Analysis of the use of variable speed drives in water supply systems
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/31361 |
Resumo: | Currently, operational control at the pumping stations is based on the water levels present in the tanks, ie, each time the water level reaches a certain minimum value, the pumps switch on until the tank is full again. Although this type of control is quite effective, it is also quite inefficient. This type of operation can be largely optimized by adjusting pumping operations to energy prices that vary throughout the day. Additionally, the use of variable speed drives can also increase the efficiency of the pumps due to its adaptations to daily water consumption. However, this type of operation imposes several challenges such as (i) the high difficulty of the operator to accurately predict water consumption patterns every day and for all types of consumers by intuition ; (ii) associate water needs with fluctuations in energy tariffs and with low storage capacity of reservoirs; (iii) know the ideal frequency to pump the water with the lowest energy consumption and (iv) know the equipment used, which, over time, its efficiency decreases substantially. With complex and large systems (such as water supply systems), the attempt to improve operational efficiency can be a "shot in the dark", which can lead to serious implications on the minimum requirements required by final consumers (such as pressures or security of supply). In this thematic area, the goal of this work is to contribute to an increase in the efficiency of these systems. Different studies results are described in the literature, studies concerning the application of VSDs. However, even though they show good results when it comes to energy savings, there is still doubt among the community on the advantages of applying the VSDs, and above all there is still a lack of information on how to use the VSDs. The main goal of this study is to present the benefits of using VSDs, as well as explaining its application. Python simulations were developed with different scenarios for a water distribution network, using VSDs and pumps, even at parallel use. The results achieved were satisfactory and present values of energy savings within expectations. |
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Analysis of the use of variable speed drives in water supply systemsVariable speed drivesCentrifugal pumpIncreasing efficiencyAffinity lawsHydraulic modellingCurrently, operational control at the pumping stations is based on the water levels present in the tanks, ie, each time the water level reaches a certain minimum value, the pumps switch on until the tank is full again. Although this type of control is quite effective, it is also quite inefficient. This type of operation can be largely optimized by adjusting pumping operations to energy prices that vary throughout the day. Additionally, the use of variable speed drives can also increase the efficiency of the pumps due to its adaptations to daily water consumption. However, this type of operation imposes several challenges such as (i) the high difficulty of the operator to accurately predict water consumption patterns every day and for all types of consumers by intuition ; (ii) associate water needs with fluctuations in energy tariffs and with low storage capacity of reservoirs; (iii) know the ideal frequency to pump the water with the lowest energy consumption and (iv) know the equipment used, which, over time, its efficiency decreases substantially. With complex and large systems (such as water supply systems), the attempt to improve operational efficiency can be a "shot in the dark", which can lead to serious implications on the minimum requirements required by final consumers (such as pressures or security of supply). In this thematic area, the goal of this work is to contribute to an increase in the efficiency of these systems. Different studies results are described in the literature, studies concerning the application of VSDs. However, even though they show good results when it comes to energy savings, there is still doubt among the community on the advantages of applying the VSDs, and above all there is still a lack of information on how to use the VSDs. The main goal of this study is to present the benefits of using VSDs, as well as explaining its application. Python simulations were developed with different scenarios for a water distribution network, using VSDs and pumps, even at parallel use. The results achieved were satisfactory and present values of energy savings within expectations.Atualmente, o controlo operacional nas estações elevatórias de àgua é feito com base nos níveis de àgua presentes nos reservatório, ou seja, cada vez que o nível da àgua atinge um determinado valor mínimo, as bombas são ligadas até o reservatório ficar cheio novamente. Embora este tipo de controlo seja bastante eficaz, também é bastante ineficiente. Este tipo de operação pode ser amplamente otimizado ajustando as operações de bombeamento aos preços de energia que variam ao longo do dia. Além disso, a utilização de variadores de velocidade também pode aumentar a eficiência das bombas devido às suas adaptações ao consumo diário de àgua. No entanto, este tipo de operação impõe vários desafios, como (i) a grande dificuldade do operador em prever com precisão os padrões de consumo de àgua todos os dias e para todos os tipos de consumidores por intuição; (ii) associar as necessidades