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- Journal Article:
Erinofiardi et al.
Potential energy from fluid flow of small rivers or irrigations could be extracted become electricity by using screw turbine. This turbine is promising because the advantages of ultra-low head and fish friendly.Experimental performance of screw turbine for ultra-low head hydro resource is presented in this paper. The screw turbine with anoutside diameter of 142 mm and the water flowrate of 1.2…
- 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…
- Conference Paper:
Kelly and Alam
The ocean is full of untapped energy, however it is a wild place where harsh conditions can occur that can damage wave energy converters (WEC’s). During high load conditions, many WEC’s must go into survival mode to prevent damage or are overdesigned to continue operating in high sea states, which can increase capital costs. The authors propose a different approach, where geometry control is…
- Report:
de Andres et al.
The Anaconda technology is based on the propagation of internal bulge-waves through a flexible, water-filled tube. The tube is intended to sit just below the water surface and is aligned perpendicular to the oncoming wave front (Figure 1). Dynamic pressure variations applied to the flexible tube by incident ocean waves change the cross-section of the tube at frequencies which initiate an…
- Report:
Lehmann and Kojimoto
CalWave Power Technologies UG (CPT) is developing a submerged pressure-differential wave energy converter (WEC) capable of precise load management, lowering capital costs and increasing capacity factor.
CPT is currently working towards a scaled ocean demonstration of the WEC technology.
Historically, primary testing at 1:50 scale was completed in January 2016, and limited testing…
- Presentation:
Wynn et al.
Unlike for wind power, no winning design has yet emerged for wave energy capture. New concepts still have a chance. They need first to be scrutinized for feasibility, in particular survivability, the Achilles Heel of many past efforts. Numerical modeling then allows early-stage, low-cost design optimization for a TPL estimate. Because the PIP (Pitching Inertial Pump) WEC - a novel, pitching,…
- Journal Article:
Shahriar et al.
Saint Martin's Island is one of the most notable tourist spots and the only coral island of Bangladesh in the Bay-of-Bengal. Yet due to lack of electricity supply, this beautiful island is becoming uninhabitable and losing tourist attraction. In this study, a decentralized Mini Hydroelectric Power Plant (MHPP) has been proposed and designed to mitigate electricity demand in the tourist resorts…
- Journal Article:
Jafari et al.
Harvesting energy from waves as a substantial resource of renewable energy has attracted much attention in recent years. Linear permanent magnet vernier generators (LPMVGs) have been widely adopted in wave energy applications to extract clean energy from oceans. Linear PM vernier machines perform based on the magnetic gearing effect, allowing them to offer high power/force density at low…
- Report:
Boerner et al.
CalWave Power Technologies UG (CalWave) is developing the CalWEC, a submerged pressure-differential Wave Energy Converter (WEC) leveraging a fully submerged wave absorption mechanism which leads to higher survivability in extreme weather conditions. Extensive testing at 1:50 scale was completed in 2016, and limited testing at 1:20 scale was completed in late 2016. The results of both…
- 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:
Renganathan and Hossain
CFD modeling of an innovative wave energy device has been carried out in this study. OpenFoam wave modeling solver interFoam has been employed in order to investigate the energy extraction capability of the wave energy device. The innovative concept is based on utilizing the pressure differential under the crest and trough of a wave to drive flow through a pipe. The simulated surface elevation…
- Conference Paper:
Belkourchia et al.
In recent years, energy generation and harvesting took the attention of many researchers, especially the piezoelectric materials for their unique characteristics. One of the promising techniques for energy harvesting is the ocean wave energy harvester resulting from the pressure coming from the ocean movement waves on a vertical cantilever with piezoelectric patches, this results in a fluid-…
- 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:
Stergiopoulou and Stergiopoulos
The possibility of exploiting sea and tidal currents for power generation has given little attention in Mediterranean countries despite the fact that these currents representing a large renewable energy resource could be exploited by “modern old technologies” to provide important levels of electric power. It is also well known that one of the oldest machines still in use is the Archimedes…
- Conference Paper:
Stergiopoulou et al.
This paper presents a brief history of rediscovering the old Archimedean screw pumps as a series of modern and efficient Archimedean hydropower turbines, including floating spiral screw devices, for harnessing the important and unexploited Greek small hydraulic energy potential, producing useful green electricity. The recent research concerns some Archimedean small hydropower applications,…
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