1 |EnergyEfficiencyandRenewableEnergyeere.energy.govDetailsofExecutingtheTestProceduresforRefrigerationSystemsusedinWalk‐inCoolersandFreezersOctober22,2014DepartmentofEnergyBuildingTechnologiesProgramEERE‐2011‐BT‐TP‐00242Welcome•Introductions(aroundtheroom)•GroundRules–Speakoneatatime.–Sayyournamefortherecord– therewillbeacompletetranscriptofthismeeting.–Beconcise– sharethe‘air‐time’.–Keepthefocushere– cellphonesonsilent;limitsidebarconversations.–Webinarparticipantsturnphoneonmute;“raiseyourhand”toberecognizedtospeak.•OpeningRemarks3ListeningViatheWebcast•TheDepartmentisbroadcastingthismeetingliveovertheInternet.•DOEisprovidingthewebcasttoaccommodatestakeholdersthatareunabletoattendthepublicmeetinginperson.•Thewebbroadcastallowsstakeholderstolisteninandviewtheslides.4PurposeofthePublicMeeting•Describethescopeofcoverageinrelationtowalk‐incoolerandfreezer(WICF)refrigerationsystems.•DiscusshowthetestprocedurecanbeusedtotestWICFrefrigerationsystems.•DiscussthesamplingandAEDMrequirementsforWICFrefrigerationsystems.5PublicMeetingSlidesTopics1Overview of the Test Procedure2Scope of Test Procedure for Refrigeration3How the Test Procedure is Applied4Sampling and AEDM Requirements5Other FAQs6TestProcedureOverview•ThetestprocedureforWICFsisfoundat:10CFR431.304.•Generally,thereisaseparatemethodoftestfordifferentcomponentsofaWICF:(1)thepanels;(2)thedoors;and(3)therefrigerationsystem.•Today,wearediscussingvariousaspectsoftheWICFrefrigerationsystemtestprocedure.•InadditiontothetestprocedureforindividualunitsofaWICFrefrigerationsystem,DOEhasapplicablesamplingregulationsthatgovernhowmanufacturersdevelopratingsforeachbasicmodelofWICFrefrigerationsystem,alongwithregulationsthatallowtheuseofalternativemethodsforratingequipmentinsteadoftestingifcertaincriteriaaremet.Wewillalsodiscusstheseregulationstoday.7PublicMeetingSlidesTopics1Overview of the Test Procedure2Scope of Test Procedure for Refrigeration3How the Test Procedure is Applied4Sampling and AEDM Requirements5Other FAQs8ScopeoftheCoverageforWICFRefrigerationSystemsWhatrefrigerationsystemsarecovered?Generallyspeaking,refrigerationsystemscoveredbyWICFstandardsinclude:•Apackageddedicatedsystem(i.e.,amatchedunitcoolerandcondensingunitsoldasonepackage);•Asplit,matcheddedicatedsystem(i.e.,amatchedunitcoolerandcondensingunitsoldastwoparts);and•Asplitsystemthatisnotmatched,including:•Aunitcoolerthatissoldseparatelyforuseinconnectionwithamultiplexcondensingsystem;•Aunitcoolerthatissoldseparatelyforusewithoneormorededicatedcondensingunits;and•AdedicatedcondensingunitthatissoldseparatelyforusewithoneWICF(theWICFmaycontainoneormoreunitcoolers).9ScopeoftheTestProcedureforRefrigerationExamplesofpackagedrefrigerationsystems:Condensing sideor“Hot”sideWarmAirEvaporatingsideor“Cold”sideColdAirRefrigerationsystem installedonaWICF10ScopeoftheTestProcedureforRefrigerationExamplesofsplitrefrigerationsystemsandtheircomponents:Unitcooler(alsocalledanevaporator)Diagramofa“Split”or“Remote”SystemOutdoorcondensingunitIndoorcondensingunitCondensingsideor“Hot”sideEvaporatingsideor“Cold”sideColdAirWarmAirCompressorCondenserCoil&FanEvaporatorCoil&Fan11WICFRefrigerationSystemExceptionsAtthistime,thecurrentandthefutureWICFtestproceduresandstandardsdonotapplyto:•CondensingunitssolelydesignedandmarketedtoservemultipleWICFsorotherpiecesofrefrigerationequipment(Thesearecalled“multiplex”condensingunits.Thiscategoryincludesrefrigerationcompressorrackssometimesfoundinsupermarkets.)