The Experts below are selected from a list of 5232 Experts worldwide ranked by ideXlab platform
S. Chen - One of the best experts on this subject based on the ideXlab platform.
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Computer‐Aided Optimal Pump Selection for Water Distribution Networks
Journal of Water Resources Planning and Management, 1993Co-Authors: B. Ulanicki, J. P. Rance, D. Davis, S. ChenAbstract:The paper addresses the selection of new pumps as part of a major redevelopment of a large scale urban water-distribution system in which the locations of existing and planned pumping stations are already established. The methodology provides for the selection of pump options that are hydraulically feasible in terms of Service-Reservoir operation and consumer-supply pressures, and optimal in terms of total network pump-power consumption. The approach relies on a formal analysis of the results of a series of simulations performed at time instants representative of an operational horizon. The selection procedure involves pressure screening, least costing, and Reservoir balancing stages at which control configurations that do not meet specified design criteria are rejected. The pumps that participate in the final stage are selected for the network. The methodology provides a global model of the water-network behavior over the whole range of operational conditions that can be used to solve other problems, such as on-line operational control. The methodology was successfully applied to part of London’s water system.
George Kastl - One of the best experts on this subject based on the ideXlab platform.
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Effects of stratification on chloramine decay in distribution system Service Reservoirs
Water research, 2008Co-Authors: Ian Fisher, Arumugam Sathasivan, Paul Y Chuo, George KastlAbstract:Water quality in chloraminated distribution systems is affected by microbial activity, particularly due to nitrifiers that accelerate chloramine decay. In summer, continuous thermal stratification increases retention time and lowers chloramine residual in some parts of a system Service Reservoir (tank), relative to fully mixed conditions. According to temperature and chemical indicators, cooling in winter destratifies these Reservoirs naturally. Traditional (chemical) indicators of nitrification also suggest that destratification occurs with respect to microbiological activity. In contrast, the microbial decay factor (Fm) method, which separates microbiological and chemical decay in bulk water, identifies strong microbial stratification, even in winter. Fm can also be used to predict the exacerbated loss of chloramine residual in the following summer, which enables early intervention by system managers to minimise such loss, and so maintain an adequate residual through the distribution system.
Jure Margeta - One of the best experts on this subject based on the ideXlab platform.
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The Impact of the Water Consumption Regime on the Work of Reservoirs
2015Co-Authors: Bojan Đurin, Jure Margeta, Davor BojanićAbstract:Reservoirs in water supply systems have technological, energetic and security functions which are very important for the overall sustainability of water supply. The change in water consumption regime and/or flow of water into the Reservoir affects the water balance in the Service Reservoir and water pressure in the water supply network. This paper analyzes the changes that occurred in the water consumption regime in Croatia and their effect on the water supply system and its sustainability. It has been found that the changes are significant as well as impacts on energy use, water losses and reliability of water supply. Based on the analysis, the functional dependencies between the key input variables and the operation of the system have been defined and recommendations given for practice.
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Analysis of the Possible Use of Solar Photovoltaic Energy in Urban Water Supply Systems
Water, 2014Co-Authors: Bojan Đurin, Jure MargetaAbstract:Because of the importance of water supply for the sustainability of urban areas, and due to the significant consumption of energy with prices increasing every day, an alternative solution for sustainable energy supply should be sought in the field of Renewable Energy Sources (RES). An innovative solution as presented in this paper has until now not been comprehensively analyzed. This work presents the solution with the application of a (Photovoltaic) PV generator. The main technological features, in addition to the designing methodology and case study are presented in this paper. The critical period approach has been used for the first time for system sizing. The application of this sizing method provides a high reliability of the proposed system. The obtained results confirm the assumption that the PV generator is a promising energy sustainable solution for urban water supply systems. The Service Reservoir, which acts as water and energy storage for the proposed system, provides the basis for a sustainable solution of water and energy supply. In accordance with the proposed, the reliability of such system is high. This concept of energy supply operation does not generate any atmospheric emission of greenhouse gases, which contributes significantly to the reduction of the impacts of climate changes. The proposed solution and designing methodology are widely applicable and in accordance with the characteristics of the water supply system and climate.
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Concept of green energy supply for urban water system
2012Co-Authors: Bojan Đurin, Jure MargetaAbstract:This paper describes the application of a renewable energy sources for urban water supply. Proposed concept is based on the clean and renewable energy sources, as it is solar energy. Operation of the system is based on solar energy which is free and widely available. In this paper, solar photovoltaic systems have been applied for green electric energy production. Due to the importance of water supply for urban area sustainability, and due to a significant energy consumer whose price is increasing each day, alternative solution to power systems are sought in the form of water supply systems, such as a PV generator. It is a system, whose functioning is defined by a range of factors such as: climate, soil, hydrological data, water demand etc. It has to be analyzed and optimized with the application of a systematic approach. In this paper we will present basic characteristics of the system consist of PV array, pump station and water supply Service Reservoir and main hydraulic and energy relationship between his elements. The methodology for the system analysis and design as well as economical factors will be also presented.
B. Ulanicki - One of the best experts on this subject based on the ideXlab platform.
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Computer‐Aided Optimal Pump Selection for Water Distribution Networks
Journal of Water Resources Planning and Management, 1993Co-Authors: B. Ulanicki, J. P. Rance, D. Davis, S. ChenAbstract:The paper addresses the selection of new pumps as part of a major redevelopment of a large scale urban water-distribution system in which the locations of existing and planned pumping stations are already established. The methodology provides for the selection of pump options that are hydraulically feasible in terms of Service-Reservoir operation and consumer-supply pressures, and optimal in terms of total network pump-power consumption. The approach relies on a formal analysis of the results of a series of simulations performed at time instants representative of an operational horizon. The selection procedure involves pressure screening, least costing, and Reservoir balancing stages at which control configurations that do not meet specified design criteria are rejected. The pumps that participate in the final stage are selected for the network. The methodology provides a global model of the water-network behavior over the whole range of operational conditions that can be used to solve other problems, such as on-line operational control. The methodology was successfully applied to part of London’s water system.
Ian Fisher - One of the best experts on this subject based on the ideXlab platform.
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Effects of stratification on chloramine decay in distribution system Service Reservoirs
Water research, 2008Co-Authors: Ian Fisher, Arumugam Sathasivan, Paul Y Chuo, George KastlAbstract:Water quality in chloraminated distribution systems is affected by microbial activity, particularly due to nitrifiers that accelerate chloramine decay. In summer, continuous thermal stratification increases retention time and lowers chloramine residual in some parts of a system Service Reservoir (tank), relative to fully mixed conditions. According to temperature and chemical indicators, cooling in winter destratifies these Reservoirs naturally. Traditional (chemical) indicators of nitrification also suggest that destratification occurs with respect to microbiological activity. In contrast, the microbial decay factor (Fm) method, which separates microbiological and chemical decay in bulk water, identifies strong microbial stratification, even in winter. Fm can also be used to predict the exacerbated loss of chloramine residual in the following summer, which enables early intervention by system managers to minimise such loss, and so maintain an adequate residual through the distribution system.