外文翻译中央空调监控系统中温湿度控制的相关问题分析.docx

外文翻译中央空调监控系统中温湿度控制的相关问题分析.docx

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外文翻译中央空调监控系统中温湿度控制的相关问题分析

附　录

附录A　外文翻译

TheAnalysisonRelatedProblemsofTemperaure-humidityControlforMonitoringSystemofCentralAir-condition

1Introduction

"Greenbuilding"focusonenvironmentalprotection,energysaving,efficientuseofresourcesandmaterials,especiallyfocusonrequirementsforairtemperature,humidity,ventilationandcleanliness.Therefore,theuseofairconditioningsystemismorewidely.Air-conditioningcontrolsysteminvolvesmanyaspects,butmorecomplextaskstobeachieved.Itneedssupportofcoldandheat.Therearehigh-powerairconditioningunitfan,butit'sagreatenergy.Underthepremiseofmeetingtherequirementsofuserstoairenvironment,onlytheuseofadvancedcontrolstrategiestocontrolair-conditioningsystem,canachieveenergyconservationandreducecostofoperation.Thefollowingwillmakeabriefdiscussionaboutperspectiveproblemswiththemonitoringsystemfromcontrolstrategy.

2system'sbasicstructureandworkingprinciple

Structureandcompositionofair-conditioningsystemgenerallyincludethesections:

（1）PartofthenewwindAir-conditioningsystemduringoperationtocapturepartoftheoutdoorfreshair（iefreshair）,thispartofthefreshairtomeetindoorstaffrequiredminimumfreshairvolume,soairconditioningsystemoffreshairtakenintotheamountdeterminedbyair-conditioningsystemserviceusesandhygienerequirements.Thenewwindintothegeneralpopulationinthesurroundingareasfrompollution.ThesenewwindintoportandairconditioningsystemsandnewairductsinstallationofnewwindDust（newstyleairfilter）,newairheaters（alsoknownasair-conditioningsysteminaheater）cametogethertoformanewairsystemairconditioningsystem.

（2）PartofairpurificationAir-conditioningsystemaccordingtotheirdifferentuses,purificationofairindifferentways.Therefore,intheairpurificationsystemhassetaninitialeffectofasimpleairfiltercleaningsystem,butalsosetaninitialeffectiveairfilterandairfilterefficiencylevelofthegeneralpurificationsystem,inadditiontosettinganinitialefficiencyairfilters,oneintheefficiencyofairfiltersandaHEPAfilterforthreehigh-purificationsystemfilter.

（3）Partoftheairheat,wetAirheating,humidificationandcooling,dehumidification,willcombinetheprocess,knownastheairconditioningsystem,heat,wetpart.Intheairtoheat,wetprocessing,surface-airheatexchanger.Settinganewairintakesinthesystem,areturnairastheairbeforetheairheaterinaheater;setbeforecoolingdehumidificationairheater,knownasthesecondaryairheater;setinair-conditionedroombeforesendingoutletairheater,knownasthethreeairheaters.Threeair-conditionedroomheatertoregulatethemainroleofthetemperature,thethermalcoalusedforthehotwaterorelectricheating.Thesurfaceheatexchangerincoldwaterorarefrigerantthroughthelow-temperaturewater-cooledsurface,calledthedirectevaporativecoolerorcoolersurface,butalsobysprayingcoldwaterorhotwaterwasher,Therearealsodirectwatersprayofsteamapproachtoachievetheairhotandwetprocessing.

（4）ThesectionofairtransportationanddistributionandcontrolFansandairconditioningsystemstosend,returnairpipeaspartofairtransport.Ductintheregulationofairvalve,butterflyvalve,damper,bootvalveandairoutletsuchaspoints,controlsection.Air-conditioningsystemaccordingtothedifferentairresistance,setthenumberoffansaredifferent,iftheairconditioningsystemforawindturbineset,thefansnotonlyfromtheairrole,therolewasunderwayasasinglereturnairfansystem;iftheairconditioningsystemsettwofans,onefortheblower,anotherfanfortheback,thencalledthetwo-fansystem.

（5）.coldandheatsourceofairconditioningsystem,Airconditioningsystemsusedinthecoldcoldsourceisgenerallydividedintonaturalandartificialsourcesofcoldsource.Naturalcoolingsourcegenerallyreferstogroundwaterfromdeepwells,artificialcoldsourcegenerallyreferstotheuseofartificialrefrigerationmeansavailable,whichincludesthevaporcompressionrefrigeration,absorptionrefrigeration,andsteamjetrefrigeration,andothermeans.Modernlarge-scalebuildingsareoftenusedforcentralairconditioningsystem

