Nowadays, wind energy is one of the most cost-effective and environmentally friendly energies in high demand due to shortages fossil fuels necessity reduce global carbon footprint. One main goals turbine development increase power output either by increasing blade swept area or velocity wind. In this article, a proprietary augmentation system was introduced vertical axis turbines (VAWT) free st...

A recirculating aquaculture system was developed to hold native fishes for experimental pumping trails at the U.S. Bureau of Reclamation’s Tracy Fish Collection Facility (TFCF), Sacramento-San Joaquin Delta, California. The TFCF operates to prevent the entrainment of juvenile and adult fishes, including endangered species, into the Delta Mendota Canal. TFCF uses louvers to direct into the colle...

An experimental study was conducted to investigate on the effects of the relative rotation directions of two tandwm wind turbines on the power production performance and flow characteristics in the wakes of two wind turbines in tandem. The experimental study was performed in a large-scale Aerodynamics/tmospheric Boundary Layer (AABL) Wind Tunnel located at the Aerospace Engineering Department o...

Modern designs for straight-bladed vertical axis wind turbines (VAWTs)feature smaller individual footprints than conventional horizontal axis wind turbines (HAWTs), allowing closer spacing of turbines and potentially greater power extraction for the same wind farm footprint. However, the wakes of upstream turbines could persist far enough to affect the performance of closely-spaced downstream t...

The selectivity of fishing gears with respect to fish species and size is important, both for fisheries management and fishing operations. Purse seining is an efficient, environmentally friendly fish capture methodology generally targeting single species aggregations, but once a fish school has been selected and surrounded by the seine, there is no selections for individual size, species or cat...

Unlike conventional hydro and tidal barrage installations, water current turbines in open flow can generate power from flowing water with almost zero environmental impact, over a much wider range of sites than those available for conventional tidal power generation. Recent developments in current turbine design are reviewed and some potential advantages of ducted or “diffuser-augmented” current...

Utility system operators and engineers want a better understanding of the impacts of large wind farms on grid stability before they are interconnected to the grid. Utilities need wind electrical models and methods of analysis that will help them analyze potential problems of grid stability. Without the necessary tools and knowledge of the behavior of large wind farms, utilities are reluctant to...

Fish farming methods that is suitable for the Iraqi marshes were classified in two main categories: water based and soil methods. In first category it was found floating net cages could be used rivers branches, while fixed shallowest bodies. It there a good opportunity to use Enclosures Pens. The natural grazing method applied wide area all over marsh, especially which enclosed by dams. second ...

Every year the number of installed wind power plants in the world increases. The horizontal axis wind turbine is the most common type of turbine but there exist other types. Here, three different wind turbines are considered; the horizontal axis wind turbine and two different concepts of vertical axis wind turbines; the Darrieus turbine and the H-rotor. This paper aims at making a comparative s...

An impulse bio turbine with circular inlet/outlet area which can be integrated into small devices, is presented. The system was designed using a scaled impulse macro turbine model, which was modified in size and shape to guarantee integration in implantable bio medical devices and physiological circulatory system. The simplicity in the design reduces cost and makes it very suitable for developi...