Better Solar Energy Systems: More Heat, More Light Solar photovoltaic (光电的）...

作者: tihaiku 人气: - 评论: 0

问题 Better Solar Energy Systems: More Heat, More Light Solar photovoltaic (光电的）thermal energy systems，or PVTs，generate both heat and electricity，but _______ (51) now they haven’t been very good at the heatgenerating part compared with a stand-alone solar thermal collector. That’s because they operate at low temperatures to cool crystalline silicon (晶体桂）solar cells, ________(52) lets the silicon generate more electricity but isn’t a very efficient way to gather heat. That’s a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower ____________ (53) _ And it’salso a space problem: photovoltaic cells can_____________ (54) up all the space on the roof，leaving little room for thermal applications. In a pair of studies，Joshua Pearce, an associate professor of materials science and engineering，has devised a _______ (55) in the form of a better PVT made with a different kind of silicon. Most solar panels are made with crystalline silicon，but you can also make solar cells out of amorphous (非晶形的）silicon，commonly known _____________ (56) thin-film silicon. They don’t create as much electricity, but they are lighter， flexible， and cheaper. And, because they __________ (57) much less silicon, they have a greener footprint. ______ (58)，thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect. “That means that their efficiency drops when you (59) them to light — pretty much the worst possible effect for a solar cell，” Pearce explains，which is one of the _________ (60) thin-film solar panels make up only a small fraction of the market. However, Pearce and his team found a________ (61) to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new____________ (62) of PVT. You don’t have to cool down thin-film silicon to make it work. In fact, Pearce’s group discovered that by heating it to solar-thermal operating temperatures，near the boiling _____ (63) of water，they could make thicker cells that largely _______ (64) the Staebler-Wronski effect. When they applied the thin-film silicon directly to a solar thermal energy cell ector，they also found that by baking the cell once a day, they _____(65) the solar cell’s electrigal eff行iciency by over 10 percent.

选项 A size B shape C type D brand

答案 C

解析本句意思见上一题解析。A是“尺寸”，B是“形状”，C是“类型”，D是“商标”，所以答案是C。

分享到：

Better Solar Energy Systems: More Heat, More Light Solar photovoltaic (光电的）...

相关内容：Better,Energy,Systems,photovoltaic,光电

猜你喜欢

访问排行

联系我们