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Browsing by Author "Ramos, Helena M."

Now showing items 1-20 of 23

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 ...
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 ...
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 ...
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 ...
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 ...
Optimal energy efficiency of isolated PAT systems by SEIG excitation tuning

Fernandes, João F.P.; Pérez-Sánchez, Modesto; Ferreira, F.; López Jiménez, Petra Amparo; Ramos, Helena M.; Costa Branco, P.J. (Elsevier, 2019)

[EN] The use of pump working as turbine (PAT) was identified by many researchers as a way to improve the energy efficiency in the water systems. However, the majority of the researches consider the hydraulic machine connected ...
Optimization Strategy for Improving the Energy Efficiency of Irrigation Systems by Micro Hydropower: Practical Application

Pérez-Sánchez, Modesto; Sánchez-Romero, Francisco-Javier; Ramos, Helena M.; López Jiménez, Petra Amparo (MDPI AG, 2017)

[EN] Analyses of possible synergies between energy recovery and water management are essential for achieving sustainable advances in the performance of pressurized irrigation networks. Nowadays, the use of micro hydropower ...
Pathogen Intrusion flows in WDS: according to orifice equations

Mora Rodríguez, José de Jesús; Delgado Galván, Xitlali Virginia; Ortiz-Medel, Joaquina; Ramos, Helena M.; Fuertes-Miquel, Vicente S.; López Jiménez, Petra Amparo (IWA Publishing, 2015)

[EN] Pathogen intrusion may occur in water pipes when negative pressures allow external flows to enter through failures or leaks and then mix with safe water. It is applied a variation of the Fixed and Variable Area Discharge ...
PATs Operating in Water Networks under Unsteady Flow Conditions: Control Valve Manoeuvre and Overspeed Effect

Pérez-Sánchez, Modesto; López Jiménez, Petra Amparo; Ramos, Helena M. (MDPI AG, 2018-04)

[EN] The knowledge of transient conditions in water pressurized networks equipped with pump as turbines (PATs) is of the utmost importance and necessary for the design and correct implementation of these new renewable ...
PATs selection towards sustainability in irrigation networks: Simulated annealing as a water management tool

Pérez-Sánchez, Modesto; Sánchez-Romero, Francisco-Javier; López Jiménez, Petra Amparo; Ramos, Helena M. (Elsevier, 2018-02)

[EN] Irrigation networks involve many water and energy aspects, in which the sustainability plays a paramount role. Nowadays, water tariff in irrigation networks represents a high percentage within of farmers' costs, ...
Smart Water Management towards Future Water Sustainable Networks

Ramos, Helena M.; McNabola, A.; López Jiménez, Petra Amparo; Pérez-Sánchez, Modesto (MDPI AG, 2020)

[EN] Water management towards smart cities is an issue increasingly appreciated under financial and environmental sustainability focus in any water sector. The main objective of this research is to disclose the technological ...
Subatmospheric pressure in a water draining pipeline with an air pocket

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

[EN] An air pocket's behaviour inside of a pipeline during transient conditions is of great importance due to its effect on the safety of the hydraulic system and the complexity of modeling its behaviour. The emptying ...