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Browsing by Author "Ramos, Helena M."

Now showing items 1-20 of 33

An overview of leaks and intrusion for different pipe materials and failures

Mora Rodríguez, José de Jesús; Delgado Galván, Xitlali Virginia; Ramos, Helena M.; López Jiménez, Petra Amparo (Taylor & Francis, 2014-01-02)

Most leak management methods are focused on quantifying water losses, directly related to energy and resource waste. In this research work, a comprehensive review on relationship and modelling between pipe leaks, materials, ...
Backflow air and pressure analysis in emptying a pipeline containing an entrapped air pocket

Besharat, Mohsen; Coronado-Hernández, Oscar Enrique; Fuertes-Miquel, Vicente S.; Viseu, Maria Teresa; Ramos, Helena M. (Taylor & Francis, 2018-11-14)

[EN] The prediction of the pressure inside the air pocket in water pipelines has been the topic for a lot of research works. Several aspects in this field have been discussed, such as the filling and the emptying procedures. ...
Bombas operando como turbinas (PAT). Principios de funcionamiento y selección

Pérez Sánchez, Modesto; Sánchez Romero, Francisco Javier; López Jiménez, Petra Amparo; Ramos, Helena M. (Editorial Universitat Politècnica de València, 2020-09-04)

La mejora de la gestión en los sistemas de distribución implica el desarrollo de estrategias y aplicación de tecnologías que permitan aumentar la sostenibilidad de los mismos, mediante el incremento de la eficiencia ...
Calibrating a flow model in an irrigation network: Case study in Alicante, Spain

Pérez-Sánchez, Modesto; Sánchez-Romero, Francisco-Javier; Ramos, Helena M.; López Jiménez, Petra Amparo (Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria, 2017)

[EN] The usefulness of models depends on their validation in a calibration process, ensuring that simulated flows and pressure values in any line are really occurring and, therefore, becoming a powerful decision tool for ...
Caracterização do comportamento de bombas a funcionar como turbinas: análise numérica e experimental

Ramos, Helena M.; Simão, Mariana; Pérez-Sánchez, Modesto; Fernandes, João F.P.; Costa Branco, Paulo J.; López Jiménez, Petra Amparo (Associação Portuguesa de Engenharia Sanitária e Ambiental (APESB), 2020)

[PT] A crescente crise energética e o consumo excessivo de recursos levantam a preocupação de encontrar novas fontes alternativas de energia, viabilizando novos métodos de produção e/ou tornando mais eficientes os que já ...
CFD Analyses and Experiments in a PAT Modeling: Pressure Variation and System Efficiency

Pérez-Sánchez, Modesto; Simao, Mariana; López Jiménez, Petra Amparo; Ramos, Helena M. (MDPI AG, 2017)

[EN] Analysis of a PAT modeling is presented for application in water pipe systems as an interesting and promising energy converter to improve the system energy efficiency. The study is focused on the use of a Computational ...
Computational fluid dynamics for sub-atmospheric pressure analysis in pipe drainage

Besharat, Mohsen; Coronado-Hernández, Oscar Enrique; Fuertes-Miquel, Vicente S.; Viseu, Maria Teresa; Ramos, Helena M. (Taylor & Francis, 2019-08-06)

[EN] The occurrence of sub-atmospheric pressure in the drainage of pipelines containing an air pocket has been known as a major cause of several serious problems. Accordingly, some system malfunction and pipe buckling ...
Design strategy to maximize recovery energy towards smart water grids: case study

Pérez-Sánchez, Modesto; Ferreira, A.R.; López Jiménez, Petra Amparo; Ramos, Helena M. (Taylor & Francis, 2018)

[EN] Water distribution networks (WDNs) appear as a new opportunity to generate clean energy using pumps working as turbines (PATs) instead of pressure reduction valves (PRVs). This research presents a strategy for maximizing ...
Effect of a commercial air valve on the rapid filling of a single pipeline: a numerical and experimental analysis

Coronado-Hernández, Oscar E.; Besharat, Mohsen; Fuertes-Miquel, Vicente S.; Ramos, Helena M. (MDPI AG, 2019-08-31)

[EN] The filling process in water pipelines produces pressure surges caused by the compression of air pockets. In this sense, air valves should be appropriately designed to expel sufficient air to avoid pipeline failure. ...
Effect of the Non-Stationarity of Rainfall Events on the Design of Hydraulic Structures for Runoff Management and Its Applications to a Case Study at Gordo Creek Watershed in Cartagena de Indias, Colombia

Gonzalez-Alvarez, Alvaro; Coronado-Hernández, Oscar Enrique; Fuertes-Miquel, Vicente S.; Ramos, Helena M. (MDPI AG, 2018)

