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1、10•翻译:1・Vaporcompressionrefrigerationsystemiscomposedbycompressor,condenser,expansionvalveandevaporator,connectedwithpipelinetoformanenclosedsystem.Refrigerantchangesheatwithsubstaneetobecooledinevaporato匚Refrigeratorabsorbsheatfromsubstancetobecooledandevaporated・Thecompr
2、essordrawsthelowpressurevaporinitssuctionsideandthencompressedittohighpressurebeforedischarge.2.Duringthecycle,compressor,whichisheartofthesystem,playsapartincompressingandtransportingrefrigerantvaporandcausinglowpressureinevaporatorandhighpressureincondense匚Flowcontrolval
3、vethrottlesrefrigerantflowtoreduceitspressureandregulatesrefrigerantflowrateofenteringevaporator.Evaporator,whichisanequipmentofrefrigeratingeffectoutput,refrigerantabsorbsheatformsubstancetobecooledtorealizerefrigerating.Condenser,whichisanequipmentofheatoutput,coolantini
4、ttakesawayheatfromrefrigerantandheatfromtheworkconsumedbycompressor.3・Inliquidevaporatingrefrigeratingsystems,refrigerantisrequiredtoevaporateatlowtemperature.Itabsorbsheatfromobjectstobecooled.Thencondensesathighertemperatureanddischargesheattoenvironmentmeanwhile・Therefo
5、re,onlythoseevaporateandcondensewithinrangeofworkingtemperaturecanbeusedasrefrigerants・Mostrefrigerantsareingaseousstateatnormaltemperatureandpressure.4.Mixedrefrigerantiscomposedbytwokindsormorepurerefrigerants・Duetolimitationtotypeandperformanceofpurerefrigerants,mixture
6、ofrefrigerantoffersmorefreedomtomodulateperformanceandamplifychoiceofrefrigerant.9翻译1・Boilerisakindofheatexchangedevicewhichturnschemicalenergyandexcessheatfromindustrialproductionprocessorotherheatsourceintosteamorhotwaterwithcertaintemperatureandpressure・2.Accordingtohea
7、ttransferfeaturesofboiler,industrialboilerheatsurfacecanbedividedintoradiantheatsurfaceandconvectionheatsurface.Radiantheatsurfaceisthatportionofsurfaceofbeinglocatedincombustionchamberandreceiveradiantheat.ManlymeanswatercooledwalkConvectionheatsurface,locatedinboilerflue
8、,isthatportionofsurfaceswasheddirectlybyhightemperaturefluegastotransferheatbyconvection・
