Docstoc

Why Not the Sun? Advantages of and Problems with Solar Energy

Document Sample
Why Not the Sun? Advantages of and Problems with Solar Energy Powered By Docstoc
					
				
DOCUMENT INFO
Description: This Discovery Guide is not about passive solar, but about more ―active‖ uses of solar as a direct means of replacing energy currently generated mainly by fossil fuels, such as coal, oil, and natural gas. These more ―active‖ solar energy uses can in turn be divided into two main groups. The first is Solar Thermal, which traditionally has been used to heat water and is increasingly being used, in a more centralized fashion, in large energy plants. The second is solar cells, which can in turn be divided into bulk or wafer based, usually employing silicon, and thin film, which employs a variety of metals and is easily manufactured and installed, but currently requires more square footage to do the work of wafer based cells.