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
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the building
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the building
admin
2014-12-31
26
问题
These days, many large city buildings are equipped with their own air-conditioning systems. These systems help keep the buildings cool, but they can also damage the environment. Since they use a lot of electricity, for instance, they contribute indirectly to global warming. In addition, the water that flows through the systems is often cooled using chemicals called chlorofluorocarbons, or CFCs, that are believed to damage the Earth’ s ozone layer. Recently, though, a system has been built in the city of Toronto, Canada, that cools buildings with little damage to the environment.
In the traditional air-conditioning systems found in most large buildings, water is pumped through the building in a continuous cycle. The water is first cooled to a temperature of 4°C in machines called chillers. It is then sent to individual units that cool the air in each room. As the water flows through the building, it gradually becomes warmer. Finally, it reaches the roof, where it is left to cool down naturally in a water tower. After that it is returned to the chillers, where the cycle begins again.
Toronto lies on the shore of Lake Ontario, one of North America’s Great Lakes, and the new system makes use of cold water taken from about 80 meters below the surface of the lake. At this depth, the water in the lake remains at 4°C all year round. This is exactly the temperature to which the water in air-conditioning systems is cooled. However, the water from the lake is not pumped directly into the air-conditioning systems. Instead, it is used to cool the water that is already inside the air-conditioning systems. After that, the lake water is added to the city’s ordinary water supply.
Enwave, the company that developed this deep-lake cooling system, says that it uses 75 percent less energy than traditional air conditioning. And since no CFCs are used, no damage can be caused to the ozone layer. Not every city is located next to a large lake, but experts believe that systems like the one being used in Toronto could be built elsewhere by using other natural sources of cold water.
What is the function of the chillers in a traditional air-conditioning system?
选项
A、They pump the air continuously to the units in each room.
B、They lower the temperature of the water in the system.
C、They help the water cool down naturally on the roof.
D、They gradually clean the water as it flows through the building.
答案
B
解析
细节题。短文第二段指出The water is first cooled to a temperature of 4℃ inmachines called chillers.即chiller的作用就是制冷。故选B。
转载请注明原文地址:https://jikaoti.com/ti/mq4FFFFM
0
大学英语四级
相关试题推荐
A、Rentinganapartmentfortheirtrip.B、Reservingaroominahotel.C、Buildingahouseontheshore.D、Choosingaroominabu
A、How"GreatAmericanDream"isbroken.B、Fiercecompetitionintheworkplace.C、Worshiponmoneyandsocialstatus.D、Thecruel
GlobalWarmingGlaciersaremelting,sealevelsarerising,cloudforestsaredrying,andwildlifeisscramblingtokeeppac
Amidasummerofrecord-settingheat,anewsurveyfindsthatmostofGenerationX’s(20世纪60年代到70年代初出生的美国人)youngandmiddle-agea
A、Becausehewaslockedupinamentalhospital.B、Becausehehaddifficultiesinwalking.C、BecausehelivedfarawayfromOxfo
A、Henryisabookworm.B、Henryisagoodstudent.C、Henry’slearningstyleisimproper.D、Henry’slearningstyleisjustasbefo
IstheInternetMakingUsForgetful?AtouristtakesapictureoftheEmpireStateBuildingonhisiPhone,deletesit,then
Readingisanimportantskillthatneedstobedevelopedinchildren.Notonlyisitnecessaryfor【S1】______intheworldofscho
Inmanycountries,authorityisseldomquestioned,eitherbecauseitishighlyrespected,orbecauseitis(1)_______.Sometime
Infuturetradethekeydevelopmenttowatchistherelationshipbetweentheindustrializedandthedevelopingnations.TheThir
随机试题
A.十二指肠球部溃疡B.胃溃疡C.幽门管溃疡D.球后溃疡E.复合溃疡抑酸,胃黏膜保护治疗6~8周
流感疫苗接种的禁忌对象为
患者男性,56岁。胃溃疡病l0年。现胃痛隐隐,喜温喜按,畏寒肢冷,泛吐清水,腹胀便溏,舌淡胖,边有齿痕,苔白,脉迟缓。治疗方剂是()
A、代谢加速而导致意外怀孕B、子宫内膜突破性出血C、抑制排酸作用D、代谢加快而失效E、凝血酶原时间延长,增加出血倾向甲地孕酮与利福平合用()。
根据《药品经营许可证管理办法》,由原发证机关注销《药品经营许可证》的情形不包括
主动测量是指()。
在报关程序中,前期阶段的适用范围包括()
张某为其3岁儿子购买某品牌的奶粉,小孩喝后上吐下泻。经鉴定,该品牌奶粉属劣质品。张某的亲友们提出的下列建议中,不违反法律规定的有()。
Haveyounoticedhowcertainindustriesmovetogether?Forexample,oneairlineintroducesaparticularserviceandeveryother
Weoftentendtoassociatesmilingastheresultofapositiveeventormood.Butresearchdemonstratesthattheactofsmiling,
最新回复
(
0
)