quality and reliability of water supply systems on the basis of modern information and computing technologies

2018 ◽  
Vol 39 ◽  
pp. 04003 ◽  
Author(s):  
Aleksandr V. Alekseev
Keyword(s):  
Water Supply ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Mode Analysis ◽  
Water Supply Systems ◽  
Common Information ◽  
Quality Of Water ◽  
Common Information Space ◽  
Hydraulic Conditions ◽  
Supply Systems

The article deals with the issues of increasing the reliability and quality of water supply systems operation on the basis of modern methods and software complexes for the analysis and development of hydraulic conditions. Against the backdrop of the analysis of the literature on the problem of reliability, the relevance and insufficiency of attention to maintaining the required level of reliability at the stage of water supply systems operation are revealed. The main factors that affect on operational reliability are considered. These factors are largely associated with the competent organization of operating conditions of water supply systems. A brief description of the «Angara-WS» computer program for solving the problems of analyzing and developing of hydraulic conditions, as well as the experience of its practical application, is given. A special feature of this complex is its universality, the possibility of multilevel representation of models, the execution of one-and multi-level calculations, integration into a common information space of the enterprise, automation of the processes of mode analysis, accumulation and analysis of damage statistics.

Comparative analysis of water–pipe network deterioration–case study

2016 ◽  
Vol 11 (1) ◽  
pp. 148-156 ◽  
Author(s):  
Małgorzata Kutyłowska ◽  
Maria Orłowska-Szostak
Keyword(s):  
Comparative Analysis ◽  
Water Supply ◽  
Weather Conditions ◽  
Technical Condition ◽  
Water Utilities ◽  
Water Supply Systems ◽  
Failure Rates ◽  
Supply Networks ◽  
Water Mains ◽  
Supply Systems

The paper presents a comparative analysis of water-supply network deterioration in three Polish cities. The comparison was made on the basis of operating data (from the period 2007 to 2012) received from water utilities. The comparison is necessary to determine whether and to what extent water utilities should improve the technical condition of their water-supply networks. On average in cities A, B and C, failure rates λ (fail km−1 a−1) of water mains, distribution pipes and house connections were 0.20, 0.24 and 0.53; 0.17, 0.32 and 0.50; and 0.01, 0.48 and 1.63, respectively. The failure rates of the main and distribution conduits were higher in winter than summer, due to the weather conditions and the pipes' shallow depth. Smaller diameter pipes were more vulnerable. One city is exposed to mining exploitation and most cracking observed on the main and distribution pipelines arose from this. As the literature and these investigations indicate, the technical condition of water supply systems in Poland is still improving and rates of deterioration decreasing.

scholarly journals Dimensionless curves of centrifugal pumps for water supply systems: development and case study

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Jóice Cristini Kuritza ◽  
Giovani Camponogara ◽  
Marcelo Giulian Marques ◽  
Daniela Guzzon Sanagiotto ◽  
Cristiane Battiston
Keyword(s):  
Water Supply ◽  
Maximum Yield ◽  
Electricity Consumption ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Centrifugal Pumps ◽  
Water Pumping ◽  
Performance Curves ◽  
Supply Systems

ABSTRACT Centrifugal pumps are widely used in water supply systems and account for more than 90% of the electricity consumption of water pumping stations. Studies that seek to generalize the characterization of performance curves of centrifugal pumps are extremely useful. A study was carried out on the dimensionless characteristics of the operating conditions of centrifugal pumps for preliminary design estimations of water supply systems aiming at energy efficiency. The research consisted of the analysis of performance curves of centrifugal pumps from which data was collected regarding the point of maximum yield (PMY). The curves and the equations obtained were made dimensionless so that the information could be extrapolated to other situations. A case study was conducted in the Water Supply System of Vale Campus of the Federal University of Rio Grande do Sul (UFRGS) to demonstrate the application of those equations and curves developed. The dimensionless equations were useful to determine which discharge should be adopted so that the system would be more efficient hydro and energetically and, also, to determine how much more energy would be consumed in the case of alteration of the point of operation of the pump by a throttling valve.

