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1、摘要R22（CHF2Cl，二氟一氯甲烷）是目前应用十分普遍的一种制冷剂，其ODP为0.034，GWP为1700，由于它含有氯原子，对臭氧层有破坏作用，即将被禁用。从对环境的长期影响来看,自然工质比合成工质具有不可比拟的优势，比如R1270（俗称丙烯）。丙烯优点是易于获得，价格低廉，凝固点低，对金属不腐蚀。丙烯可燃,消耗臭氧潜能值为零,环保性能好，对人体的毒性也近于零毒性，饱和蒸汽压接近R22。丙烯的单位容积制冷量和COP与R22接近,压缩比和排气温度也低于R22，这有利于提高压缩机的运行寿命。随着科学不断地发展，新型制冷剂将逐步取代R22等对环境有破坏的制冷剂。本文的容是设计出
2、以R1270为工质的分体式家用空调器，制冷量为3500W。首先选以R22作工质的压缩机型号，我选择的的型号是SL211CV,然后进行热力计算，算得制冷量为3747W，冷凝热负荷为4707W。冷凝器的迎风面积为0.3957m2，蒸发器的迎风面积为0.4997m2。节流装置选用直径2mm，长1.46m的毛细管，最后用SolidWorks绘制室外机三维图。关键词：R22，R1270，替代工质，空调，设计ABSTRACTR22(CHF2C)isaverycommonapplicationofrefrigerant,theODPis0.034,GWPis1700,becauseitcon
3、tainschlorineatoms,hasdamagingeffectsontheozonelayer,isabouttobedisabled.Fromlong-termimpactontheenvironment,thesynthesisofnaturalrefrigerantthanrefrigeranthasunparalleledadvantages,suchasR1270(commonlyknownaspropylene).Propyleneadvantageofeasyaccess,lowcost,lowfreezingpoint,non-corrosivemet
4、al.Propyleneflammable,zeroozonedepletingpotential,goodenvironmentalperformance,thetoxicityofthehumanbodymaybeclosetozerotoxicity,saturationvaporpressureclosetoR22.PropylenerefregerationunitvolumeandtheR22andCOPclosetothecompressionratioandexhausttemperatureisalsolowerthantheR22,whichisconduc
5、ivetoenhancetheoperationallifeofthecompressor.Withthecontinuousdevelopmentofscience,thenewrefrigerantR22willbegraduallyreplacedbydamagetotheenvironment,suchasrefrigerants.ThisarticleisdesignedfortheworkingfluidintheR1270homesplitairconditioners,refrigerationcapacityof3500W.Firstelectedtocond
6、uctaqualitativeR22compressormodels,IchosetomodelistheSL211CV,andthenproceedtotheheat,thecoolingcapacitycanbesaidforthe3747W,condensingheatloadof4707W.Condenserareaofthewind0.3957m2,evaporatorareaofthewind0.4997m2.Selectionofcuttingdevicediameter2mm,lengthofcapillary1.46m,andfinallywithSolidW
7、orksofthree-dimensionalgraphdrawingoutdoorunit.Keywords：R22，R1270，substitute，airconditioning，project常用符号表A面积，m2L长度，mr热阻，半径，气化潜热，℃/W，m，J/kgd直径，含湿量，m，g/kgα换热系数，W/(m2·K)T温度，℃ρ密度，kg/m3u流速，m/sμ动力粘度，kg/(m·s)Cp比热容，kJ/(kg·℃）λ导热系数，W/(m2·℃)Q热量，Jυ运动粘度，m2/sV风量
