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
2023-01-16
99
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.
Theoretically, what is the advantage of dish configuration compared with other solar concentrating plants?
选项
答案
It can produce more energy per acre.
解析
文章最后一段提到,从理论上讲,一个碟形形状每英亩产生的能量比其他太阳能工厂要多。由此可知本题答案。
转载请注明原文地址:https://kaotiyun.com/show/FWSD777K
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
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,therefore,thechoiceofan【C1】________shouldbemad
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,therefore,thechoiceofan【C1】________shouldbemad
BradSetser,aneconomistattheCouncilonForeignRelations,istheauthorofanewdiscussionpaperlookingat"thereturnof
Howmanyofarandomstringofnumbers—say1593657292759381380473—doyouthinkyouwillbeabletoimmediatelyremember?Somesc
Whatisitaboutwalking,inparticular,thatmakesitsoamenabletothinkingandwriting?Theanswerbeginswithchangestoou
FewwritersareasreveredasJaneAusten.AccordingtoapollinMarch,PrideandPrejudice—aromancewithoutasinglekiss—is
Jonny:Hey!I’mjustpracticingTaiChi(太极).Wouldyouliketojoinme?Peter:Iknownothingaboutit.Isitdifficult?
WhogaveLilyflowers?
Theinitial,widelysharedpessimismturnedouttobe________,becauseitignoredthemanythingsthatwouldbedonewithresour
Check-inRequirements Passengersandtheirbaggagemustbechecked
随机试题
_______和_______是计划的两大显著特征。
散文《爱尔克的灯光》的作者是
Weareall______athis______success.
女性,28岁。因“服用敌敌畏30ml后出现呕吐、出汗、呼吸困难、流涎及意识不清2h’被人送医院急救。本例患者经过治疗后中毒症状完全消失,但在中毒第16天时开始出现手足麻木、无力。你认为可能原因是
下肢静脉曲张病人手术前应做的深静脉通畅试验,又称
下列用于治疗流行性结膜炎的非处方药有()。
吊顶工程对人造木板必须复验的项目是()。
行权价格低于标的物市场价格的看涨期权是( )。
客户融券期间,其本人或关联人卖出与所融人证券相同的证券的,客户应当自该事实发生之日起()个交易日内向证券公司申报。
某公司拟新建一车间用以生产受市场欢迎的甲产品,据预测甲产品投产后每年可创造100万元的收入;但公司原生产的A产品会因此受到影响,使其年收入由原来的200元降低到180万元。假设不考虑所得税,则与新建车间相关的现金流量为()万元。
最新回复
(
0
)