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marți, 15 noiembrie 2011

Parisul si energia geotermala

Parisul si energia geotermala

Folosirea acestei energii curate va scadea cu 60% emisiile de gaze cu efect de sera ale orasului. Proiectul costa 31 de milioane de euro.

Apa la temperatura de 57 de grade va fi folosita in sistemul de incalzire al orasului, dupa care, la 20 de grade, va fi injectata in panza de apa termala din pamant.

Sub Paris se afla cea mai mare si mai adanca panza de apa termala din Franta, panza de apa Dogger, cu o temperatura cuprinsa intre 56 si 85 de grade.

Proiectul are si inconveniente. O exploatare geotermala necesita kilometri de teava ingropata, lucrari care nu pot fi facute decat odata cu mari lucrari de urbanism, avand in vedere multitudinea cablurilor ingropate si conductelor canalizarii.

In plus, panza de apa termala nu este inepuizabila. Incalzirea cu apa
termala a unui mare de locuinte risca sa duca la racirea apei (riscul este evident de la 300.000 de locuinte care ar folosi apa termala). Apa reinjectata la 20 de grade are nevoie de 100 – 150 de ani pentru a reveni la temperatura initiala.

Sursa: Lemonde

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