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
41
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://kaotiyun.com/show/F1q7777K
0
大学英语四级
相关试题推荐
A、Rentinganapartmentfortheirtrip.B、Reservingaroominahotel.C、Buildingahouseontheshore.D、Choosingaroominabu
A、Howtoselectfruits.B、Howtokeephealthy.C、Howtohaveagoodsleep.D、Howtoprotecttheskin.B
Whatwouldittaketopersuadeyoutoexercise?A【S1】______toloseweightorimproveyourfigure?Tokeepheartdisease,cancer
AsaprofessoratalargeAmericanuniversity,Ioftenhearstudentssaying:"I’monlya1050."Theunluckystudentsarespeaki
IstheInternetMakingUsForgetful?AtouristtakesapictureoftheEmpireStateBuildingonhisiPhone,deletesit,then
Peopleintheirsixtiesshouldgotouniversitytoretrainbecausetheywillbeexpectedtoworkforlongerbeforeretirement,【C
Inmanycountries,authorityisseldomquestioned,eitherbecauseitishighlyrespected,orbecauseitis(1)_______.Sometime
A、Itlargelydependsonthemajors.B、Itisincreasingsharplyinrecentyears.C、Itisthesameforalltheundergraduates.D、I
Infuturetradethekeydevelopmenttowatchistherelationshipbetweentheindustrializedandthedevelopingnations.TheThir
Almosteverychild,onthefirstdayhesetsfootinaschoolbuilding,issmarter,more【B1】______,lessafraidofwhathedoesn
随机试题
王某与某保险公司签订了一份财产保险合同,在下列哪些情况下,该保险公司可以解除与王某的保险合同?()
Inthisfactory,suggestionsoftenhavetowaitformonthsbeforetheyarefully______.
ThetravelerlookslikeanEnglishman,buthisforeignaccentgavehim
Whenastudent,Iwasamemberofthecollegiatebasketballteam.Itwasmainlycomposedofbookishstudents.Onlyonecouldbe
影响疾病发生的环境因素主要有
腹部前后位摄影,影像中不可清晰显示的是
当归的主治病证是()熟地黄的主治病证是()
税务师受托为某建材商行编制2019年7月的增值税纳税申报表,建材商行系增值税一般纳税人,主营各类洁具的批发零售。已知建材商行当月增值税专用发票和机动车销售统一发票已通过增值税发票查询平台勾选确认或认证,2019年6月增值税纳税申报时,留抵税额为0元。无待抵
设f(x)=2x+3x一2,则当x→0时
程序progl.C的功能是:利用以下所示的简单迭代方法求方程cos(x)一x=0的一个实根。迭代公式:xn+1=cos(xn)(n是迭代次数)迭代步骤如下:(1)取x1初值为0.0。(2)x0=x1,把x1的值赋给x0。(3
最新回复
(
0
)