ENV 1101 Chapter Notes -Passive Solar Building Design, Cotia, Water Heating
25 Oct 2014
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To keep below 2 c, need to reduce global emissions by 80% from 1990 levels. Means a drastic shift towards increased energy conservation and developing renewable, non-fossil fuel energy sources. Turbines in a dam in a river. Body of water behind their walls in the river valleys upstream. Turbines capture the energy of water in motion to create electricity. Three gorges dam, yangtze china rance tidal barrage, brittany france. Largest hydro-electric dam in world the largest tidal barrage in world. Run of river or in-stream turbines are smaller versions with less environmental impact. Once constructed, electricity can be produced at a fairly constant rate for long time; therefore cheap. Can also be used for irrigation and flood control. Easy to turn on and off, provides storage, helps balance variable power sources. Up to 90% efficient (compared to 25-40% efficient coal) Flooding of large areas of land can have significant environmental impacts (methane, methyl mercury, habitat destruction)
