下载此文档

GRE阅读笔记no6-3.doc

文档分类：外语学习 | 页数：约14页举报非法文档有奖

1/14

下载提示

1.该资料是网友上传的，本站提供全文预览，预览什么样，下载就什么样。
2.下载该文档所得收入归上传者、原创者。
3.下载的文档，不会出现我们的网址水印。

同意并开始全文预览

(约 1-6 秒)

1/14 下载此文档

文档列表 文档介绍

heldbacklargelybyskepticismabout指示词 advertisers'claimsthatheatpumps canprovideasmanyastwounitsof(5)thermalenergyforeachunitofelec- tricalenergyused,thusapparently contradictingtheprincipleofenergy指示词 conservation. HeatpumpscirculateafluidSE(10)refrigerantthatcyclesalternatively fromitsliquidphasetoitsvapor , startingasalow-temperature,low- pressurevapor,pressor(15) pressor asahot,densevaporandflows throughaheatexchangercalledthe condenser,whichtransfersheatfrom(20) therefrigerant,asahigh-pressure, cooledliquid,confrontsaflowrestriction thepressurefalls,therefrigerant(25)expandsandpartiallyvaporizes, throughasecondheatexchanger,the evaporator,whichtransfersheatfrom theairtotherefrigerant,reducing(30)thetemperatureofthissecondbodyof ,oneis指示词 locatedinside,andtheotherone outsidethehouse,soeachisincontact withadifferentbodyofair:roomair≠(35)andoutsideair, throughaheatpumpiscontrolledby reversed,theheatexchangersswitch(40)-reversalcapability allowsheatpumpseithertoheator coolroomair. Now,ifundercertainconditionsa heatpumpputsoutmorethermalenergy>(45)thanitconsumesinelectricalenergy, hasthelawofenergyconservationbeen challenged?No,notevenremotely:theTS additionalinputofthermalenergyinto thecirculatingrefrigerantviathe(50)ountsforthedifference特殊短语、≠ intheenergyequation. Unfortunately,thereisonereal∨、SE、— heatpumpdecreasesastheoutdoor(55) iscausedbythelesseningamountof capacityisproportionaltothismass关系(60)flowrate:thelessthemassof关系 pressed,theless thethermalloaditcantransferthrough theheat- rateofrefrigerantvaporthroughthe(65)single-pressorusedin heatpumpsisapproximatelyconstant. pressorisatlowerpressurethan< war

GRE阅读笔记no6-3 来自淘豆网www.taodocs.com转载请标明出处.