•Water‐cooledcondensingunitsorsystems•Equipmentintendedsolelyforscientific,medical,orresearchpurposes12PublicMeetingSlidesTopics1Test Procedure Background2Scope of Test Procedure for Refrigeration3How the Test Procedure is Applied4Sampling and AEDM Requirements5Other FAQs13HowtheTestProcedureisAppliedYoumayhavequestionsabouthowtoapplythetestprocedureincertainsituations...WhatifIonlymakecondensingunits?WhatifIonlymakecondensingunits?WhatifIonlymakeunitcoolers?WhatifIonlymakeunitcoolers?WhatoptionsdoIhaveifIwanttoratewalk‐inrefrigerationsystemsImanufacture?WhatoptionsdoIhaveifIwanttoratewalk‐inrefrigerationsystemsImanufacture?WhatifIdon’tmanufacturerefrigerationsystemsbutsellcomponentsmadebydifferentmanufacturers?WhatifIdon’tmanufacturerefrigerationsystemsbutsellcomponentsmadebydifferentmanufacturers?14HowtheTestProcedureisAppliedYoucanfindanswersintheCFR.Herearesomeimportantsections:•10CFR429,SubpartB—Certification•§429.11Generalsamplingrequirementsforselectingunitstobetested•§429.53Walk‐incoolersandwalk‐infreezers•§429.70Alternativemethodsfordeterminingenergyefficiencyandenergyuse•10CFR431,SubpartR—Walk‐inCoolersandWalk‐inFreezers•§431.302Definitions•§431.304TestProcedures15HowtheTestProcedureisAppliedNext,wewillwalkthroughsomeexamplesofhowtoapplythetestprocedureinseveralscenarios.1. WhataremyoptionsforderivingtheratingsofmybasicmodelsifImanufacturecondensingunits,unitcoolers,andcompletesystems?2. HowdoItestarefrigerationsystem?3. HowdoItestaunitcooler?4. HowdoItestacondensingunit?5. CanIsellrefrigerationsystemsthatIdidnotmanufactureasapackagewithotherWICFcomponents(e.g.,panels)?16HowtheTestProcedureisAppliedExample1:Imakematched,split‐systemwalk‐inrefrigerationsystems,individualunitcoolers,andindividualcondensingunits.Whataremyoptionsforratingmybasicmodels?Ingeneral,DOE’sregulationsarebasedonrefrigerationsystemefficiency(i.e.,AWEF).Inthiscase,amanufacturermaydevelopacertifiedratingforitsrefrigerationsystems,whichcanconsistofunitcoolersandcondensingunitstestedseparatelyorasmatchedsystems...withsomeimportantcaveats.Let’slookatanexample.17HowtheTestProcedureisAppliedExample1(continued):Let’ssayImake4basicmodelsofunitcoolersand3basicmodelsofcondensingunits.Icancombinetheseinto12basicmodelsofrefrigerationsystems.Isometimessellunitcoolersseparatelysotheycanbeusedinsupermarkets.UnitCoolersCondensingUnits18HowtheTestProcedureisAppliedExample1(continued):Whataremyoptionsforratingmyequipment?Oneoptionistorateall12possiblerefrigerationsystembasicmodels.Theywouldberatedandcertifiedasdedicatedcondensingsystems.19HowtheTestProcedureisAppliedExample1(continued):Ifyouwishtorepresenttheefficiencyoftherefrigerationsystembasicmodelsconsistingofunitcoolersusedwithamultiplexcondensingsystem,thesebasicmodelsmustalsobecertified.

