Library

Overview

This section of our website is dedicated to building a reference library of information on all aspects of blade-lift type Vertical Axis Wind Turbines (VAWTs). Initially, the library contains the references used in these web pages, along with others that we have collected as part of our research and development.

We welcome submissions that are based on sound scientific methods and that fall into four broad subject areas: VAWTs and Modeling; Wake and Vertical Mixing; Wildlife; and Miscellaneous. Our goal is for this library to become the “go-to” place to find VAWT-related information. Our approach is to let its structure evolve over time. This is our start. We welcome your feedback and help.

Impacts and Evaluation

Even though VAWTs have been around almost as long as HAWTs, there is relatively little science about them and their impacts and benefits. There is also a dearth of information on near-ground wind resources, as most wind atlases and documentation is for wind speeds at 30-plus meters (98 ft) above the ground and not at 11-15m (36-49 ft), which is the "hub" height of the WHI G168 VAWTs.

Thus, this section of the library is divided into three parts: environment, wildlife and projects. The latter section is where we plan to add wind atlases and other resources that would be useful to people interested in the potential of shorter VAWTs for their projects.

Technology

VAWT technology is not as advanced in its engineering and modeling as that of its horizontal axis cousin. One step toward resolving this is to find and make available the research that has been done. This library section has begun that process. WHI welcomes research papers and other material, regardless of the date issued, to add to the body of knowledge about all aspects of VAWTs. Someday, vertical axis technology will be as sophisticated and well known as that of HAWTs. We hope this library helps achieve that vision. Please send us findings that might be useful to others.

WHI News

Periodically, Wind Harvest International issues press releases and updates about the company and our technology. These will be listed here in chronological order.

First Small-Sized Vertical Axis Wind Turbine Ready for Certification
Kevin Wolf, Wind Harvest International Press Release, 15 May 2017

Wind Harvest International has submitted the Design Evaluation for the certification of its 70kW WHI VAWT Model G168 to the ICC-SRCC's Small Wind Certification program. The ICC-SRCC oversees the U.S certification of small and medium wind turbines. The Design Evaluation includes sections on the turbines description and specifications, its fatigues life, its frequency response and its components' capabilities to withstand Class II extreme loads, and follows prototype testing as the first step in the certification process.

Researching and developing the potential of VAWTs to double the capacities of California's wind farms while preventing harm to birds
A research and development proposal for presentation to the California Energy Commission EPIC Program; last updated: 10 June 2017

Wind Harvest International (WHI) is seeking grant funding to research how to open the market for Vertical Axis Wind Turbines (VAWTs) in existing and new wind farms composed of Horizontal Axis Wind Turbines (HAWTs). Before VAWTs developments will be possible in these wind farms, third-party verification is needed to ensure that the new, vertically spinning turbines below do not create wake and turbulence that damages the expensive HAWTs above and downwind of them. If these wind farms include habitat for rare and endangered birds, then third-party collected data is needed to demonstrate either that the VAWTs won’t harm these species or that they can be operated safely when these birds and bats are in their vicinity.

A 5 x 5 x 1/2-meter thick slab of rbar and concrete was poured in early January at the Underwriters Laboratories' and West Texas A&M University's Advanced Wind Turbine Testing Facility near Canyon, Texas, in preparation for the installation and certification of Wind Harvest International's G168 VAWT System.

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