Omni-Directional Axial & Vertical Discharge Windturbines

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SUMMARY

With the need for energy increasing both locally and globally, new technologies will need to be found, researched and embraced to supply this rising demand. Current technologies are having trouble keeping pace, and some not environmentally friendly methods will need to be reduced. As prices rise in the future, it may be more beneficial to produce at least some of this power actually within the structures that need them.

New technologies currently being developed locally and in other areas may prove useful, if used together with existing systems. The long term payback would offset the greater initial costs. This report show how the Omni-directional wind turbine can be used.

INTRODUCTION

With growing global populations many places, most notably outside Canada, are having trouble keeping up with their growing energy demands. In the future this could lead to dramatic price increases in many places, and brown and blackouts in others. With current technologies becoming more unable to meet demand, due to a variety of reasons, a broader, more outside the box approach will be needed.

Given the right environmental conditions, the Omni-direction axial wind turbine (ODAWT) and Omni- directional vertical discharge turbine (ODVDT) could have significant results. These are still emerging technologies, and some questions have yet to be fully explored.

This report summarizes some of the current research, possibilities, and concerns of ODAWT and ODVDT and the role they may play in the future.

HISTORY

The conventional horizontal axis propeller wind turbine is required to have the propeller rotating disk always rightly aligned with the wind direction. Standard horizontal wind turbines have very large blades, up 9 meters in length each. They can produce large amounts of power, sometimes exceeding 1 MW, but have the side effect of producing a low pitch noise that people can find unpleasant, and sometimes harmful. This makes them ideal for wind farms, but must be constructed away from residential areas.

Researchers found that 90% of this sound comes horizontally off the blades and radiates out from the source. By angling the blades axially instead of horizontally dramatically reduces this effect.

ODAWT is still a relatively new technology having been developed in the 1990’s and patented in the United States by Gary D. Roberts in 2002. Appendix “D” It works by having the entire axis rotating along its length. ODVDT was patented in the United States by Vaheisvaran Sureshan in 2008. Appendix “C” It functions by having a rotating housing that first channels the winds upwards before they reach the turbine. Appendix “A” fig 1.

COMMERCIAL APPLICATIONS

Commercial application may more prominently feature the ODAWT type, due to there larger size and potentially greater energy output. Venger Wind Inc. has mounted a series of large ODAWT turbines on top of the Oklahoma Medical Research Foundation (OMRF) in Oklahoma City. The construction of 18 V2 vertical axis wind turbines on the center’s roof is part of a sustainability strategy to create a zero emissions research tower. The turbines are integrated into the design of the building, and precisely positioned to collect winds from 270°. This is one of the largest building integrated wind energy systems in the U.S. The OMRF building is an example of what is possible. These wind turbines are distinctive, while most are fairly small in size, the V2 turbines are large. They are each 18.5 feet tall, and rated at 4.5 kilowatts each. Even given their size, the vertical turbines begin generating electricity at 15 kph, which is lower than Oklahoma City’s annual average wind speed. “The Oklahoma Medical Research Foundation building represents an excellent example of how a roof top wind farm can be successfully implemented. The installations are projected to cut carbon emissions by approximately 2 million pounds annually” (1).

“Their V2...
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