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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:
Abidin et al.
Ocean Thermal Energy Conversion (OTEC) harnesses thermal energy stored at different seawater depths via power generation from a thermodynamic closed-loop cyclical system. Apart from its consistent energy generation, it could be diversified into other side industries, making OTEC an attractive and sustainable source of renewable energy. However, the process that utilises seawater as its main…
- Conference Paper:
Halimi and Generanta
Nowadays, the energy demand is continuous increasing due to the growing population in the world. However, the major primary energy resources, fossil fuels, are inadequate. Thus, it is required to find another energy resources, especially the renewable ones, to meet the energy demand. One of prospective renewable energy resources is marine energy. In this paper, an ammonia-water zeotropic…
- Journal Article:
Lee et al.
An azeotropic mixture of R32/R290 is proposed for both building air-conditioning and ocean thermal energy conversion (OTEC) applications. R32/R290 is an environmentally safe working fluid mixture with no ozone depletion potential (ODP) and low global warming potential (GWP). This mixture can successfully replace R410A used in many residential air-conditioners and heat pumps since its GWP is…
- Report:
Miller and Ascari
Ocean Thermal Energy Conversion can exploit natural temperature gradients in the oceans to generate usable forms of energy (for example, cost-competitive baseload electricity in tropical regions such as Hawaii) free from fossil fuel consumption and global warming emissions. The No.1 acknowledged challenge of constructing an OTEC plant is the Cold Water Pipe (CWP), which draws cold water from…
- Conference Paper:
Azam et al.
Ocean Thermal Energy Conversion (OTEC) is a renewable energy source in which energy is produced by converting the heat stored in the sea or the ocean thermal energy into valuable work, based on the temperature difference between the warm surface seawater and the cold deep seawater. One of the OTEC system requirements is to have a seawater temperature difference at a minimum of 20 °C within a…
- Journal Article:
Matsuda et al.
Recently, the importance of sustainable energy using renewable resources has been recognized. As one of the sustainable energy resources, ocean thermal energy conversion (OTEC) is important for the development of a next-generation energy source. This paper proposes a method to construct a state-space model for an OTEC plant using the Rankine cycle. The state-space model is constructed based on…
- Presentation:
Yu and Asthagiri
Ocean thermal energy conversion (OTEC) uses large temperature differences between the surface and deep waters in the ocean for dependable renewable energy production. Compared to traditional approaches which use a working fluid, thermoelectric (TE) OTEC utilizes TE materials and has fewer moving parts, therefore promising greater corrosion resistance, biofouling resistance, and more widespread…
- 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:
Straatman and van Sark
Solar thermal electricity (STE) generation offers an excellent opportunity to supply electricity with a non-CO2 emitting technology. However, present costs hamper widespread deployment and therefore research and development efforts are concentrated on accelerated cost reductions and efficiency improvements. Many focus on the latter, but in this paper we rather focus on attaining…
- Journal Article:
Zhang et al.
The practical implementation of ocean thermal energy conversion technology faces constraints due to the low temperature differentials, resulting in limited energy conversion efficiency. This research introduces a novel combined power-refrigeration cycle that utilizes a hybrid liquid-gas-gas ejector to amplify the conversion efficiency. The gas extracted from the turbine is employed as…
- Journal Article:
Uehara et al.
A performance analysis of an OTEC plant using an integrated hybrid cycle (I–H OTEC Cycle) has been conducted. The I–H OTEC cycle is a combination of a closed-cycle OTEC plant and a spray flash desalination plant. In an I–H OTEC cycle, warm sea water evaporates the liquid ammonia in the OTEC evaporator, then enters the flash chamber and evaporates itself. The evaporated steam enters the…
- Journal Article:
Zhang et al.
This study proposes a novel extraction–ejection combined power and refrigeration cycle for ocean thermal energy conversion (OTEC). Ammonia-water is utilized as the working fluid. By introducing a steam-turbine extraction-gas-driven ejector between the evaporator and the absorber, the gas flows into the absorber after it is cooled, thereby enabling the cycle to recover pressure-difference…
- 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…
- Journal Article:
Dezhdar et al.
Given the limitations of fossil fuels, humans must develop alternate energy sources. Solar energy and ocean thermal energy are known as a safe, secure, promising, and clean instrument for this purpose due to their enormous potential. A hybrid system of solar energy and ocean thermal energy with a thermoelectric generator is examined in this study to generate clean electricity and utilize the…
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