首页
登录
职称英语
Geothermal(地热的)energy has been used for thousands of years in some countries
Geothermal(地热的)energy has been used for thousands of years in some countries
游客
2023-08-16
31
管理
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. [br] Two types of water with different pressures and temperatures are used to generate the steam in______.
选项
A、flash plants
B、dry steam plants
C、turbine-driven plants
D、binary plants
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2929732.html
相关试题推荐
Geothermal(地热的)energyhasbeenusedforthousandsofyearsinsomecountries
Geothermal(地热的)energyhasbeenusedforthousandsofyearsinsomecountries
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
Thousandsofstudents,facultyandstaffboycottedclassesandstagedrallie
随机试题
Ahotelislikeaself-containedcommunityprovidingguestswithalltheservice
【S1】[br]【S2】great→small由语意可知,新发明早期由于昂贵,很难使用,加上可能不安全,所以其经济影响力应该是很小的。
WhichisNOTafactorindicatedforthelikelyextinctionofsomelanguages?[or
在薪酬业务循环审计中,可以采用观察方法审查的是:A.薪酬总额的计算是否正确 B
浆砌排水沟基础缩缝应与墙身缩缝对齐。()
某开发企业申请贷款6000万元,由其拥有的商品房做抵押,该企业信用等级为AA级,
为了掌握市场信息,有效安排生产运营,某冷饮生产安全企业进行了市场调查和市场预测活
(2017年真题)某男,42岁。自诉感冒数日,恶寒渐轻,身热增盛,无汗头痛,目疼
(2013年真题)在相关分析中,如果两个变量间Pearson相关系数r=0,这表
张某欠李某2万元尚未偿还,李某欠刘某2万元也未偿还,刘某多次要求李某偿还债务无果
最新回复
(
0
)