Itsworkingprincipleiswhentheambienttemperatureistoohigh,theairconditioningsystem,throughre-circulatedtotheindoorheatawaysothattheindoortemperatureismaintainedatacertainvalue.Whenthecirculationofairthroughthefancoil,thehigh-temperatureairthroughthecoolingcoilofaluminummetalpriortoheatexchangecoilofaluminumabsorbsheatfromtheair,theairtemperaturedecreases,andthenthecycleoffreezingairgivenawayafterIndoor.Chilledwatercoolingcoilprovidedbythecoolingmachine,coolerbythecompressor,condenserandevaporatorcomponent.Compressortocompressrefrigerant,refrigerantcompressedintothecondenser,cooledbycoolingwaterintotheliquid,precipitationheatfromthecoolingwater,anddrainedthecoolingtowerair.Liquidrefrigerantfromthecondenserintotheevaporator,evaporation,sothatchilledwatercooling,andthenintothewater-cooledchilledwaterfancoilheatabsorptionintheair,againandagain,cyclecontinuously,theindoorheataway.Whentheambienttemperatureistoolow,theneedforhotwaterintothefancoil,andtheabove-mentionedprinciples,asgivenawayheatedindoorair.Afteraircooling,wateranalysisoftheairrelativehumiditydecreased,becomedry,soneedtoincreasehumidity,itisnecessarytoinstallhumidifiers,watersprayorspraytosteamairhumidificationtreatment,theuseofsuchwetairtosupplementinadequateamountofindoorwatervapor.

3.centralairconditioningsystemcontrolproblems

3.1Thecharacteristicsofthecontrolledobject

Air-conditioningsystemcontrolobjectsaremostlythermalobjects,fromtheperspectiveofcontrol,hasthefollowingcharacteristics:

（1）moredisruptiveForexample,incomingsolarradiationthroughwindows,heatisafunctionoftime,subjecttoweatherconditions;outdoorairtemperature,roomtemperaturethroughtheenvelopeonimpact;throughdoors,windows,buildingcrackspenetratedtheoutdoorairtemperatureimpact;tochangegas（ormaintainacertainpositivepressureroom）adoptedanewstyle,itstemperaturechangeshaveadirectimpactontheroomtemperature.Inaddition,theelectricheater（airheater）powersupplyvoltagefluctuationsandhotwaterheaterhotwaterpressure,temperature,steampressurefluctuations,willaffecttheroomtemperature.

Somuchinterference,sothatairconditioningloadinthelargercontextofchange,andtheirlocationintothesystem,form,sizeandfrequencyofsuchmagnitude,bothwiththeconstructionofthestructure（buildingthermalperformance）,useofdifferentanddifferent,evenwithairconditioningtechnologyitself.Shouldbeconsideredinthedesignofairconditioningsystemstominimizeinterferencewithortakinganti-jammingmeasures.Therefore,wecansaythatairconditioningprojectisbasedonbuildingthermal,air-conditioningtechnologyandautomationtechnologybasedonacomprehensiveengineering.

（2）Multi-conditionAirconditioningtechnologyinthetreatmentprocessishighlyseasonal.Year,atleastintothewinterseasonandsummertransition.Inrecentyears,distributedsystemsintheairconditioningsystem,airconditioningformultipleapplicationstocreateconditionsfavorableconditions.Astheairconditioningsystem,diversification,operationalmanagementandcontroldevicestobecomecomplicated.Thereforerequireoperatorstobeinstrictaccordancewiththeenergy-efficientdesignrequirements,includingtechnicalmeasurestooperate,andmaintain,notfreetochangerunChengXu,andZhong'sShebeiChaigaisystem.

（3）temperature,humiditycorrelationDescribethestateofthetwomainparametersofairtemperatureandhumidityastheyarenotcompletelyindependentofthetwovariables.Whentherelativehumiditychangeswillcausehumidification（ordehumidification）action,theresultswillleadtotemperaturefluctuations;andtemperaturechanges,soindoorairvaporsaturationpressure,theabsolutemoisturecontentinthesamesituation,directlychangetherelativehumidity（relativehumiditytoreducethetemperatureincreased,thetemperatureincreasereducesrelativehumidity）.Associatedwiththeparameterssuchasrelativeparameters.Clearly,inthetemperatureandhumidityoftheair-conditioningsystemsrequiredtoformtheautomaticcontrolsystemshouldpayattentiontothisfeature.

3.2ControlProblems

Suchascentralairconditioningsystemforlarge,complexprocess（orobject）ofthecontrolimplementation,usuallybysomekindofguidelines,theloweritsdecompositionintoanumberofsubsystemstoexercisecontrol,co-ordinationinthetopperformanceamongthevarioussubsystems,makingintegrationAfterthesystemisinsomesensetheoptimalstate.Problemsincontrolmainlyin:

（1）uncertaintyTraditional

（2）highlynonlinear

（3）semi-structuredandunstructured

（4）systemcomplexity

（5）Reliability

4.theselectionofcontrolstrategy

Theuncertaintyofcomplexsystems,sincethecontrolledobject（process）isdifficulttousethecharacteristicsofthemathematicalmodelaccuratelydescribed.ThetraditionalPIDcontroltheorybasedonclassicalcontrolandstatespacerepresentationbasedonmoderncontroltheorymethodstoachievehighdynamicandstaticchargedobjectqualitycontrolisverydifficult,usuallywithblack-boxmethod,thatmethodofinputandoutputdescriptioncontrolsy