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• Design of new comprehensive, low-cost, easier to install PVS with higher dura- bility (25-30 years). 4.3. WIND ENERGY 4.3.1. Present status and potential Modern commercial wind energy started in the early 1980s, on the wake of the 1970s oil crisis, when security and diversification of energy supply issues, and to a lesser extent, long-term sustainability concerns, triggered the interest in renewable energy sources. Significant design consolidation has taken place since the 1980s, although new types of wind generators have also introduced further diversification. Many developments and improvements have taken place since the initial commer- cialization of wind technology in the early 1980s, but the basic architecture of main- stream design has changed little. Most wind turbines (WTs) have upwind rotors, and are actively yawed to keep them aligned with the prevailing wind direction. The three-bladed rotor that proliferated has a separate front bearing and a low-speed shaft connected to a gearbox, which provides output speeds suitable for a four-pole generator. Commonly, blade pitch is actively and continuously adjusted in the largest WTs to regulate the output at higher operational wind speeds. Apparently, there’s a consensus that pitch regulation will be adopted for all future large WTs. Most WT blades are made of compound glass fiber-polyester or glass fiber- epoxy materials. Although the manufacturing process involves some automation, its labor-intensive procedures can be traced back to their boat-building origins. In general, the supporting structures are tubular steel towers with some kind of taper- ing, both in metal wall thickness and in base-to-top diameter. Concrete towers, 68 SUSTAINABLE ENERGY IN LATIN AMERICA AND THE CARIBBEAN: POTENTIAL FOR THE FUTUREPDF Image | SUSTAINABLE ENERGY IN LATIN AMERICA CARIBBEAN
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