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
2019-09-26
133
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.
Questions 66 ~ 70
Answer the following questions with the information given in the passage.
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/U58K777K
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
Goodmannersandetiquette(礼仪)arenotcomplicated.Anyonecan【D1】______courtesyandconsiderationforothers—thestuffofwhich
Aresearchersaysleadintheenvironmentcouldbeamajor【D1】______byyoungpeople.DoctorHerbertNeedlemanisaprofessorat
Aresearchersaysleadintheenvironmentcouldbeamajor【D1】______byyoungpeople.DoctorHerbertNeedlemanisaprofessorat
Bydegreestheshutterswereopened:thewindow-blindsweredrawnup,andpeoplebeganpassingtoand【C1】______.Somefewstoppe
Usingthisalphabet,youmusttrytoidentifyaregularpatterninthelettersgiven.Onceidentifiedyoumustcontinuethispat
FormanyyearsafterheformedhisTheoryofRelativity,AlbertEinsteinvisitedmanyuniversitiesindifferentcitieswherehe
In1859,CharlesDickenspublishedhishistoricalnoveloftheFrenchRevolutionentitled______.
FormanyyearsafterheformedhisTheoryofRelativity,AlbertEinsteinvisitedmanyuniversitiesindifferentcitieswherehe
在大城市寻找梦想的年轻人承受着巨大的生活压力。(8uffer…from)
HighintheMojavedesert,130milesnortheastofLosAngeles,liesavastfieldofmirrors.Crisscrossingrowsofglassandmet
随机试题
某控制系统中,为使控制作用具有预见性,需要引入()调节规律。
过错推定只适用于法律有特别规定的情形,而下列选项中不适用过错推定的是()。
如果速动比率为1.5,则支付前欠的购货款50万元,将会导致()。
甲公司为在上海证券交易所上市的A股公司,在2017年1月发布的2016年度利润分配及资本公积转增股本实施公告中披露的分配方案主要信息:每10股送2股(按面值发放),按未转股送股前股数每10股派发现金红利0.5元(含税),每10股转增4股。股权登记日:
法律规范可以分为授权性规范和义务性规范,根据这一分类标准,下列法律规范中,与“当事人依法可以委托代理人订立合同”属于同一规范类型的是()。
简述当前课程评价发展的基本特征。
王家村的祠堂长期被村民用来放置杂物,村里打算将其改成文化礼堂。但是很多村民有意见。为此村里召集村民召开恳谈会,如果由你主持,你会怎么说?现场模拟一下开场白。
给定资料1.有人撰文称:“以淘宝为代表的电子商务,正在一步一步摧毁实体经济。而造成这一切的罪魁祸首,就是互联网。”文中称:“淘宝的推出扼杀了中国很多产业的创新力。它造成了全国比价,进而无限压低利润空间,导致制造业凋零,‘中国创造
从全国人大到地方各级人大,从中央政府到地方政府,各级政府是各级人大的:
A、SebringHighSchool.B、ClarkHighSchool.C、MelroseCommunityCollege.D、CommunityCollege.C信息明示题。女士在最后指出,heenrolledinMel
最新回复
(
0
)