This site-wide search returns results for all documents and events in Tethys Engineering, prioritizing the best matches. Partial word matches are returned (e.g. "engineer" finds "engineering"), but every entered term must be found. If you don't find any results, try reducing the number of words entered or removing special characters. Filters to the right can help narrow your search. Tethys Engineering features an integrated search with other marine renewable energy databases in PRIMRE - click the buttons below "Showing Results for" to search other integrated databases.
Showing Results for
- Journal Article:
Badawy et al.
River current energy is regarded as one of the most environmentally friendly sources of electricity. Because it doesn't produce power by holding water in a reservoir and causing a height differential, a river current (or hydrokinetic) device is not a dam. Turbines placed inside rivers immediately harvest the kinetic energy of flowing water. Like Egypt's river Nile can be used to study this…
- Journal Article:
Lisicki et al.
The recent revival of Bayesian optimization has caused widespread utilization of easily accessible and versatile tools in different areas, which involve the search for optimal design or decisions. This method, however, has not yet been explored within the field of renewable energy systems. This study aims to introduce the main benefits of the procedure to the community through the practical…
- Journal Article:
Dellinger et al.
The Archimedean Screw Generator (ASG) allows transforming potential energy of a fluid into mechanical energy and is convenient for low-head hydraulic sites. As it is a new and growing technology with few guidelines for design and performance optimization, the present contribution proposes a new experimental and numerical investigation method for studying ASG performances. In order to study the…
- Journal Article:
Nuernbergk and Rorres
Archimedes screws have become increasingly popular throughout Europe to drive hydropower plants using residual flow from a stream or river. This heightened usage of such screws during the past few years is attributable to their robustness, simplicity, and fish friendliness. Presently the dimensioning of a hydropower site equipped with an Archimedes screw is dependent mainly on the experience…
- Journal Article:
Shahverdi et al.
Archimedes screw turbines have gained popularity in generating power from flowing water. One aspect that hasn't been considered yet is optimizing those parameters that are considered assumptions in the prediction models. In this research, a simple procedure was introduced to design an appropriate Archimedes screw turbine for a given site using a prediction model and an optimization model.…
- Journal Article:
Bouvant et al.
In this study, the performance of an Archimedes screw turbine (AST), in terms of the power coefficient (CP), was evaluated. The design parameters, including the inner and the outer diameter (Di and Do, respectively), the axle length (L), the blade inclination with respect to the longitudinal axis of the screw (α) and the blade stride (p), were…
- Journal Article:
Zhang et al.
Aiming to prolong the duration of detection equipment deployed in deep water, a new type of hydrokinetic turbine with good self-starting ability should be developed to harness low-speed current energy in such deep-water scenarios. In this study, a novel ductless Archimedes screw turbine is proposed to improve the system’s startup performance for low-speed current applications. An…
- Conference Paper:
Stergiopoulou et al.
The Archimedean renewable energy systems are enjoying a renewed interest, since about one decade, and have become increasingly popular throughout Europe. It seems that this low head Archimedean technology is still a niche product. Despite the age of the Archimedean screws there is no consistent and appropriate theory for the screw hydraulic design linking the screw's geometry with their…
- Journal Article:
Shahverdi et al.
Archimedes Screw Turbines (ASTs) can become a popular device to generate electricity from hydraulic power at very low-head or nearly zero-head places. In this article, the performance of ASTs is numerically investigated using Computational Fluid Dynamics (CFD) to assess different screw rotation speeds, volume flow rates, and inclination angles. The numerical model is validated using…
- Thesis:
Krybill
Finite Element Analysis (FEA) can be a great tool for analyzing the structural integrity of any mechanical design. Paired with Computational Fluid Dynamics (CFD) the forces can be evaluated on a hydro turbine allowing for such an analysis. In this case, two micro hydro turbines were analyzed, an Archimedes Screw design, in the case of an available head, and a hydrokinetic design, aiming at…
- Journal Article:
Kozyn et al.
Previous hydraulic studies of Archimedes screw power generators (ASGs) have been mostly at laboratory scale. The validity of scaling up models based on these studies for application in field-scale ASGs has been a major research gap. This study developed a nondimensional artificial neural networks (ANN) model to predict shaft power of an ASG using extensive multiscale data sets. The model was…
- Thesis:
Waters
The UK has an enormous potential for tidal range energy. With the threat of global warming and the decline of the North Sea oil industry, national energy focus is shifting towards this form of renewable energy. Following in the footsteps of the first tidal barrage scheme in La Rance, the 320MW Swansea bay lagoon scheme has recently been given governmental approval (BBC News, 2015). Like…
- Thesis:
Kozyn
This thesis presents a complete power loss model for an Archimedes screw turbine (AST), capable of predicting the mechanical power of an AST based on available energy head. This model amends a prior idealized frictionless AST performance model to include losses from inlet and outlet entrance effects, internal hydraulic friction and outlet submersion. Laboratory experiments on scale-model ASTs…
- Thesis:
Songin
This study investigated how power and efficiency in Archimedes screw turbines (AST) is impacted by varying parameters including; length, inner and outer diameter, pitch and number of flights. An index was created that determined how important some variables were over others by testing a number of laboratory sized screws and comparing the resulting power and efficiencies. A MATLAB AST…
- Thesis:
Lyons
Archimedes Screw Turbines (ASTs) are being utilized across Europe and are beginning to be utilized in North America for micro-hydropower (less than 500 kW) production. There is currently no mathematical model in the literature which describes the power production of an AST of arbitrary geometry and at partial-fill conditions, and only limited literature on laboratory and full-scale testing of…
- Journal Article:
Zhang et al.
A growing interest in harnessing ocean current energy for deep ocean observation platforms has been encouraged by the requirement of cost saving and wide-range deployment. A new concept of deep-water in-situ power generation system using ductless Archimedes screw hydrokinetic turbines was proposed in this study. To fill the hydrodynamic knowledge gap of ductless Archimedes screw hydrokinetic…
- Journal Article:
Kozyn and Lubitz
This paper presents a complete power loss model for an Archimedes screw used for power generation (ASG) including a non-dimensional model to predict power losses due to outlet submersion flooding. This model amends a prior idealized, frictionless ASG performance model to include power losses due to bearing friction, outlet exit effects, internal hydraulic friction and outlet submersion. This…
- Journal Article:
Dellinger et al.
The generation of renewable energy with Archimedes screw generators (ASG) transforming potential energy of fluid flow into mechanical energy is a growing technology suitable for low-head hydraulic sites. This paper presents an improved theoretical model linking screw performance to screw geometry and flow conditions. This model takes into account leakages, friction losses and variable fill…
- Journal Article:
Lubitz et al.
Archimedes screw generators (ASGs) are beginning to be widely adopted at low-head hydro sites in Europe due to their high efficiency, competitive costs, and low environmental impact. ASGs are particularly appropriate for low-head sites. Power is transferred from a water flow to an Archimedes screw by the distribution of static pressure produced by the water volumes between the flights of the…
- Journal Article:
Rohmer et al.
A small hydro plant using an Archimedes screw is the focused of this work. This is an alternative solution to smallscale hydropower as it exploits unused resources such as small rivers or streams. Archimedes screw plants reverse the pump use principle and exploit the available stream power for energy production in very low head application. Based on the previous studies, the optimal sizing of…
Displaying 1 - 20 of 22