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Sustainability Assessment of Towers for Wind Turbines
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The increasing world energy demand during last few decades has led wind powerinstalled capacity to a significant growth. Wind power is a renewable resource, whichmeans using it will not deplete the earth's supply of fossil fuels. It is also a clean energysource, and operation does not produce carbon dioxide or any other type of air pollution,as do conventional fossil fuel power sources.However, there is an environmental impact associated dominantly during theproduction and dismantling. During manufacture of the wind turbine, steel, concrete andother materials will have to be made and transported using energy-intensive processes,generally using fossil energy sources.Several studies demonstrate that among the different parts conforming a wind plant,tower+foundation are the most energy intensive components.A sustainability assessment of a “virtual” tower for wind turbines, 100m hub heightwith a assumed 3.6 MW capacity wind turbine is made focusing on the embodied CO2equivalent emissions and energy consumed in production and execution of the towers. Acomparison between the two most common types of tower is done: tubular steel tower andprestressed concrete tower. Data on generation of electrical energy from the wind power isevaluated for various countries and simple assessment is made to get estimation of theequivalent CO2 per MW·h of produced electricity.Load tables are commonly provided by the turbine producers when a specific towerdesign is made. However, a single horizontal force at the hub height is used as anapproximation of an equivalent characteristic load for ultimate limit state. Fatigue damageis assessed in the same way decreasing the considered load by a reasonable factor.

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URN: urn:nbn:se:ltu:diva-46863Local ID: 47ac14e1-2231-4b00-becd-6cf5b1d46883OAI: diva2:1020178
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20120222 (ysko)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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