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1、制冷系统组成Vapor-Compression Refrigerationexpansionexpansion devicedevicecondensercondensercompressorcompressorevaporatorevaporator第一部分 制冷循环制冷系统组成AB压力压力焓焓蒸发蒸发制冷循环ACcompressorcompressorpressurepressureenthalpyenthalpyevaporatorevaporator制冷循环BAcondensercondenserpressurepressureenthalpyenthalpyevaporatoreva
2、porator制冷循环BCcompressorcompressorDexpansionexpansion devicedeviceADcondensercondenserpressurepressureenthalpyenthalpyevaporatorevaporator制冷循环BCcompressorcompressor第二部分 冷凝器制冷系统组成subcoolersubcooleroutdoor outdoor airair condenser condenser coilcoilpropellerpropeller fanfan风冷式冷凝器ADpressurepressureentha
3、lpyenthalpyBCEffect of SubcoolingAIsubcoolingsubcoolingrefrigerationrefrigeration effecteffectDI离心式风扇-风冷式冷凝器centrifugalcentrifugal fanfancondenser condenser coilcoil蒸发式冷凝器sumpsumppumppumpcondenser condenser coilcoilrefrigerant refrigerant vaporvaporsubcoolersubcoolerfanfanliquid refrigerantliquid re
4、frigerantcooling watercooling watersubcooledsubcooled, liquid , liquid refrigerantrefrigerantsubcoolersubcooler水冷式冷凝器hot, refrigerant vaporhot, refrigerant vapor29C35C冷却塔spraysspraysfrom from condensercondenserto to condensercondensersumpsumppropellerpropeller fanfanoutdooroutdoor airair29C35Cfillfi
5、ll冷凝器控制sCondenser capacity is influenced by:uTemperature difference between refrigerant and cooling mediauFlow rate of cooling media through condenseruFlow rate of refrigerant through condenserpressurepressureenthalpyenthalpyfull load full load condenser heat condenser heat rejection capacity reject
6、ion capacity part loadpart loadfull loadfull loadCondenser Capacitypart load part load condenser heat condenser heat rejection capacity rejection capacity 冷凝温度控制condenser condenser water pumpwater pumpflow-regulating flow-regulating valvevalvecondensercondenser可变冷凝器水流量cooling towercooling towerconde
7、nsercondenservariable-speed variable-speed drivedrivecondensercondensercooling towercooling towerbypass pipebypass pipediverting diverting valvevalvecooling towercooling towercondensercondenservariable- variable- speed speed drivedrivecondensercondensercooling towercooling towerbypass pipebypass pip
8、ediverting diverting valvevalve可变进水温度condensercondenserbypass pipebypass pipecooling towercooling tower冷却塔旁通divertingdiverting valvevalve4C18C13C风冷式冷凝器控制heat rejection capacityheat rejection capacitycondenser airflowcondenser airflowfan fan Afan fan Bfan fan AdamperdamperAB冷凝器溢流控制evaporatorevaporato
9、rcompressorcompressorliquid receiverliquid receiverBACcondensercondenserexpansionexpansion valvevalvedischarge linedischarge line第三部分 蒸发器制冷系统组成Finned-Tube Evaporatorrefrigerant vapor refrigerant vapor liquid/vapor liquid/vapor refrigerantrefrigerantairflowairflowTurbulent FlowFinned-Tube Evaporatorl
10、iquid/vapor liquid/vapor refrigerantrefrigerantrefrigerant vaporrefrigerant vaporliquidliquid distributordistributorairflowairflowsuctionsuction headerheaderSuperheatsuperheatsuperheatACBACBShell-and-Tube Evaporatorrefrigerant refrigerant vapor vapor chilled chilled water water returnreturnchilled c
11、hilled water water supplysupplytube bundletube bundlebafflesbafflesliquid/vapor liquid/vapor refrigerantrefrigerantShell-and-Tube EvaporatorbafflesbafflesEvaporator ControlsEvaporator capacity is influenced by:uTemperature difference between refrigerant and air or water being cooleduFlow rate of air
12、 or water through evaporatoruFlow rate of refrigerant through evaporatorFinned-Tube Evaporator Controlexpansion expansion valvevalverefrigerant refrigerant vaporvaporevaporatorevaporatorliquid liquid refrigerantrefrigerantFace-Split ArrangementdistributorsdistributorsFace-Split Arrangement27C-1.1C13
13、Cinactive coilinactive coilactive coilactive coil27CIntertwined ArrangementRow-Split ArrangementRow-Split Arrangement27C13C21CShell-and-Tube Evaporator Controlrefrigerant refrigerant vaporvaporliquid liquid refrigerantrefrigerantexpansion expansion valvevalveshell-and-tubeshell-and-tube evaporatorev
14、aporator第四部分 膨胀装置制冷系统组成膨胀装置expansionexpansion devicedeviceADcondensercondenserpressurepressureenthalpyenthalpyevaporatorevaporatorBCcompressorcompressor热力膨胀阀热力膨胀阀热力膨胀阀 (TXV)(TXV)液汽混合物液汽混合物制冷剂气制冷剂气 体体蒸发器蒸发器A液体制液体制 冷剂冷剂TXV Controlliquid/vapor liquid/vapor mixturemixturerefrigerant refrigerant vaporvap
15、orAliquid liquid refrigerantrefrigerantTXV Controlliquid/vapor liquid/vapor mixturemixtureliquid liquid refrigerantrefrigerant过热superheatedsuperheated vaporvaporTXVTXV2 MPa, 42.8C0.59 MPa, 5CAliquid liquid refrigerantrefrigerant过热TXVTXV9.4C0.54 MPa2 MPa, 42.8C0.59 MPa, 5CTXV Operationexternal equali
16、zerexternal equalizerremote remote bulbbulbevaporatorevaporatorspringspringsuction suction linelinedistributordistributordiaphragmdiaphragmTXV Operationvalve pinvalve pinsuction suction linelinespringspring94C0.54 MPa0.67 MPa0.54 MPa0.13 MPavalve diaphragmvalve diaphragmTXV OperationTXVTXVexternal equalizerexternal equalizerremoteremote bulbbulbABCSuperheat SettingsToo little superheat:uRisk of damage to compressor by liquid re
