No description available.

Vertical-axis wind turbines do not need to be oriented to the wind direction and offer direct rotary output to a ground-level load, making them particularly suitable for water pumping, heating, purification and aeration, as well as stand-alone electricity generation. The use of high-efficiency Darrieus turbines for such applications is virtually prohibited by their inherent inability to self-start. The provision of blade-articulation (variable-pitch blades) has been demonstrated by a number of researchers to make Darrieus turbines self-starting. One aim of this thesis is to evaluate the various concepts manifested in the numerous specific passive variable-pitch designs appearing in the literature, often without theoretical analysis. In the present work, two separate mathematical models have been produced to predict the performance of passive variable-pitch Darrieus-type turbines. A blade-element/momentum theory model has been used to investigate the relationships between the key parameter values and turbine steady-state performance. A strategy for parameter selection has been developed on the basis of these results. A free vortex wake model for passive variable-pitch turbines has been developed, allowing the study of unsteady performance. Significant reduction of average ef- ficiency in a turbulent wind is predicted for a Darrieus turbine. The improved low-speed torque of passive variable-pitch turbines is predicted to significantly improve turbulent wind performance. Two new design concepts for passive variable-pitch turbines are presented that are intended to allow greater control of blade pitch behaviour and improved turbulent wind performance. A prototype turbine featuring these design concepts has been designed, constructed and tested in the wind tunnel. As part of this testing, a technique has been developed for measuring the pitch angle response of one of the turbine blades in operation. This allows comparison of predicted and measured pitch histories and gives insight into the performance of turbines of this type. Results have demonstrated the usefulness of the mathematical models as design tools and have indicated the potential of one of the new design concepts in particular to make a vertical axis wind turbine self-starting.

No description available.

<p>Wind Power desalination for Tunisian markets.</p>

Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.

This project proposes ideas for a Natural Capital Centre in downtown Squamish. The District of Squamish and Ecotrust have stated that the Centre will serve as a tangible demonstration of the town’s commitment to sustainable thought and action, including interpretive information related to the proposed windfarm on Alice Ridge. Squamish has a reputation for being a very windy place. It is a word adapted from Sko-mish, the name of the native nation who first occupied the territory and has a general meaning of ‘strong wind’, or ‘birthplace of the winds.’ The design solution for the NCC aims to tie these two ideas together, demonstrating a strong commitment to sustainabilty and reinforcing the identity of Squamish as the “birthplace of the great winds.” The project framework explores the relationship between renewable energy and people- how people understand and experience natural forces of place, and the relationship between renewable energy and place- how local wind data may be translated into architectural design. The proposed design interventions range from the fundamental organization of the site to small-scale detailing of the sensory experience of the wind. The intent is to inspire a mulititude of other ways to integrate the Squamish winds in future developments that strengthen a ‘sense of place’ in downtown Squamish.

This project proposes ideas for a Natural Capital Centre in downtown Squamish. The District of Squamish and Ecotrust have stated that the Centre will serve as a tangible demonstration of the town’s commitment to sustainable thought and action, including interpretive information related to the proposed windfarm on Alice Ridge. Squamish has a reputation for being a very windy place. It is a word adapted from Sko-mish, the name of the native nation who first occupied the territory and has a general meaning of ‘strong wind’, or ‘birthplace of the winds.’ The design solution for the NCC aims to tie these two ideas together, demonstrating a strong commitment to sustainabilty and reinforcing the identity of Squamish as the “birthplace of the great winds.” The project framework explores the relationship between renewable energy and people- how people understand and experience natural forces of place, and the relationship between renewable energy and place- how local wind data may be translated into architectural design. The proposed design interventions range from the fundamental organization of the site to small-scale detailing of the sensory experience of the wind. The intent is to inspire a mulititude of other ways to integrate the Squamish winds in future developments that strengthen a ‘sense of place’ in downtown Squamish.

Wind Power desalination for Tunisian markets.

This thesis is to investigate the impact of wind power generation to the generation cost of Peng-Hu offshore islands. To find the load characteristics and load composition of Peng-Hu area, the load survey study has been performed to derive the typical load patterns of residential commercial and industrial customer classes. By retriving the power consumption information of all customers from the customer information system (CIS), the load contribution by each customer class during the system peak and off peak periods can be obtained. According to the temperature sensitivity of power consumption, the system load profile can be modified with the temperature change. With the stochastic wind speed and uncertainty of wind power energy, the nonlinear mathematical modeling of wind power generation has been derived by using the fuzzy theory. The wind power generation can therefore be estimated according to the wind speed variation, which will be used to coordinate with the diesel generators to provide electricity of customers served. With the hourly wind power generation and system load profile, the generation cost of diesel generators is therefore obtained. To illustrate the effectiveness of wind power generation for the offshore islands, the actual hourly wind speed for year 2003 is used for computer simulation to solve the avoided generation cost resulted from wind generation. It is found that wind power generators can reduce generation cost of diesel and provide the peak power capability. The cost benefit and incentive of wind power generation for Peng-Hu islands will help Taipower to evaluate the feasibility and effectiveness of wind power generation in Taiwan.

Abstract The energy crisis makes promotion to the research of renew energy being of great urgency. However, the wind power still belong to unstable energy, for some electrical and control problems need to be improved. Owing to wind power in Taiwan still in the beginning period, the thesis is from the introduction of wind machine and its components to realize the wind¡¦s cause and frequency. That can conduct the wind power equation and property. According to wind machine at present, there are two function types. One is constant velocity and the other is variable velocity. Comparing these two types, we have a simulation to gain the energy. By the induction generation equation conduction and building wind power generation system, we can understand the change of wind to affect the electrical dynamical property.