Performance indicators for small- and medium-sized water supply systems: a review

2014 ◽  
Vol 22 (1) ◽  
pp. 1-40 ◽  
Author(s):  
Husnain Haider ◽  
Rehan Sadiq ◽  
Solomon Tesfamariam
Keyword(s):  
Performance Evaluation ◽  
Water Supply ◽  
Performance Indicators ◽  
Evaluation System ◽  
Minimum Cost ◽  
Evaluation Process ◽  
Primary Objective ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Supply Systems

Water supply systems (WSSs) are one of the most important and expensive core public infrastructures. The primary objective of a water supply utility is to have this valuable asset operate at its maximum possible efficiency with minimum cost throughout its design period. To achieve this objective, the first step is to evaluate the existing efficiency of all the components of the WSS using suitable performance indicators (PIs). Various agencies and organizations worldwide have developed detailed performance evaluation frameworks including several indicators to comprehensively cover all the aspects (e.g., physical asset, staffing, operational, customer satisfaction, economical) of the WSSs. Most of these frameworks and indicators have been developed for large-sized WSSs. Small- and medium-sized water supply systems (SM-WSSs) have specific performance-related issues, ranging from difficulties in collecting the data required to use the available systems of PIs to lack of skilled personnel and financial resources for efficient operations. A comprehensive review of the literature has been carried out to assess the suitability of reported performance evaluation systems for SM-WSSs in terms of their simplicity (easy and simple data requirements) and comprehensiveness (i.e., all the components of a WSS). This review also evaluates the individual PI with respect to its understandability, measurability, and comparability (i.e., within and across utility comparisons). On the basis of this detailed review, a conceptual performance evaluation system for SM-WSSs, consisting of a list of PIs grouped into their respective categories, has been proposed. The proposed system provides a stepwise approach, starting the performance evaluation process with the most significant and easy to measure PIs for small-sized WSSs and moving to a relatively complex set of indicators for SM-WSS depending on the availability of resources and specific operating conditions.

scholarly journals Process of hydraulic models calibration

2018 ◽  
Vol 59 ◽  
pp. 00007
Author(s):  
Izabela Zimoch ◽  
Ewelina Bartkiewicz
Keyword(s):  
Water Supply ◽  
Distribution System ◽  
Water Distribution ◽  
Interdisciplinary Approach ◽  
Operating Conditions ◽  
Roughness Coefficient ◽  
Water Supply Systems ◽  
Model Parameters ◽  
Network Graph ◽  
Supply Systems

Mathematical modelling of the water supply systems (WSS) and water quality changes in the system is a complex and difficult task to solve, it requires an interdisciplinary approach to considering the determinants of WSS work. Prognosis models of the WSS in relation to hydraulic quantities are well known and there are many packages that implement these models. These packages allow you to calculate the flow and pressure in the water distribution system under certain operating conditions. However, to make a hydraulic model a useful tool in the management of water supply systems, a calibration process is required. This process involves estimating model parameters to minimize the difference between model results and actual observations. This is a complex and multi-stage process where the network graph and parameters such as roughness coefficient, pump characteristics, or nodal demands are checked and corrected. The following work contains a complex process of calibration of the actual WSS that supplies water to the customers of the selected part of the Silesian agglomeration.

Optimization of the energy management in water supply systems

2009 ◽  
Vol 9 (1) ◽  
pp. 59-65 ◽  
Author(s):  
F. Vieira ◽  
H. M. Ramos
Keyword(s):  
Water Supply ◽  
Hydraulic System ◽  
High Energy ◽  
Water Supply Systems ◽  
Time Step ◽  
Water Turbine ◽  
Pumping Schedules ◽  
Definition Of ◽  
Hydraulic Simulator ◽  
Supply Systems

Water supply systems frequently present high-energy consumption, which correspond to the major expenses of these systems. Energy costs are a function of real consumption and the daily energy tariff. This paper presents a model of optimization to guarantee the delivery of enough water to populations, for each day. Although, in order to achieve that, energy for pumping is needed, representing the main cost for the companies that operate the systems. The model, developed in MATLAB®, provides the best solution to take in each time step. Simultaneously the population water consumption must be guaranteed, and the hydraulic system restrictions fulfilled. The definition of optimal pumping schedules allows the reduction of operation and maintenance costs associated with pumping energy, as well as the increase of global hydraulic system efficiency. The rules are subsequently introduced into a hydraulic simulator (EPANET), to verify the system behaviour along the simulation period. In addiction, a water turbine is introduced in one of the system's branches. The economical benefits from the generated energy from the water turbine can not be neglected and the wind complementary turbine for pumping supply provides also significant economical savings.

