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
Geothermal(地热的)energy has been used for thousands of years in some countries for cooking and heating. It is simply power derived
Geothermal(地热的)energy has been used for thousands of years in some countries for cooking and heating. It is simply power derived
admin
2017-04-29
79
问题
Geothermal(地热的)energy has been used for thousands of years in some countries for cooking and heating. It is simply power derived from the Earth’s internal heat. This thermal energy is contained in the rock and fluids beneath Earth’s crust. It can be found from shallow ground to several miles below the surface, and even farther down to the extremely hot molten rock called magma(岩浆).
A geothermal heat pump system can take advantage of the constant temperature of the upper ten feet(three meters)of the Earth’s surface to heat a home in the winter while extracting heat from the building and transferring it back to the relatively cooler ground in the summer. Geothermal water from deeper in the Earth can be used directly for heating homes and offices, or for growing plants in greenhouses. Some US cities pipe geothermal hot water under roads and sidewalks to melt snow.
To produce geothermal-generated electricity, wells, sometimes a mile(1.6 kilometers)deep or more, are drilled into underground reservoirs to tap steam and very hot water that drive turbines linked to electricity generators. The first geothermally generated electricity was produced in Larderello, Italy, in 1904.
There are three types of geothermal power plants: dry steam, flash, and binary(二元的). Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine. Flash plants pull deep, high-pressure hot water into cooler, low-pressure water. The steam that results from this process is used to drive the turbine. In binary plants, the hot water is passed by a secondary fluid with a much lower boiling point than water. This causes the secondary fluid to turn to vapor, which then drives a turbine. Most geothermal power plants in the future will be binary plants.
There are many advantages of geothermal energy. It can be extracted without burning a fossil fuel such as coal, gas, or oil. Geothermal fields produce only about one-sixth of the carbon dioxide that a relatively clean natural-gas-fueled power plant produces. Unlike solar and wind energy, geothermal energy is always available, 365 days a year. It’s also relatively inexpensive; savings from direct use can be as much as 80 percent over fossil fuels.
But it has some environmental problems. The main concern is the release of hydrogen sulfide(硫化氢), a gas that smells like rotten eggs at low concentrations. Another concern is the disposal of some geothermal fluids, which may contain low levels of toxic materials. Although geothermal sites are capable of providing heat for many decades, eventually specific locations may cool down.
What is essential to the operation of a geothermal heat pump system?
选项
A、The energy in hot molten rock called magma.
B、The energy in rock and fluids far beneath the Earth’s crust.
C、Geothermal water from deeper in the Earth.
D、The constant temperature of the Earth’s upper layer.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/ZCU7777K
0
大学英语六级
相关试题推荐
EdgarPoe,anAmericanwriter,wasbornin1809.Hisparentswereactors.Edgarwasababywhenhisfatherleftthefamily.Hew
EdgarPoe,anAmericanwriter,wasbornin1809.Hisparentswereactors.Edgarwasababywhenhisfatherleftthefamily.Hew
WilmaSubrahadnointentionofbecomingapublicspeaker.After【B1】______fromcollegewithdegreesinchemistryandmicrobiolog
A、Becausetheycan’taffordto.B、Becausetheythinksmallhousesaremorecomfortabletolivein.C、Becausebighousesareusua
A、BecauseheusedtoliveinFrance.B、BecausehelikeschattingwithFrenchpeople.C、BecausehestudiesFrenchatschool.D、Be
A、Becausetakingthesubwayisfasterthoughlessdirect.B、Becausetakingthesubwayislessexpensive.C、Becausetakingthebu
A、Stopthinkingaboutthematter.B、Talkthedruguseroutofthehabit.C、Bemorefriendlytohisschoolmate.D、Keephisdistan
Insomewaystheemploymentinterviewislikeapersuasivespeechbecausetheapplicantseekstopersuadetheemployertoemploy
America’smostpopularnewspaperwebsitetodayannouncedthattheeraoffreeonlinejournalismisdrawingtoaclose.TheNewY
Whenyouthinkaboutthegrowthofhumanpopulationoverthelastcenturyorso,itisalltooeasytoimagineitmerelyasani
随机试题
全国人大常委会在本届人大任期届满的()以前必须完成下届全国人大代表的选举
动脉粥样硬化的早期病变中,最早迁入内膜的细胞是()
毛细血管壁增厚呈双轨状或分层状见于
患儿,11个月,近1个月面色渐苍白,该患儿出生时为足月顺产,生长发育正常,未患过任何疾病,母乳喂养,其母孕期和哺乳期身体均健康,该患儿经检查诊断为缺铁性贫血,其缺铁的主要原因是什么
A.赖诺普利B.福辛普利C.缬沙坦D.卡托普利E.替米沙坦分子中不含四氮唑基的ARB是
产生经济纠纷,双方协商解决不了时,不可由()解决
在普通车床的主要结构中,丝杆是专门用来车削()而设置的。
银行市场定位时只能采用一种策略。()
下列不属于NASA的科学家小组宣布的“4条证据”的一项是()。文中[]应填入的词语是()。
任何一本所有批评家赞许的作品都被每个文学工作者所读过,并且任何一个读过点什么的都将谈论到它,任一个批评家都将赞许那些推崇批评家本人的人的任一作品,张因铣推崇每位批评家。由此可见()。
最新回复
(
0
)