refrigerator.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,COPYRIGHT YUAN HAIYING,English for Electronic Technology,Passage Three,Refrigerators,Unite Two Electronic Products,Key points:,u,seful terms and the working principles of refrigerators,Difficult points:,d,escribing the working processes of a refrigerator,Requirements:,1.have a good command of the working principles of a refrigerators,2 describe the working processes of refrigerators,3.know some reading skills-form good reading habits,Leading in-,Revision,Talk about washing machines,Types of washing machines,Main Components of a washer,types,featuresWhirlpool,a pulsator forces the water to move like a whirlpool,Agitator Stirring,A propeller spins around and stirs the water,Drum Type,The drum turns.The clothes are picked up and dropped down by the protrusions,Centrifugal Force,the spinning drum pushes the water and detergent out through the wall of the inner drum.,New Words&Expressions,refrigerator rifridreit,-a piece of kitchen equipment which uses electricity to preserve food at a cold temperature,fridge frid,ice box,refrigerator-freezer,fridge-freezer,refrigerate ri,fridreit v.,冷藏,使冷,vt.,冷冻,冷藏,refrigeration ri.frid,rein n.,冷却,冷藏,冷冻,refrigerant ri,fridrnt,n.,制冷剂,冷冻剂,-a compound used in a heat cycle that undergoes a phase change from,Pictures of refrigerators,New Words&Expressions,vapor,veip n.,蒸汽,vaporize v.veipraiz v.(,使,),蒸发,vaporization:,.veiprai,zein n.,蒸发,汽化,evaporate:,i,v,preit v.,蒸发,失去水分,evaporation:,i.v,prein,n.,蒸发,脱水,干燥,evaporator:,i,v,preit n.,蒸发器,condense/kndens/v.,浓缩,冷凝,condenser kn,dens,n.,凝结器,凝缩器,冷却器,condensation kndensein n.,压缩,凝缩,液化,What is vaporization?,When you go to the doctors to get your shots(injections),the nurse usually wipes alcohol on your arm with a cotton ball before she puts the needle into your arm,when she does that,that part of your arm feels really cool.The reason why it feels cool is that when liquid alcohol turns into vapor(a process called vaporization),it steals the heat away from the skin on that part of your arm.The heat leaving your skin is called vaporization heat,。,get shot,alcohol n.,lkhl,酒精,wipe(v.,擦,),Vaporization and condensation,water,is heated,turns into,vapor,changes into,vapor,gives off heat,water,Heat is absorbed by water,Cool air steals away the heat for the water vapor,New Words&Expressions,compress /kmpres/,to press something into a smaller space,squeeze,skwi:z,v.,紧握,挤,to press something firmly,especially from all sides in order to change its shape,reduce its size or remove liquid from it,compressor km,pres n.,压缩物,压缩机,expansion iks,p,nn n.,扩大,膨胀,expand:,iksp,nd,v.,使,.,膨胀,详述,扩张,valve v,lv n.,阀门,expansion valve,膨胀阀,Components of a refrigerator,evaporator,compressor,condenser,capillary pipe,毛细管,Components of a refrigerator,Refrigerant,compressor,expansion valve(flow control device),evaporator,condenser,pipes,Refrigeration cycle of a refrigerator,Heat drawn from the warmer refrigerator compartment causes the refrigerant liquid to vaporize,The vaporization heat taken away at this point is what cools the refrigerator,A compressor squeezes the refrigerant gas,heating it and forcing it through the system,The gas cools and condenses in the condenser,giving up its heat to the outside air.,The liquids pressure is lowered,About CFC free refrigerator,CFC,chlorofluorocarbon,氟氯碳,-a gas used in fridges and,in the past,CFCs cause damage to the ozonen(,uzun,u,z-.,臭氧,)layer,The ozone-friendly and climate-friendly refrigerator uses no chlorofluorocarbons(CFCs)or even fluorocarbons(FCs).,Read unit two/passage three by the students,Notes:,figure sth/sb out-to finally understand something or someone,or find the solution to a problem after a lot of thought,steal away-to do something quickly or without being noticed,SC-50 50L Mini Refrigerator,Key Specifications/Special Features:,Capacity:50L,Rating power:80W,Voltage:220/110V AC,Power consumption:0.65kW/24hr,Net/Gross weight:19/21kgs,Rated frequency:50/60Hz,Products size:47 x 53.4 x 49cm,Packing size:51.5 x 56 x 52cm,Container loading:20,40 and 40-foot HQ container 176,368 and 455 units,Refrigerant:R134a,Shelves:one-shelf,Color:white(other color for option),Inside temperature:0 to 10 degree Celsius in the ambient temperature 25 degree Celsius,Thermostat:mechanical thermostat adjustable,Homework-translate it into Chinese,