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1、半封闭螺杆冷水机组与开启式螺杆冷水机组比较项目半封闭螺杆冷水机组开启式螺杆冷水机组压缩机型式1，不需专门采用轴封，不存在冷媒泄露问题2，电机采用冷媒冷却，电机运行环境好，清洁度高，寿命长，运行温度不受外界环境的影响，而且始终保持较高的运行效率。3，机房无需专门的通风设备。1，需要专门采用轴封，不存在冷媒泄露问题2，电机采用空气冷却，电机运行环境差，清洁度低，寿命短，运行温度受外界环境的影响，运行效率低。3，机房需专门的通风设备。密封型式采用喷油密封压缩腔体，同时喷液态制冷剂以降低排气温度，提高机组
2、效率。无此装置，机组效率低。节流装置采用电子膨胀阀进行能量调节，调节精度高，机组在部分负荷下效率高。采用热力膨胀阀，调节精度低，同时部分负荷效率低油路润滑采用压差供油，无需油泵，油冷等外部连接件，系统简洁，无须进行维护采用油泵供油，需配置油泵，油冷等外部连接件，系统复杂，须每年进行维护机组设计采用2台压缩机设计，由于每台压缩机采用独立回路，当一台压缩机出现故障时，另一台仍可正常工作。单台压缩机独立系统，压缩机出现故障必须停机维修Semi-closedscrewchillerandopenedscr
3、ewchillercomparisonItemSemi-closedscrewchillerOpenedscrewchillerCompressortype1.withoutusingspecialsealequipment,andthereisnoquestionofrefrigerantleak2.themotorcooledbyrefrigerant,operatingingoodenvironment,cleanliness,longlife,besides,operatingtemper
4、aturewithoutexternalenvironmentalimpacts,andalwaysmaintainsahigheroperatingefficiency.3.theengineroomwithoutspecialventilationequipment.1.needforspecialsealequipment,andthereisnoquestionofrefrigerantleak2.themotorcoolesbyair,operatinginpoorenvironment
5、,cleanlinesslow,shortlife,besides,outsideenvironmentalaffactsoperatingtemperature,andlowoperatingefficiency.3.theengineroomrequiredspecializedventilationequipment.SealdevicetypeSealedbyinjectioncompressionchamber,andsprayliquidrefrigeranttoreducetheex
6、hausttemperature,andincreaseunit’sefficiency.Theabsenceofsuchadevice,andlowefficiency.ThrottleDevicesUsingelectronicexpansionvalveforenergyregulation,andtheunithashighefficiencyundersomeload.Usingthermalexpansionvalveforenergyregulation,andtheunithasl
7、oweffcicencyunderload.OilcircuitlubricationForusingoilpressuretosupplyoil,theunithasnopumps,oilcooling,andotherexternalconnections,andthesystemissimplewithoutmaintenance.Forusingoilpumptosuppplyoil,theunitmusthasconfiguredpumps,oilcooling,andotherexte
8、rnalconnections,andthesystemiscomplicated,subjectedtoannualmaintenance.UnitDesign2compressorsbydesign,thankstoeachcompressorusedindependentcircuit,whenacompressorfailure,anothercanstillworkproperly.展勤浩@139.comSinglecompressorindependentsystems
