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您的检索式：作者名="Helena M.RAMOS"
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| 1 | New design solutions for low-power energy production in water pipe systems显示文摘This study is the result of ongoing research for a European Union 7th Framework Program Project regarding energy converters for very low heads,and aims to analyze optimization of new cost-effective hydraulic turbine designs for possible implementation in water supply systems(WSSs) or in other pressurized water pipe infrastructures,such as irrigation,wastewater,or drainage systems.A new methodology is presented based on a theoretical,technical and economic analysis.Viability studies focused on small power values for different pipe systems were investigated.Detailed analyses of alternative typical volumetric energy converters were conducted on the basis of mathematical and physical fundamentals as well as computational fluid dynamics(CFD) associated with the interaction between the flow conditions and the system operation.Important constraints(e.g.,size,stability,efficiency,and continuous steady flow conditions) can be identified and a search for alternative rotary volumetric converters is being conducted.As promising cost-effective solutions for the coming years,adapted rotor-dynamic turbomachines and non-conventional axial propeller devices were analyzed based on the basic principles of pumps operating as turbines,as well as through an extensive comparison between simulations and experimental tests. | Helena M.RAMOS Alexandre BORGA Mariana SIMO | 2009 | Water Science and Engineering2009，2，4： | 1 |
| 2 | Energy efficiency in a water supply system:Energy consumption and CO_2 emission显示文摘This paper presents important fundamentals associated with water and energy efficiency and highlights the importance of using renewable energy sources.A model of multi-criteria optimization for energy efficiency based on water and environmental management policies,including the preservation of water resources and the control of water pressure and energy consumption through a hybrid energy solution,was developed and applied to a water supply system.The methodology developed includes three solutions:(1) the use of a water turbine in pipe systems where pressures are higher than necessary and pressure-reducing valves are installed,(2) the optimization of pumping operation according to the electricity tariff and water demand,and(3) the use of other renewable energy sources,including a wind turbine,to supply energy to the pumping station,with the remaining energy being sold to the national electric grid.The use of an integrated solution(water and energy) proves to be a valuable input for creating benefits from available hydro energy in the water supply system in order to produce clean power,and the use of a wind source allows for the reduction of energy consumption in pumping stations,as well as of the CO2 emission to the atmosphere. | Helena M.RAMOS Filipe VIEIRA Dídia I.C.COVAS | 2010 | Water Science and Engineering2010，3，3： | 0 |
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