Multiplex Condenser20HowtheTestProcedureisAppliedExample1(continued):Thatis16basicmodelsthathavetobeindividuallycertified!But thereisaneasierway...

Multiplex Condenser21HowtheTestProcedureisAppliedExample1(continued):Therecenttestprocedurefinalruleimplemented§429.53(a)(1)(iii),whichsaysthatiftherepresentedvalueofarefrigerationsystembasicmodelwasbasedonratingaunitcoolerformultiplexapplications,thatrepresentedvaluemaybeusedforallrefrigerationsystemscontainingthatunitcooler.

Multiplex Condenser22HowtheTestProcedureisAppliedExample1(continued):Inotherwords,youstillhavetocertifyall16ofthebasicmodelsthatyoumanufacture,butyoucanusethesamerepresentedvalueformultiplesystems.Butthereisaneveneasierway...

Multiplex Condenser23HowtheTestProcedureisAppliedExample1(continued):Therecenttestprocedurefinalrulealsoallowsyoutocertifybasicmodelsofrefrigerationsystemsbyratingdedicatedcondensingsystemsontheirown,usingnominalvaluesfora“dummy”unitcooler.(Thebasicmodelshavetocomplywiththededicatedsystemstandards.)

Multiplex Condenser 

# “Dummy” Unit Cooler24HowtheTestProcedureisAppliedExample1(continued):Nowthereareonly7basicmodelsthathavetobeindividuallycertified!

Multiplex Condenser 

# “Dummy” Unit Cooler25HowtheTestProcedureisAppliedExample1(continued):Ifyouhavealreadycertifiedtherefrigerationsystemsusingthenominalapproachofcertifyingtheunitcoolerandcondensingunitseparately,youdonotalsohavetocertifythebasicmodelofthematchedsystem...

Multiplex Condenser 

# “Dummy” Unit Cooler26HowtheTestProcedureisAppliedExample1(continued):Ifyouhavealreadycertifiedtheunitcoolerandcondensingunitbasicmodelsthatmakeupabasicmodelofmatchedsystem,youdonotalsohavetocertifythebasicmodelofthematchedsystem...

Multiplex Condenser 

# “Dummy” Unit Cooler...unlessyouwishtorepresenttheratingofthebasicmodel ofthematchedrefrigerationsystemasbeingmoreefficientthanthenominalapproach.Inthatcase,themoreefficientratingmustbebasedonmatchedtesting.27HowtheTestProcedureisAppliedExample1(continued):Condensingunitswithtwo‐capacity,multi‐capacity,orvariable‐capacitycompressorscannotberatedusingthenominalvalues.Theymustberatedaspartofamatchedrefrigerationsystem. 

