Experimental investigations of frosting and defrosting of evaporator coils at freezer temperatures

408 Pages·1997·4.6 MB·English

by  Al-Mutawa, Nawaf Khalid Mishari, 1961-

FROSTINEGXAPAENTRDIFDMREEEFNERTZOAESLRTITINENVMGEPOSEFTRIEAGVTAAUTPIROOENRSSATOOFRCOILS
NAWAFKHAUDMISHAR]AL-MUTAWA
OAFDTIHSESOEUFNRTITVAHETERIRSOEINDTQPOYURCIOETRFSOEEFRMNLETOONEFRTDIPSDTHAFIOOLITRNOHSPTEOAHPGREHTRDYIAEADLGURFAEUTELEFOSIFLCLHMOEONLT
UNIVERSITYOFFLORIDA
1»7
IdtheNuTnhceoBfeAslcloawhe,rTohfeMEevrtrc-yMsiciful,
MyFatherKThhailsiDdLMsissehnaariiiOaRndisMDyedMicoattheedrtUo,m-Marzouq
MyWifeUm-MiSiati
MySons:Mishari.AMullah,AhdultalunanandAbdelilab
MyBrothersAbu-FaisalandAbu-Khalid
MySisters:Kawakeb,Um-Nasser,Um-AheerandUm-Essa
MyNephews;Nasser.MohammedO..Faisal,Baiter,Khalid.
MyNEisescae.s;AbAdbuelearz,izS.amYaoru,seGfhaadnad.MDoalhaia.mDmienad.SA.rnal.
Basmah.MariamandDalia
ACKNOWLEDGMENTS
searchfor.whboeblteossAeldlamhe,btyheexLtoernddionfgtmhyeUlnifievetrosceo.mpHliestehetlhpis1dsieseskeratantdioHnisangduiedaranncmey1
degreeofDoctorofPhiiosog^yin(hefieldofmechanicaleogineetiog.
Iwouldliketoexpressmysincereappreciation,gratitudeandthankstotnyadvisor
Dr.S.A.Sberif,ch^xtrtanofthesupervisorycommittee,forhisinvaluableguidance,
atticism,andencouragementduringthecourseofmystudies.Ihavelearnedsomuch
fromthegraduatecoutaesthathetaughtinmfrigeradon.air-cooditioniogandihermal
systemsdesign.1havebeendelightedtobehisstudent,hisadviseeandmostofallhis
IalsowouldliketoextendmysirtceraappreciolionandthankstoDr.W.ELear,
Dr.H.A.IngleyUI,Dr.A.A.SeiregandDr.FT.Najafiforservingoomysuperviscey
committee.Theirsuggestionsandremaritshavehelpedinputtingthedissetintiontheway
itlooksrightnow.
Mysincerethanksgotoseveralotherindividualsforhelpingintheconsntiction
WanedsuopeJraastoinonTioefdetmheane,xpJeerfifmUcrrlnaaulbf.acJiulsitiiyneSmipelaodyheadm,inSttheivsepnroMjaeccFLatTitaneel,isRtoibnecrlutdHeastJkoehrn,
project.
IamgratefultoASHRAEforsupportiiigthisproject,andtothe'generousfinuicieJ
supportprovidedbydieDepartmentofMechanicalEngineeringwhichwascrucialin
beingablelosuccessfullycompletethischallengingproJccL!amalsogrelefultoKuwait
UnivetsilyforprovidingmeascholarshiptopursemyPhD.studiesatanAmerican
universiiy.
finally.1wishtoexpressmygratitudeandihanEstomypaienis.tomywifeand
foursons.Mtsbari,Abdullah,AbdulrahmanandAbdelilah.fortheprayers,padence.
devodon.andencouragementduringmystudies.
TABLEOFCONTENTS
ACKNOWLEDGMENTS....
LUISSTTOOFFnTOAUBRLEESS.....
2A.BSTRACT
LINTOODUCnON
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EXPERIMENTALFACIUTY
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IN33..S12..TRUIDn33333333333Ma.s..........E2u111111112i2..........TO13123456782iA...........TmccqATMFPRHBECSDnuerelreTeoauioiofeemcilftsmtIsrcsiipiitaintiusOirtewdpgiuWAoiirTaiNecurcnoecarhtraeqaniteiySalAPutguMncSiyoWMhNrtebyswiseieaisiDMreAatsteMaiMrsiuemsDncsoeurmsMgansarAeMessemBeTRuaumeoarsAroenaseeuntwrimmirAdsieesesCtrnnmueQiiiemUsscmeImsMSseIaTsuIrOeNme.nts 1U1i666778999l01Ol33857790929