scholarly journals PRELIMINARY TECHNICAL ASSESSMENT OF WATER DISTRIBUTION NETWORKS

2015 ◽  
Vol 1 (2) ◽  
pp. 129-134
Author(s):  
Ladislav Tuhovčák ◽  
Miloslav Tauš ◽  
Tomáš Sucháček
Keyword(s):  
Water Supply ◽  
Water Distribution ◽  
Distribution Networks ◽  
Technical Condition ◽  
Water Supply Systems ◽  
Software Application ◽  
Investment Projects ◽  
Starting Point ◽  
Water Mains ◽  
Supply Systems

The knowledge of the current technical condition of the operated system is in the interest of the owner or operator of public water supply systems. Such information is the starting point when making decisions on investment projects or planning water mains renewal. The submitted paper introduces the methodology of preliminary assessment of the technical condition of water supply systems and outputs of the software application TEA Water, which makes it possible to assess the technical condition of the specific elements of the water supply systems and clear displaying with the presentation of the assessment results for the entire considered water supply system.

scholarly journals Development of approaches for ecologization of water supply in the city

2021 ◽  
Vol 937 (3) ◽  
pp. 032025
Author(s):  
A Zheltenkov ◽  
E Vasilyeva ◽  
O Syuzeva
Keyword(s):  
Water Supply ◽  
Russian Federation ◽  
Economic Efficiency ◽  
Negative Impact ◽  
Operating Conditions ◽  
Water Supply Systems ◽  
Innovative Materials ◽  
The Russian Federation ◽  
Supply Systems ◽  
The City

Abstract The objective of this research is to develop recommendations on ecologization of water supply in the city. The authors revealed the main problems, peculiar to intercity systems of water supply and having negative impact on the environment. The negative environmental impacts of water supply problems were systematized. The priority directions of the solution of the matter of ecologization of water supply in the cities were defined. The main of these directions, i.e. the choice of innovative materials for the water supply systems, their advantages and advantages of modern pipes in various specified operating conditions was considered as a debatable question. The results of the conducted research can promote the ecologization of water supply in the cities of the Russian Federation. Some offers on water supply improvement, as well as the reasons expressed as the discussion can be useful during planning repair and replacement of water supply systems, choosing materials and technologies, during justification of ecological-and-economic efficiency of improvements.

scholarly journals On the efficiency of the control of the circulation of hot water

2021 ◽  
Vol 22 (6) ◽  
pp. 117-129
Author(s):  
P. V. Rotov ◽  
A. A. Sivukhin ◽  
M. A. Rotova ◽  
R. A. Gafurov ◽  
A. V. Gorshkov
Keyword(s):  
Water Supply ◽  
Flow Control ◽  
Residential Buildings ◽  
Operating Conditions ◽  
Hot Water ◽  
Heat Consumption ◽  
Load Control ◽  
Water Supply Systems ◽  
Hot Water Supply ◽  
Supply Systems

PURPOSE. Perform analysis of the actual heat energy consumption for cold water heating for the hot water utility to the approved standard. Compare different methods of flow control in circulation pipelines of hot water supply systems. Identify ways to improve the efficiency of hot water systems. METHODS. The passive engineering experiment was used to study the operating modes of hot water supply systems of several groups of houses, in which various methods of regulating water consumption in hot water supply systems are implemented. Data collection was carried out using the online system of control and commercial accounting of energy resources. RESULTS. Existing hot water supply systems in residential buildings of Ulyanovsk were inspected under various methods of flow control in circulation pipelines. Features of static and dynamic load control of hot water supply systems were investigated. Analysis of influence of methods of control of thermal load of hot water supply systems on their actual heat consumption was performed. The possibility of bringing the actual operation mode of hot water supply systems to the standard value, on the basis of which consumption is calculated, is estimated. CONCLUSION. Known methods of load control in hot water supply systems and their actual operating conditions do not allow to reach the level of heat consumption that meets the established standards. Conclusions were drawn on the need to revise the regulated indicators of hot water quality and to adjust the method of calculating consumption in hot water supply systems.

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