# “Dummy” Unit CoolerCondensingunitwithatwo‐capacity,multi‐capacity,orvariablecapacitycompressor28HowtheTestProcedureisAppliedExample1(continued):Representationsoftheenergyefficiencyofabasicmodelmustbebasedonasample ofunitsofthatbasicmodel.Wewillcoverthistopicinmoredetaillater.29HowtheTestProcedureisAppliedExample2:Iamawalk‐inrefrigerationsystemmanufacturer.HowdoItestawalk‐inrefrigerationsystem?Lookin10CFR431.304forinstructions.•431.304(c)(10)says:DeterminetheAnnualWalk‐inEnergyFactorofwalk‐incoolerandwalk‐infreezerrefrigerationsystemsbyconductingthetestproceduresetforthinAHRI1250‐2009(incorporatedbyreference;see§431.303)...(withmodifications(i)‐(xv)).Remember,representationsoftheenergyefficiencyofabasicmodelmustbebasedonasample ofunitsofthatbasicmodel.30HowtheTestProcedureisAppliedExample3:Iamawalk‐inrefrigerationsystemmanufacturer.Isellunitcoolersseparately,butIdon’tknowwhereagivenunitcoolergoesafteritleavesmyfactory.HowshouldItestaunitcooler?10CFR431.304(c)(12)tellsyouhowtotestawalk‐incoolerandfreezerrefrigerationsystemcomponentdistributedindividually.•10CFR431.304(c)(12)(i)says:CalculatetheAWEFforarefrigerationsystemcontainingaunitcoolerthatisdistributedindividuallyusingthemethodfortestingaunitcoolerconnectedtoamultiplexcondensingsystem.•UsetheDOEtestprocedureasnotedin10CFR431.304(c)(10)•Theapplicablestandardsarethemultiplexsystemstandardsin§431.306(e).Remember,representationsoftheenergyefficiencyofabasicmodelmustbebasedonasample ofunitsofthatbasicmodel.31HowtheTestProcedureisAppliedExample4:Iamawalk‐inrefrigerationsystemmanufacturer.Isellcondensingunitsseparately,butIdon’twanttohavetocertifymycondensingunitswitheverypossibleunitcoolertheymightbeinstalledwith.HowshouldItestacondensingunit?10CFR431.304(c)(12)tellsyouhowtotestawalk‐incoolerandfreezerrefrigerationsystemcomponentdistributedindividually.•10CFR431.304(c)(12)(ii)says:CalculatetheAWEFforarefrigerationsystemcontainingacondensingunitthatisdistributedindividuallyusingthefollowingnominalvalues.•UsethenominalvalueswhenconductingtheDOEtestprocedureasnotedin10CFR431.304(c)(10).•Theapplicablestandardsarethededicatedsystemstandardsin§431.306(e).Remember,representationsoftheenergyefficiencyofabasicmodelmustbebasedonasample ofunitsofthatbasicmodel.32HowtheTestProcedureisAppliedExample4,continued:Whatarethesenominalvalues?HowexactlydoIusethem?•Thenominalvaluesareusedtocalculate“dummy”unitcoolercharacteristicssuchasfananddefrostwattagesoyoudon’thavetotestanactualunitcooler(oreverypossibleunitcooler)withyourcondensingunit.•Thenominalvaluesaredesignedsothattheunitcoolervaluesscalewiththesizeofthesystemyouaretryingtotest.Forexample,thebiggerthesystem,themorefanpowerisassumed.•Thenominalvaluesaredesignednottopenalizeyouforusingthem!Inotherwords,theyassumetheunitcoolerhascertaindesignoptionsthathelpthesystemmeetthededicatedsystemstandardsinDOE’sanalysis.33HowtheTestProcedureisAppliedExample4,continued:CanyougiveanexampleofhowtousethenominalvaluestofindtheAWEFforacondensingunit?Yes!Let’sconsideracondensingunitwiththefollowingcharacteristics:•Fixedcapacity•Designedforindooruse•Designedforawalk‐infreezer•Implementshotgas asadefrostmechanismanddoesnothaveanyinstructions fordefrostfrequency•HastwoECMcondenserfanswith1/15horsepowermotors34HowtheTestProcedureisAppliedExample4,continued:Follow3basicstepstodeterminetheAWEFforthisunit:1. Testthecondensingunit undertheratingconditionsusingtheDOEtestprocedure.2. Calculatethenominalvalues forthe“dummy”unitcooler.3. UsethetestvaluesandnominalvaluestocalculatetheAWEF.35HowtheTestProcedureisAppliedExample4,continued:Step1:TesttheCondensingUnit•From431.304(c)(10):DeterminetheAnnualWalk‐inEnergyFactorofwalk‐incoolerandwalk‐infreezerrefrigerationsystemsbyconductingthetestproceduresetforthinAHRI1250‐2009(incorporatedbyreference;see§431.303)•FindtheratingconditionsinAHRI1250‐2009thatcorrespondtothetypeofequipmentbeingtested.36HowtheTestProcedureisAppliedExample4,continued:Step1:TesttheCondensingUnit(continued)•NotethatyouonlyhavetoperformthesuctionAtest.