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- Ren et al.
Osmotic energy conversion (OEC) is attractive for salinity-gradient power utilization. Nevertheless, the OEC still faces a challenge of relatively low power density owing to the limited ionic mass transfer. In this paper, we present designed interfacial nanostructures (DINS) to enhance ion selective transport in nanopores. The maximum osmotic power under 50-fold salt concentration ratio is…
- Thorson et al.
Marine energy, including ocean waves, ocean currents, ocean thermal gradients, tides, and river currents, is a vast and untapped resource that can be harnessed to help enable the transition to renewable energy. Marine energy is an attractive renewable resource because of its energy density, predictability, and persistence. Further, marine energy has the potential to provide energy for utility-…
- García-Santiago et al.
While the need to make use of clean, renewable energies in electricity generation is universally understood, Mexico is lagging behind other countries in terms of the contribution these sources have in the production of energy nationally. The first hurdle to overcome is that of providing accurate information for decision makers and potential investors. In the case of renewable marine energy…
- Zhou et al.
Solid inorganic electrolytes (SIEs) are promising materials for ion exchange membranes used in reverse electrodialysis (RED) processes to produce clean energy. However, SIEs have not yet been used in RED. Herein, Mg-substituted Na3Zr2Si2PO12(NZMSP), an inorganic sodium superionic conductor, is used for the first time as a single-ion conducting ion exchange membrane in RED. The bilayer…
- Owen
Can pressure retarded osmosis (PRO) reduce or eliminate diesel dependency in Bella Coola, British Columbia? This study looked into the possibility of using PRO to replace diesel in Bella Coola by analyzing the energy potential of six watersheds in the region, comparing the levelized cost of electricity (LCOE) of PRO to current diesel prices, and examining potential environmental impacts…
- Tan et al.
Hydrogels can be employed to recoversalinity gradient(SG) energy as they can exhibit reversible swelling and shrinking behaviors in alternate freshwater and sea water. The swelling ratio and mechanic property of hydrogels are essential for the SG energy harvest. Herein, different amounts ofgraphene oxide(GO) or carbonnanotube(CNT) were successfully introduced to the matrix of poly(acrylic acid…
- Alcerreca-Huerta et al.
This study estimates the environmental and technical energy potential of the thermohaline conditions in the Mexico–Belize riverineestuary. Site-specific conditions were considered based on monthly water temperature,salinity, and river discharge field measurements along the Hondo River estuary from 2018 to 2019. The practical extractable energy assessment described the possibility of outlining…
- Shamsuddin et al.
Savoniusturbinesare practical for rivers with low speeds due to their simple design and good self-starting capabilities. Despite these advantages, real implementation is still limited due to their low power efficiency. However, the experimental studies are scarce as they mainly focus on power performance, neglecting the impact of materials exposed to the wind or water medium. Therefore, the…
- Shashikumar and Madav
In the present paper, three-dimensional numerical simulations were carried out to examine the influence of the overlap ratio between the two straight edges on the advancing and returning blades of the novel V-shapedrotor bladeprofiles using thesliding meshtechnique. The performance parameters were computed with respect to the tip speed ratio. The findings show that the coefficient of torque…
- Gunawan et al.
Although hydrokinetic turbines offer many benefits their installation and operation also present challenges. Similar to other riverine structures, a key issue facing the hydrokinetic structures is the trapping of sediment and debris (organic and non-organic). This issue impacts the financial feasibility of projects as well as posing environmental concerns. The trapping of sediment and debris…
- Loeffler et al.
The BladeRunner Energy hydrokinetic turbine A kw-scale prototype of the BladeRunner system was tested at the Tanana River Test Site in Nenana, AK in the fall of 2021 and the summer of 2022. The BladeRunner hydrokinetic turbine uses a flexible torsional cable to connect a submerged trailing rotor to a floating generator housing that is supported by a single mooring line. The BladeRunner design…
- Polagye et al.
When the swept area of an array of current turbines occupies a substantial fraction of a channel’s cross-section, their unit performance is augmented. In moderate confinement, power coefficients for individual turbines may exceed the Betz-Lanchester-Zhukowsky limit, and, in practice, exceed unity by drawing on both kinetic and potential energy embodied in the flow. This effect has long been…
- Duvoy et al.
We introduce a methodology for a comprehensive characterization of river flows from transects surveyed at different times over near coincident transects from acoustic Doppler current profiler (ADCP) data acquired from a moving vessel.
The ADCP measurements are first rotated from East and North velocities into primary and secondary flows that are projected onto a grid of points on an…
- Browning et al.
Many remote communities in Alaska have significant hydrokinetic resources. However, the remote locations make collecting large amounts of resource data challenging and costly. Through accurately up sampling hourly ADCP data, we are seeking ways to faithfully reproduce annual energy estimates for velocity time series with high enough temporal resolution to be useful for grid-modeling tools.…
- Giannini et al.
The worldwide river and tidal hydrokinetic power potential is considerable. Harnessing such potential could allow the generation of a significant amount of sustainable electricity for local uses. To the present, most studies on hydrokinetic power have focused on large-scale commercial technology development, large tidal farms planning, and high-intensity resources assessment. Reduced attention…
- Zhou et al.
The salinity gradient energy, also known as “blue energy”, widely exists at the junction of river water and seawater, which is a promising renewable energy. When two solutions with different salt concentrations are mixed, they will spontaneously release energy. The blue energy is in the form of chemical energy. The available salinity gradient energy all over the world is huge, so the study of…
- Igiugig Village Council
The Igiugig Village Council (IVC) installed and operates a marine energy device, the ORPC RivGen® PowerSystem, in the Kvichak River in Igiugig, Alaska. As required by IVC’s 2019 FERC license to operate thepower system, a Fish Monitoring Plan was developed and implemented for collecting images fromunderwater cameras to assess the interaction of sockeye salmon with the RivGen Power System.…
- Dartoomi et al.
Energy production is one of today's most pressing issues. Finding alternative energy sources has become one of the hottest research areas for scholars due to the limited use of fossil resources. Using water sources of different concentrations is one of the newest methods of energy production. Due to the energy of mixing fluids, two fluids of different concentrations on both sides of a…
- Zhang et al.
Nanofluid reverse electrodialysis (RED) is considered the most promising technology for harvesting osmotic energy. As materials used for RED, natural nanofluid materials are renewable but suffer from low power densities due to weak surface charge densities or irregular ion transport channels, while advanced materials from sophisticated manufacturing are too expensive. Here, a pair of novel…
- Dartoomi et al.
Researchers are looking for new, clean, and accessible sources of energy due to rising global warming caused by the usage of fossil fuels and the irreversible harm that this does to the environment. Water salinity is one of the newest and most accessible renewable energy sources, which has sparked a lot of interest. Reverse electrodialysis (RED) has been utilized in the past to turn saline…
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