首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
High in the Mojave desert, 130 miles northeast of Los Angeles, lies a vast field of mirrors. Crisscrossing rows of glass and met
High in the Mojave desert, 130 miles northeast of Los Angeles, lies a vast field of mirrors. Crisscrossing rows of glass and met
admin
2021-12-29
65
问题
High in the Mojave desert, 130 miles northeast of Los Angeles, lies a vast field of mirrors. Crisscrossing rows of glass and metal, glinting in the sunlight, cover a full square mile of dirt. It is a fully operational array of power plants churning out an average of 180 megawatts of electricity.
Most people think of solar power as a flat panel on every rooftop. But photovoltaic panels have limitations. They work fine when the sun is strong, but when the clouds roll in you’ d better have batteries to run the TV and dishwasher. And even on the sunniest days the panels are not very well suited for cities, where roof space is limited.
For decades, engineers have been working on ways to catch the sun over a broad area concentrating it and using it to produce electricity on the same scale as centralized coal, hydro or nuclear power plants—hundreds of megawatts at a time. Several pilot plants have been operating in California, some for decades, but so far they have not had enough volume to force costs down to competitive levels.
Some countries are expected to go with much larger plants capable of generating more than 100 megawatts each. If some of the projects are completed, costs could come down from the current 15 cents a kilowatt-hour for the Mojave plant to 8 cents per kwh in the next 8 to 10 years. That would go a long way toward closing the gap with gas and oil, which now cost as little as 4 cents per kwh.
The Mojave plant is one of the world’s first commercial solar power plants, with five solar Electric Generating Systems (SEGS) supplying electricity to southern California. The basic component of a SEGS plant is a row of mirrors that reflect sunlight onto a pipe filled with oil. The oil heats up and is used to produce steam, which turns an electrical turbine. Assemble a few dozen rows of these trough-mirrors, and you have got capacity to generate 30 megawatts of power, enough for half a small town. The problem with trough technology is that the oil loses its heat too quickly. When the sun goes down, so does the power.
A Solar Tres design uses molten salt instead of oil. Since salt holds more heat longer than oil, it can drive turbine through the night. Concentric rings of mirrors direct sunlight to a tank of molten salt. When the stuff is hot enough, some goes straight to a generator to produce steam, while the rest is stored for use at night. The 15-megawatt Solar Tres plant would be the first long-term commercial power production project. Since the electricity is expected to be costly close to 20 cents per kwh, the Spanish government plans to subsidize the plant.
The next big thing—Dish systems—is already in the works. The building block of such a plant is a parabolic mirror, shaped like a satellite dish, that reflects sunlight onto a small generator suspended in front. The heat drives a turbine. Theoretically a dish configuration would produce more energy per acre than other solar concentrating plants, that is, if engineers could figure out a good way of linking many dishes together.
What kinds of solar power plants are mainly mentioned in the passage?
选项
答案
Mojave plant, Solar Tres design and Dish systems.
解析
文章第五、六、七段分别介绍了三种太阳能电厂,分别是Mojave plant, Solar Tres design and Dish systems.由此可知本题答案。
转载请注明原文地址:https://kaotiyun.com/show/Ea8K777K
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
Identifythefollowingshapesandmarktheoddoneout.
Fillinthebracketsinthesecondlinetoformaword,usingthelettersoutsidethebrackets.e.g.ET(J__I__R)PU→ET(JUP
ThechartbelowshowsthenumbersofChinesetouristsvisitinginBritain.Writeareportoftheinformationshownbelowabout1
Whichthree-letterword,whenplacedinthebrackets,formstwodifferentwords;onewiththeletterontheleftoutsidethebra
Findthemissingnumber.
Youarelookingforonewordinthisparagraph.Thewordappearsonlyonce,itsfirstletteristheeighthletterwhichappears
Surfingissomethingpeopleoftengethookedonaftertryingitafewtimes.Formanysuffersitismuchmorethanahobby—they
HighintheMojavedesert,130milesnortheastofLosAngeles,liesavastfieldofmirrors.Crisscrossingrowsofglassandmeta
HighintheMojavedesert,130milesnortheastofLosAngeles,liesavastfieldofmirrors.Crisscrossingrowsofglassandmeta
HighintheMojavedesert,130milesnortheastofLosAngeles,liesavastfieldofmirrors.Crisscrossingrowsofglassandmeta
随机试题
计算。
关于优质X线图像质量标准的叙述,说法错误的是
男,35岁。稍长时间步行后感右小腿疼痛,肌肉抽搐而跛行,稍休息后症状消失。平时感右足发凉,怕冷,有麻木感。右足背动脉搏动减弱。应考虑()
某沥青混合料物理力学指标测定结果如下,请回答以下问题。标准配合比的矿料合成级配中,至少应包括()筛孔的通过率接近优选的工程设计级配范围的中值。
下列关于金融业营业税计税营业额的确定方法中,符合营业税法律制度规定的是()。
下面哪种不是打印整个文档的方法?()
当导游员遇到故意找碴的领队时,正确的做法是()。
一般资料:求助者,女性,16岁,高中一年级学生。案例介绍:求助者小时候经常听奶奶讲鬼的故事,三个多月前睡觉时做梦,梦见一个穿白衣的女鬼缠着自己,非常害怕,当时被吓醒,一直哭到天亮。同宿舍有些同学也说梦见过鬼,说鬼魂会附体。求助者很害怕,就开始走读,
2013年我国车辆和驾驶人保持快速增长,至2013年年底,全国机动车数量突破2.5亿辆,全国机动车驾驶人数量近2.8亿人。其中,我国汽车保有量达1.37亿辆,是2003年汽车保有量的5.7倍,扣除报废量,增加1651万辆,增长了13.7%,占全部机动车的比
20世纪40年代末,韦弗尔提出了神经齐射理论。不过他也指出,适用于神经齐射原则分析的声音频率不超过()
最新回复
(
0
)