Posts Tagged ‘principles’

Leassons learned at Gotland University

February 15, 2011

From the last time I posted, we have learnt many things about the wind power industry. Here is a short summary of what we studied on this Master:

  • Principles of wind turbines: Components of wind turbines and the differences between synchronous and asynchronous generators must be known to understood the basic principles.
  • Climatology and Boundary Layer Theory: Kinetic energy from wind moves the blades, and thus electrical energy can be produced.
  • Aerodynamics: The shape and chord of blades are optimized by using formulas. Lectures provided by some accademics of Risoe and Uppsala universities were useful to understand these phisical principles.
  • Measurements Methods: Linear, non linear, CFD (Computational Fluids Dynamics) are useful to predict the wind resources at a determinated place by using MCP (measurement correlate and predict) techniques. Hence, software such as WindPro or WinSim are useful tools.
  • Wind Power potentials: Places located in cold climates or offshore wind farms have high potential in future but there are some considerations they must be valorated.
  • Grid Network: Before starting a new wind power project four words must be considered: Wind, wind, wind and infrastructure/grid network. Hence, it is important to know the point of common coupling (PCC) to connect the wind farm to the grid network.
  • Logistic: The other leg of the four words is obvious; roads, docks, and so on.
  • Public acepttance and environmental impact: Visual impact, flicker shadows, noises, consequences to the wildlife are other important aspects.
  • Policy and Legal Planning: Incentives and subsidiaries from administrations, legal frameworks… These frameworks can explain why some countries as Germany has such installed wind power capacity.

The Wind.

June 29, 2010

Earth is surrounded by a fluid that we call air. When air is heated creates High pressures in the atmosphere, and wind flows from High (H) to Low (L) pressure points. But, why does our planet have different temperatures? And even the most important, how can we take advantage of this natural power? In order to explain these questions, on this post we will see how wind acts and the latest researches on the aerodynamic field to convert the wind power in a useful and ecological energy.

There are some reasons to explain why the atmosphere has temperature gradients. Since Christopher Columbus discovered that Earth is a sphere (or almost) five hundred years ago, now we can understand easily that Sun’s radiations impinge on the surface with different power depending on the latitudes. Also, we have the rotation. When the Earth’s face is in front of the Sun, it means that the another face is in the dark, and as we know, days are usually warmer than nights. Finally, our planet’s axis is inclined and when it is summer in the North means it is winter in the South. Furthermore, our planet has other peculiarities (clouds, oceans which keep better the heat than land, white glaciers, so on) that provoke High and Low pressures in the atmosphere.