de água às flutuações das tarifas de energia e à baixa capacidade de armazenamento dos reservatórios; (iii) saber a frequência ideal para bombear a água com menor consumo de energia e (iv) conhecer os equipamentos utilizados, que, com o tempo, a sua eficiência diminui substancialmente. Com sistemas complexos e grandes (como sistemas de abastecimento de àgua), a tentativa de melhorar a eficiência operacional pode ser um "tiro no escuro", o que pode levar a sérias implicações nos requisitos mínimos exigidos pelos consumidores finais (como pressão ou segurança no fornecimento). Nesta área temática, o objetivo deste trabalho é contribuir para o aumento da eficiência destes sistemas. Resultados de diversos estudos são descritos na literatura, estudos relativos à aplicação de VSDs. Porém, embora apresentem bons resultados no que se refere à economia de energia, ainda há dúvidas na comunidade sobre as vantagens da aplicação dos VSDs e, sobretudo, ainda falta informação sobre como utilizar os VSDs. O objetivo principal deste estudo é então apresentar os benefícios da utilização de VSDs, bem como explicar a sua aplicação. Simulações em Python foram desenvolvidas com diferentes cenários para uma rede de distribuição de água, usando VSDs e bombas hidráulicas, até com utilização em paralelo. Os resultados alcançados foram satisfatórios e apresentam valores de poupança de energia dentro das expectativas2021-05-13T09:22:03Z2021-02-25T00:00:00Z2021-02-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/31361engNunes, Pedro Daniel da Cunha Moreirainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:00:33Zoai:ria.ua.pt:10773/31361Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:03:16.073815Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Analysis of the use of variable speed drives in water supply systems |
title |
Analysis of the use of variable speed drives in water supply systems |
spellingShingle |
Analysis of the use of variable speed drives in water supply systems Nunes, Pedro Daniel da Cunha Moreira Variable speed drives Centrifugal pump Increasing efficiency Affinity laws Hydraulic modelling |
title_short |
Analysis of the use of variable speed drives in water supply systems |
title_full |
Analysis of the use of variable speed drives in water supply systems |
title_fullStr |
Analysis of the use of variable speed drives in water supply systems |
title_full_unstemmed |
Analysis of the use of variable speed drives in water supply systems |
title_sort |
Analysis of the use of variable speed drives in water supply systems |
author |
Nunes, Pedro Daniel da Cunha Moreira |
author_facet |
Nunes, Pedro Daniel da Cunha Moreira |
author_role |
author |
dc.contributor.author.fl_str_mv |
Nunes, Pedro Daniel da Cunha Moreira |
dc.subject.por.fl_str_mv |
Variable speed drives Centrifugal pump Increasing efficiency Affinity laws Hydraulic modelling |
topic |
Variable speed drives Centrifugal pump Increasing efficiency Affinity laws Hydraulic modelling |
description |
Currently, operational control at the pumping stations is based on the water levels present in the tanks, ie, each time the water level reaches a certain minimum value, the pumps switch on until the tank is full again. Although this type of control is quite effective, it is also quite inefficient. This type of operation can be largely optimized by adjusting pumping operations to energy prices that vary throughout the day. Additionally, the use of variable speed drives can also increase the efficiency of the pumps due to its adaptations to daily water consumption. However, this type of operation imposes several challenges such as (i) the high difficulty of the operator to accurately predict water consumption patterns every day and for all types of consumers by intuition ; (ii) associate water needs with fluctuations in energy tariffs and with low storage capacity of reservoirs; (iii) know the ideal frequency to pump the water with the lowest energy consumption and (iv) know the equipment used, which, over time, its efficiency decreases substantially. With complex and large systems (such as water supply systems), the attempt to improve operational efficiency can be a "shot in the dark", which can lead to serious implications on the minimum requirements required by final consumers (such as pressures or security of supply). In this thematic area, the goal of this work is to contribute to an increase in the efficiency of these systems. Different studies results are described in the literature, studies concerning the application of VSDs. However, even though they show good results when it comes to energy savings, there is still doubt among the community on the advantages of applying the VSDs, and above all there is still a lack of information on how to use the VSDs. The main goal of this study is to present the benefits of using VSDs, as well as explaining its application. Python simulations were developed with different scenarios for a water distribution network, using VSDs and pumps, even at parallel use. The results achieved were satisfactory and present values of energy savings within expectations. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-05-13T09:22:03Z 2021-02-25T00:00:00Z 2021-02-25 |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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http://hdl.handle.net/10773/31361 |
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eng |
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