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Energy recuperation in water delivery system
Pavlík, Šimon ; Rudolf, Pavel (referee) ; Himr, Daniel (advisor)
The thesis deals with the use of energy potential in water supply networks and is divided into three main parts. The first part describes the characteristic elements of the water supply network and analyses the energy potential of the Nové Bránice water supply system, which was identified in the location of the pressure reducing valve. The second chapter is devoted to designing algorithm according to which a system of energy recovery - a pump in turbine mode is designed. The statistical analysis is counted as well. In this chapter, the theory of pump in turbine mode operation and the prediction theory of turbine characteristic estimation are presented. The final part of the thesis is devoted to creating a water network model in Epanet 2.2. In one day simulations the current state of the system with a pressure reducing valve is compared with the system including the proposed pump in turbine mode.
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Modification of pump for turbine regime
Jahn, Jan ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
Hydraulic design of a hydrodynamic machine is designed to achieve a high value of energy transformation efficiency. Pumps and turbines have some different typical features in hydraulic design. With the aid of computational fluid dynamics, adjustments of the hydraulic parts of a standard centrifugal pump are assessed with the aim to increase hydraulic efficiency of the pump running as turbine. The impeller, volute casing and added draft tube are discussed.
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CFD simulation of centrifugal pump working as a turbine (PaT) - influence of impeller side wall gaps on simulation results
Tomšej, Radek ; Zemanová, Lucie (referee) ; Štefan, David (advisor)
This master‘s thesis deals with a centrifugal pump running in reverse (turbine) mode, often called “pump-as-turbine”. The introduction lists basic principles and information about the direct (pump) and reverse modes. Several methodologies for predicting reverse operating point and efficiency evolution are used and compared with simulation results. Using CFD simulations, results obtained with simplified (excluding impeller side wall gaps) and complete geometry (including impeller side wall gaps) are assessed. Furthermore, the results of impeller trimming are evaluated with an aim to find the maximum power and efficiency. Impeller side wall gaps effect is analyzed in terms of friction torque and power loss.
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Study of unsteady phenomena in pump as turbine
Hliboký, Samuel ; Zemanová, Lucie (referee) ; Štefan, David (advisor)
This diploma thesis deals with centrifugal pump running as a turbine. Basic working principles of a pump are included, both in pump and turbine regime. Experimental data obtained from laboratory test bed are compared with CFD simulation on slightly simplified geometry. Obtained results are then processed using spectrogram. Influence of time step and mesh size on results is also researched.
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The diagonal pump in turbine regime
Šimunek, Ondřej ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
The thesis is focused on hydraulic design of a semi-axial pump with an axial diffusor with guide vane. The pump is designed with respect to the turbine mode so that it can be used for low-potential energy harvesting or energy storage. The design of the pump is assessed by numerical fluid mechanics using commercial software Ansys CFX.
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Micro power plants for the use of residual gradients and flow
Komorová, Magdaléna ; Dráb, Aleš (referee) ; Žoužela, Michal (advisor)
The aim of the bachelor thesis is to bring information about where hydropower is going in the future in accordance to using residual gradients and flow. Also, bachelor thesis is looking into different types of turbines which can be used for residual gradients and flow, then how government is helping with funding of new and existing hydropower plants. The last part of thesis is analyzing new location for picohydropower plant and bringing three possible designs.
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Energy recuperation in water delivery system
Pavlík, Šimon ; Rudolf, Pavel (referee) ; Himr, Daniel (advisor)
The thesis deals with the use of energy potential in water supply networks and is divided into three main parts. The first part describes the characteristic elements of the water supply network and analyses the energy potential of the Nové Bránice water supply system, which was identified in the location of the pressure reducing valve. The second chapter is devoted to designing algorithm according to which a system of energy recovery - a pump in turbine mode is designed. The statistical analysis is counted as well. In this chapter, the theory of pump in turbine mode operation and the prediction theory of turbine characteristic estimation are presented. The final part of the thesis is devoted to creating a water network model in Epanet 2.2. In one day simulations the current state of the system with a pressure reducing valve is compared with the system including the proposed pump in turbine mode.
|
|
|
The diagonal pump in turbine regime
Šimunek, Ondřej ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
The thesis is focused on hydraulic design of a semi-axial pump with an axial diffusor with guide vane. The pump is designed with respect to the turbine mode so that it can be used for low-potential energy harvesting or energy storage. The design of the pump is assessed by numerical fluid mechanics using commercial software Ansys CFX.
|
|
|
Study of unsteady phenomena in pump as turbine
Hliboký, Samuel ; Zemanová, Lucie (referee) ; Štefan, David (advisor)
This diploma thesis deals with centrifugal pump running as a turbine. Basic working principles of a pump are included, both in pump and turbine regime. Experimental data obtained from laboratory test bed are compared with CFD simulation on slightly simplified geometry. Obtained results are then processed using spectrogram. Influence of time step and mesh size on results is also researched.
|
|
|
CFD simulation of centrifugal pump working as a turbine (PaT) - influence of impeller side wall gaps on simulation results
Tomšej, Radek ; Zemanová, Lucie (referee) ; Štefan, David (advisor)
This master‘s thesis deals with a centrifugal pump running in reverse (turbine) mode, often called “pump-as-turbine”. The introduction lists basic principles and information about the direct (pump) and reverse modes. Several methodologies for predicting reverse operating point and efficiency evolution are used and compared with simulation results. Using CFD simulations, results obtained with simplified (excluding impeller side wall gaps) and complete geometry (including impeller side wall gaps) are assessed. Furthermore, the results of impeller trimming are evaluated with an aim to find the maximum power and efficiency. Impeller side wall gaps effect is analyzed in terms of friction torque and power loss.
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