作者:城市网 来源:www.xue.net 更新日期：2013-5-10
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California Gives Green Light to Space Power
Energy beamed down from space is one step closer to reality, now that California has given the green light to an agreement that would see the Pacific Gas and Electric Company buy 200 megawatts of power beamed down from solar-power satellites beginning in 2016. But some major challenges will have to be overcome if the technology is to be used widely.
A start-up company called Solaren is designing the satellites, which it says will use radio waves to beam energy down to a receiving station on Earth.
The attraction of collecting solar power in space is the almost interrupted sunshine available in geosychronous orbit Earth-based solar cells, by contrast , can only collect sunlight during daytime and when skies are clear.
But space-based solar power must grapple with the high cost per kilogram of launching things into space, says Richard Schwartz of Purdue University in West Lafayette, Indiana, “ If you’re talking about it being economically viable for power of the Earth, it’s a tough go,” he says.
Cal Boerman, Solaren’s director of energy services, says the company designed its satellites with a view to keeping launch costs down.“We knew we had to come up with a different, revolutionary design,” he says. A parent the company has won describes ways to reduce the system’s weight, including using inflatable mirrors to focus sunlight on solar cells, so a smaller number can collect the same amount of energy.
But using mirrors introduces other challenges, including keeping the solar cells from overhealing, says Scnwartz. “You have to take care of heat dissipation because you’re now concentrating a lot of energy in one place,” he says. According to the company’s patent. Solaren’s solar cells will be connected to radiators to help keep them cool.
Though Boerman says the company believes it can make space-based solar power work, it is not expecting to crowd out other forms of renewable energy laws in California and other states require increasing use of renewable energy in coming years, he points out. “To meet those needs , we’re going to need all types of renewable energy sources.” he says.
1. Solar-power satellites will use radio waves to beam energy down from space.
A Right B Wrong C Not mentioned
2. Solaren is going to design 200 solar-power satellites.
A Right B Wrong C Not mentioned
3. Space-based solar cells could collect solar power only when skies are clear.
A Right B Wrong C Not mentioned
4 .One advantage of the space-based solar power system is that is that it is economical.
A Right B Wrong C Not mentioned
5. Inflatable mirrors are used to reduce the weight of the space-based solar power.
A Right B Wrong C Not mentioned
6. Space-based solar power will rule out other forms of renewable energy sources.
A Right B Wrong C Not mentioned
7. Many countries will grant permission for the use of use space-based solar power soon.
A Right B Wrong C Not mentioned
参考答案：A C B B A B C
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