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Development of windmill with wind-lens

Professor Yuji Ooya
Associate Professor Takashi Karasudani

Development of wind-lens technology for supplying stable electricity to an irrigation plant in China

Project objective

To stop desertification in northwest China, an area facing deepening global environmental problems, and to turn the land into green land, irrigation and greenery projects began by capitalizing on the vast wind energy as a power source in the northwest. A small windmill, which can be moved and installed easily, is the best means of power generation in this area without power infrastructure. The highly efficient windmill with wind lens offering the world’s best small windmill performance, developed by the proponent group, will be improved, remodeled and enlarged through technological development. A number of small windmills with wind lens will be introduced to build a dynamic wind farm for irrigation, and their effectiveness for the greenery project will be examined.

Description of Project

To take the first step toward the greening of vast desert areas in China, the present windmill with rated capacity of 1kW will be examined and remodeled to develop a highly mobile windmill that can easily installed and appropriate for the wind speed and conditions in northwest China. In addition, a larger windmill with wind lens with rotors 2 meters in diameter and a rated capacity of 5kW will be developed to further enhance the windmill. The technology for the windmill with wind lens as above will be developed and several dozen grids set up in the desert. A mini plant will be constructed for pumping irrigation system by building a network of distributed power sources, ensuring that micro-grids will stably supply power by combining the network and power storage technology using batteries. This plant will implement tree planting and greening the desert, and its effectiveness will be examined.

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Technical issues and novel technology

The project will study wind conditions in northwestern China, and review wind resistance assessment of windmill with wind lens based on the study results. That will allow reexamining the strength and structural design (the strength and structure of main body and tower, the strength of understructure) of windmill with wind lens, which will lead to developing a lighter windmill that is easy to move and install. Wind power generation fluctuates wildly due to varying wind supply and force. Fluctuation necessitates developing a system that uses a battery to manage this unstable power source to stably supply electricity to electric equipment such as pumps, and that functions as a network within the wind farm. To further improve usefulness, developing a larger windmill with wind lens is necessary. For that purpose, the project aims to develop a 3kW windmill with wind lens as quickly as possible by increasing the wind load and structural weight of the windmill with a wind collector and by overcoming technical problems including changing control technology.

This project is a new challenge to enable full-scale power generation by using a high performance windmill with wind lens in northwest China.
This is the first attempt to build a wind farm using a windmill with wind lens. The project aims to establish a micro-grid model plant that utilizes natural energy, which is expected to create great demand in the future.

Expected outcomes and post-implementation plan

The project will be established as one of the most effective projects to stop desertification in northwestern China and turn the area into green land. The project will use inexhaustible wind energy to irrigate and plant trees to green the desert, contributing to solving global environmental problems.
This will be a model project for efficiently utilizing wind energy.
It will significantly contribute to expanding use of windmill with wind lens, which was developed in Japan.

The post-implementation plan is to study and develop a larger windmill with wind lens (with rotors 3 to 12 meters in diameter and rated capacity of 10 to 100kW) through developing technology to increase the capacity of the windmill with wind lens to 3kW, and to introduce a larger windmill in the vast land of China where there is no power grid.
The plan is expected to contribute to energy demand in China if, in the future, it combines power generated by an independent, distributed power source and an effective storage method such as the fuel cell.
If it is demonstrated that the wind farm with a windmill with wind lens is an effective tool for irrigation and greenery projects as a mini power generation plant, the enlargement of plant will be planned, and the plan will be implemented in areas in which it is easy to implement it, with an eye to turning it into a grand project that systematically greens vast desert areas in China.

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This project was executed in the proposal public advertisement type development support research cooperation business of the H18-19 fiscal year of Ministry of Economy, Trade and Industry NEDO.

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