TESTTNOPROCEDURBSANDDATAREDUCTION 120
44.J1..TDeasitainRgedPurcotcieodnures 112210
QUALIFICATIONTESTS 132
REFRIGERATION/DEFROSTCYCLEDYNAMICS _.... 151
AN66..A12.LYCCSaaIssSeeoOoffFEEnLnlOteeAirjiDnnSggA.AiirrTTeemtpiieptearlainuietoefo-f8-*1F3*.F.- j11j581g3
AA77CP.1iYA.LRIACCNMaaDEssReeToIoRffCIEAEnCniLteSeCtrTiOiUnnIggDLAAYiCirrOOTTFcOeiLmHdpEpOeeRTrra4att3uuArreSaooDffE--1F83*RF*OFSTINGOF 221254
RCMieon88osn.t.du2cr2el.lo12tldu..susDciaPMetonrevindeleos-ntlDMioienpslgtctnuSiestnnsagtigoSentage. ...222234671836
9.2.2.TnnsiiionfnnnSubsaiimued10SupersauiraiedCoadifions 28S
9.14.TnmsiiionfromSupcnaiunudloSubsaiuraiedCondidoiu 2%
ID.CONCLUSIONSANDRECOMMENDATIONS 305
105
APPENDICES
A.DESCRIPTIONOFTHECONDENSINGUNIT HO
B.
C.DESCRDTIONOFTHECOMPRESSORCAPACITYCONTROL
D-DESCRIPTIONOFTHEARTIFICIALLOADGENERATION
E.
F.CAEL.2C.ULCAalTcIulOaNtioPnRPOroCcEedDuUrReEforFtOhReRTeHfrEigLeIraQnUtIVDapRoErFMRasIsGEFlRoAwNRTare...,354
G-
G.2.SettingthePsychronretrieRoomloUieTestingConditions ”9
aCTAELMCPUELRAATTIUORNEPROCEDUREFORTHEAVERAGEFROST 373
REFERENCES 375
BIOGRAPHICALSKETCH 3S4
1
USTOFTABLES
Table Page
2.1.SummaryDescriptionofibePipiniSysiemComponenis 30
2.2.OverallCoefficientofHeatTransfer1/oftheFromWall 4S
2.3.OverallCoefficientofHeatTransfer1/oftheRearandSideWalls 50
2.4.OverallCoefficientofHeatTransferVofiheCeiling S
2.5.SnraraaryDescriptionoftheArdlicialLoadCcnecaiionSystemComponents61
3.1.ThermocoupleLocationsandtheFluidsTheyMeasure 73
3.2.LocaiionsofthctTessuteMeasureraenis.. 80
3.3.MethodsofPressureMeasurements S3
3.4.PowerTransducersandIheDevicesTheyMeaHite 98
3.5.SpecificaiionsofthePowerTransducers 99
3.6.SummaryDescriptionoftheElectricalWiringComponents 101
3.7.FuncnonsoftheToggleSwitches 107
3.8.SummaryDescriptionoftheDataAcquisitionBoards...._ 115
4.1.ComponentsComribulingtotheTotalSensibleInternalHeatGain 125
5.1.F(iEeAqTue=nc0y»Fa)ndDurationoftheDifferentModesfortheRunof
5.2.M(aEsAsTo=fM0«eFl)tCollectedFmraBoUiFanCoilUnitstortheRunof 135
6.1.F<iEeAqTue=nc.yg»aFn)dDurationofIheDifferentModesfortheRunof
6.2.M(aEsAsTo=fM-8eTl=L)CoUecieiJFromBothFan-CoUUniufortheRunof
6.3.F(rEeAqTue=nc-yI3a“nFd)DurailonoftheDifferentModesfor(heRunof
6.4.M(aEsAsTo=fM.e13l"tFC)ollectedFromBothFan^^oUUnitsfortheRunof
7.1.TLoouatd]SReenfsriigbelreaHtieoanlLRoaatidoRfaolretwheitRhuCnomofpo(nEeAnTts=a-n8'd’Ft)heAverage 223
7.2.DLeofardosRtatHeeaatndInDpeuftr.oHsetaEtffRiecqiueinrceydfotrotMheelRtuFnCoUf-(TEFArTos=u-DSefTr)ostHeal
7.3.CAovnetrraigbeutCioolnlfPoerrtfhoerRmaunnceofL(oEadATRa=te.8a“nFd)Fan-Defrost
7.4.TLootaadlSReenfsriibgleeraHtieoantLRoaaUdoRfaotretwhietRhuCnoomfpo(nEeAnTts=a-n1d3'tFh)eAverage 233
7.5.DLeofardosRtatHeeaatndInDpeuftr,oHsetaEtffRiecqiueinrceydfotrotMheelRtuFnCUof-(TEFAroTst=.-D1e3f*rFo)stHeat
7.6.CAovnetrraigbeotCioonUfPoerrtfhoerRmaunnceofL(oEadATRa=le-1a3n'dF)Pan-Defrost 236
A.I.SummaryDescriptionoftheCondensiogUnitAuniliarie
E.l.DataFromthePerformanceTests.,
E2.PolynomialCceffic
C.l.InitialPosiiiansoftheSolenoidValves....
C.2.InitialPotiiionsofUieCaieandBallVaives.