[EN] The 24-h maximum rainfall (P24h-max) observations recorded at the synoptic weather station of Rafael Núñez airport (Cartagena de Indias, Colombia) were analyzed, and a linear increasing trend over time was identified. ...
Electrical behaviour of the pump working as turbine in off grid operation

Capelo, Bernardo; Pérez-Sánchez, Modesto; Fernandes, Joao F. P.; Ramos, Helena M.; López Jiménez, Petra Amparo; Costa Branco, P. J. (Elsevier, 2017-12-15)

[EN] The use of pumps working as turbines (PATs) connected to the electric system, in the replacement of pressure reduction valves to reduce the excessive pressure in water distribution networks, have been studied for the ...
Electro-Hydraulic Transient Regimes in Isolated Pumps Working as Turbines with Self-Excited Induction Generators

Madeira, Filipe C.; Fernandes, Joao F. P.; Pérez-Sánchez, Modesto; López Jiménez, Petra Amparo; Ramos, Helena M.; Costa Branco, P. J. (MDPI AG, 2020-09-01)

[EN] The use of pumps working as turbines (PATs) is a sustainable technical measure that contributes to the improvement of energy efficiency in water systems. However, its performance analysis in off-grid recovery systems ...
Eventos de intrusión patógena en sistemas de distribución de agua potable

Mora Rodríguez, Jesús; Ramos, Helena M.; López Jiménez, Petra Amparo (Instituto Mexicano de Tecnologia del Agua, 2013)

[ES] La intrusión patógena es un fenómeno que se presenta en los sistemas de distribución de agua potable, provocando la disminución de la calidad del agua distribuida cuando los fluidos (contaminados) circundantes a las ...
Experimental and Numerical Analysis of a Water Emptying Pipeline Using Different Air Valves

Coronado-Hernández, Oscar Enrique; Vicente S. Fuertes-Miquel; Besharat, Mohsen; Ramos, Helena M. (MDPI, 2017-02)

The emptying procedure is a common operation that engineers have to face in pipelines. This generates subatmospheric pressure caused by the expansion of air pockets, which can produce the collapse of the system depending ...
Flow Conditions for PATs Operating in Parallel: Experimental and Numerical Analyses

Simao, M; Pérez-Sánchez, Modesto; Carraveta, Armando; Ramos, Helena M. (MDPI AG, 2019)

[EN] Micro-hydro systems can be used as a promising new source of renewable energy generation, requiring a low investment cost of hydraulic, mechanical, and electrical equipment. The improvement of the water management ...
Intrusion problematic during water supply systems' operation

Mora Rodríguez, José de Jesús; López Jiménez, Petra Amparo; Ramos, Helena M. (International Energy and Environment Foundation, 2011)

[EN] Intrusion through leaks occurrence is a phenomenon when external fluid comes into water pipe systems. This phenomenon can cause contamination problems in drinking pipe systems. Hence, this paper focuses on the ...
Management tools for hydro energy interventions in water systems

Frijns, Jos; Cabrera Marcet, Enrique; Carrico, Nelson; Covas, Didia; Monteiro, Antonio J.; Ramos, Helena M.; Bolognesi, Andrea; Bragalli, Cristiana; Baki, Sotiria; Makropoulos, Christos (IWA Publishing, 2015)

[EN] There is significant potential for energy recovery through the use of micro-hydropower installations in water supply systems (WSS). To exploit the full potential of hydro energy in balance with the optimal hydraulic ...
Modeling irrigation networks for the quantification of potential energy recovering: a case study

Pérez-Sánchez, Modesto; Sánchez-Romero, Francisco-Javier; Ramos, Helena M.; López Jiménez, Petra Amparo (MDPI, 2016-06)

Water irrigation systems are required to provide adequate pressure levels in any sort of network. Quite frequently, this requirement is achieved by using pressure reducing valves (PRVs). Nevertheless, the possibility of ...
Modelo numérico del proceso de llenado de una conducción simple con válvula de aire

Coronado-Hernández, Oscar Enrique; Fuertes-Miquel, Vicente S.; Besharat, Mohsen; Ramos, Helena M. (Associacao Portuguesa dos Recursos Hidricos, 2019-12)

[EN] Water filling processes in pipes generate overpressures that must be considered so that the facilities do not fail during their operation. The filling manoeuvres with air trapped in water pipes have been studied by ...
Modified Affinity Laws in Hydraulic Machines towards the Best Efficiency Line

Pérez-Sánchez, Modesto; López Jiménez, Petra Amparo; Ramos, Helena M. (Springer-Verlag, 2018)

[EN] The development of hydraulic and optimization models in water networks analyses to improve the sustainability and efficiency through the installation of micro or pico hydropower is swelling. Hydraulic machines involved ...