The continuous growth of the population and the increasing demand of urbanization expansion towards the development of high-rise buildings.

To meet their energy demand, the European Community is trying to address the designers to nearly zero-energy buildings.

It is reasonably simple to produce a small residence totally energy efficient however it will be a real challenge to do the same for high-rise residential buildings.

In the general research of the “P> 20” a building of more than 20 floors, equipped with renewable energy systems and with low impact technologies, with complete energy efficiency is studied energy self-sufficient. The first technology introduced in this paper will be the Pico Hydraulics system, a technology for the exploitation of hydroelectric potential of grey water to produce electricity. Finally, the economic, environmental and social advantages of P> 20 is to be illustrated, for Albanian and European cities.



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