scholarly journals Speed factors computed for pumping schedules in Water Distribution Networks: DDA versus PDA formulations

2019 ◽  
Vol 85 ◽  
pp. 06002
Author(s):  
Remus Alexandru Mădulărea ◽  
Petre-Ovidiu Ciuc ◽  
Andrei-Mugur Georgescu ◽  
Sanda-Carmen Georgescu
Keyword(s):  
Water Distribution ◽  
Cost Savings ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Test Case ◽  
System Of Equations ◽  
Balance Equations ◽  
Nonlinear System Of Equations ◽  
Pumping Schedules ◽  
Pressure Driven Analysis

This paper focuses on a methodology allowing to derive the pumping schedule in Water Distribution Networks (WDN), upon a time dependent water demand. The selected test case is a previously studied WDN. Two pumping algorithms give different pumping rules. By solving the nonlinear system of equations, consisting of energy balance equations, mass balance equations and pumping rules, one gets the pumps speed factors. Solutions attached to the Pressure Driven Analysis (PDA) correspond to energy and cost savings, with respect to the solutions given by the Demand Driven Analysis (DDA). The methodology described in this paper is simple and rapid, but the iterative numerical method used to solve the system of equations is highly dependent on the starting guess.

New indices for reliability assessment of water distribution networks

2016 ◽  
Vol 65 (5) ◽  
pp. 384-395 ◽  
Author(s):  
Akbar Shirzad ◽  
Massoud Tabesh
Keyword(s):  
Water Distribution ◽  
Network Reliability ◽  
Unit Length ◽  
Reliability Assessment ◽  
Weighted Average ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Main Factors ◽  
Pressure Driven Analysis ◽  
Demand Driven Analysis

This paper presents new indices to evaluate the reliability of water distribution networks (WDNs) usable in the design, planning and management of these networks. Since the pressure-driven analysis (PDA) of WDNs produces more accurate results than the demand-driven analysis, the new indices are proposed based on the PDA. In the proposed measures, nodal pressures, nodal available discharges and the energy loss per unit length of pipes are considered as the main factors influencing the reliability of WDNs. The introduced network reliability index is a combination of two indices named total nodal reliability and total pipe reliability. These indices are equal to the weighted average of all of the nodal and pipe reliabilities, respectively. A sample network is used to evaluate the new proposed index and some of the available indices and to compare their efficiencies in assessing the reliability of WDNs. The results show that the new proposed index is more efficient and outperforms the others. The introduced index is normalized and is independent of the WDN size. This index considers the qualitative aspects of WDNs besides the hydraulic aspects in evaluating reliability.

Technique for the Pressure-Driven Analysis of Water Distribution Networks with Flow- and Pressure-Regulating Valves

2021 ◽  
Vol 147 (5) ◽  
pp. 06021005
Author(s):  
Nikolai B. Gorev ◽  
Vyacheslav N. Gorev ◽  
Inna F. Kodzhespirova ◽  
Igor A. Shedlovsky ◽  
P. Sivakumar
Keyword(s):  
Water Distribution ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Pressure Driven Analysis ◽  
Pressure Driven

scholarly journals Development of a Binary Model for Evaluating Water Distribution Systems by a Pressure Driven Analysis (PDA) Approach

2020 ◽  
Vol 10 (9) ◽  
pp. 3029 ◽  
Author(s):  
Attilio Fiorini Morosini ◽  
Sina Shaffiee Haghshenas ◽  
Sami Shaffiee Haghshenas ◽  
Zong Woo Geem
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Classification Model ◽  
Group Method ◽  
Binary Model ◽  
Pressure Driven Analysis ◽  
Pressure Driven

Investigation of Water Distribution Networks (WDNs) is considered a challenging task due to the unpredicted and uncertain conditions in water engineering. When in a WDN, a pipe failure occurs, and shut-off valves to isolate the broken pipe to allow repairing works are activated. In these new conditions, the hydraulic parameters in the network are modified because the topology of the entire system changes. If the head becomes inadequate, the Pressure Driven Analysis (PDA) is the correct approach to evaluate the performance of water networks. Hence, in the present study, the water distribution system was evaluated in pressure-driven conditions for 100 different scenarios and then using a type of neural network called Group Method of Data Handling (GMDH) as a stochastic technique. For this purpose, several most notable parameters including the base demand, pressure, and alpha (the percentage of effective supplied flow) were calculated using simulations based on a PDA approach and applied to the water distribution network of Praia a Mare in Southern Italy. In the second stage, the output parameters were used in a developed binary classification model. Finally, the obtained results showed that the GMDH algorithm can be applied as a powerful tool for modeling water distribution networks.

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