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A preliminary study about methods for harvesting energy from marine resources

The greatest increase in demand for energy coming from newly industrialized countries where large- scale electricity generation will be required, the environmental requirements for zero or low CO2 emission sources and the need to invest in a sustainable energy mix, involve the development of new energy sources. Wave, tidal and marine current energy could be available as a future energy option and should be able to acquire a significant role in providing a sustainable, secure and safe solution to tackle European and global energy needs. Sun and wind are predictable, but not constant: photovoltaic panels and eolic turbines could barely support alone the peaks of the power request from the grid, and the contribution of hydroelectric seems to have already reached its limits in some European countries. For this reasons, in order to become independent from fossil fuels, it will be fundamental to harvest energy from the largest number of natural phenomena, especially ones that are predictale with high precision, as tides, and ones that are almost constant, as ocean currents.

Mostra/Nascondi contenuto.
1 1. HISTORICAL NOTES 1.1 Tides and tidal mills Ancient people from different ages showed several interests towards natural phenomena linked to the seas and the oceans, and they gave different explanations of them. The event related with seas that probably mostly stimulated the minds of the ancient philosophers and astronomers is the one of tides. The observation was suitable for all, as large expanse of land were periodically submerged by water, conditioning the life of people who lived in these areas: the changing level of water could create problems with boats, as it still does, or prevent the access to some areas of the shore. The first to give a partially correct interpretation of tides is probably the Greek explorer Phyteas, who travelled to the British Isles around 325 BC and was stunned by the higher intensity that tides had on the ocean rather than on the Mediterranean sea. The description of his voyage was well known in the past, but unfortunately it has been lost in the years. However, some writers and historians ascribed to Phyteas the relation of tides to the phases of the Moon. In the 2nd century BC Seleucus of Seleucia, a Babylonian astronomer, supposed that tides were due to the attraction of the Moon. He used also this explanation of tides to argument the Heliocentric theory of Aristarchus of Samos, which stated that the Earth rotated around its own axis which in turn revolved around the Sun. Pliny the Elder (23-79 A.D.), who made an important work of collection of previous scientific texts, in the second book of his Naturalis Historia made some important statements about tides:

Laurea liv.I

Facoltà: Ingegneria

Autore: Riccardo Novo Contatta »

Composta da 70 pagine.

 

Questa tesi ha raggiunto 118 click dal 21/12/2015.

 

Consultata integralmente una volta.

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