(TheSuctionBtestisifyouaretestinganactual unitcoolerandcalculatingacombinedratingusingthemix‐matchmethodinSection7.8ofAHRI1250‐2009,butDOEdoesnotusethismethod.)37HowtheTestProcedureisAppliedExample4,continued:Step1:TesttheCondensingUnit(continued)•Let’ssayyouperformthetest.Yougetthefollowingresults:•Grossrefrigerationcapacity=5,500Btu/h•Inputpowerofcondensingunit=1,500Watts38HowtheTestProcedureisAppliedExample4,continued:Step2:Calculatethenominalvaluesfortheunitcooler10CFR431.304(c)(12)(ii)describeshowtocalculatethenominalvaluesbasedonthetypeofsystem.•Firstdeterminethenominalvaluesfortheevaporatorfans:•On‐cycleevaporatorfanpowerEFcomp,on=0.016× Grosscapacity=88W•Off‐cycleevaporatorfanpowerEFcomp,off=0.2× on‐cycleevaporatorfanpower=18W•Nextdeterminethenominalvaluesfordefrost:•Hotgasdefrostheatcontributionpercycle=0.18× Grosscapacity=990Btu/h•Hotgasdefrostenergyusepercycle=0.5× hotgasdefrostheatcontribution/3.412=145W•#ofdefrostcycles=2.5(becausetherearenomanufacturerinstructions)39HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEFUsethecalculationsinAHRI1250‐2009,Section7:Therearesomeintermediatevaluesyouneedtofind...40HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEF(continued)•Calculatethenetcapacity:•Netcapacityqss=Grosscapacity– EFcomp,on× 3.412=5,200Btu/h•Calculatethetotalon‐cycleenergyuse:•EnergyuseEss=Measuredcondensingunitenergyuse+on‐cycleevaporatorfanpower=1,588W41HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEF(continued)•Calculateaveragedailydefrostenergyandheatload:•DailydefrostenergyuseDF=Defrostenergyusepercycle× #ofcycles=363W•DailydefrostheatcontributionQDF=Heatcontributionpercycle×#ofcycles=2,475Btu/h•CalculatedefrostenergyandheatcontributionusingtheequationsinsectionC11.3ofAHRI1250‐2009:•Averagedefrostwattsࡲࡰሶൌ஽ிଶସൌ܅	૞૚•Averagedefrostheatcontributionࡽሶࡲࡰൌொವಷଶସൌܐ/ܝܜ۰	૜૙૚42HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEF(continued)•CalculatetheBoxLoadsusingtheequationsinsection6.3ofAHRI1250‐2009:•BLH=0.8× qss=4,160Btu/h•BLL=0.4× qss=2,080 Btu/h•CalculatetheLoadFactorsusingtheequationsinsection7ofAHRI1250‐2009:•ࡴࡲࡸൌ஻௅ுାଷ.ସଵଶൈாி೎೚೘೛,೚೑೑ା	ொሶವಷ௤ೞೞାଷ.ସଵଶൈாி೎೚೘೛,೚೑೑ൌ૙. ૡ૛•ࡸࡲࡸൌ஻௅௅ାଷ.ସଵଶൈாி೎೚೘೛,೚೑೑ା	ொሶವಷ௤ೞೞାଷ.ସଵଶൈாி೎೚೘೛,೚೑೑ൌ૙. ૝૜43HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEF(continued)•Recapvaluesthatwerejustcalculated:•qss=5,200Btu/h•Ess=1,588W•EFcomp,off=18W•ܳሶ஽ி=103Btu/h•ܨܦሶ=15W•n=8760h(sinceitisanindoorunit)•PlugthesevaluesintotheequationtocalculatetheAWEF.44HowtheTestProcedureisAppliedExample4,continued:Step3:CalculatetheAWEF(continued)•Calculatethetotalannualboxloadandenergyuse:•∑ࡸ࡮ൌ0.33 ൈ ܪܮܤ ൅ 0.67 ൈ ܮܮܤ ൈ ݊ ൌ૛. ૝ ൈ ૚૙ૠ۰ܝܜ•∑ࡱൌ0.33 ൈܧ௦௦ൈ ܪܨܮ ൅ ܨܧ௣௠௢௖, ௙௙௢ൈ1 െ ܪܨܮൈ 0.67൅ܧ௦௦ܨܧ ൅ ܮܨܮ ൈ௢௙௙ ,௖௢௠௣ൈܨܦ ൅ ܮܨܮ െ 1ሶൈ ݊ൌૠ. ૞ ൈ ૚૙૟ܐ܅•Finally,theAWEF:•۳۴܅ۯൌ∑஻௅∑ாൌܐ܅/ܝܜ۰	૛૛ .૜45HowtheTestProcedureisAppliedExample4,continued:I’vetestedmyunitandfounditsAWEF.HowcanIcompareittothenewenergyconservationstandardforthistypeofproduct?Determinewhatequipmentclasstheequipmentisin:•Itisacondensingunitsoitisdedicatedcondensing=DC•Itisforafreezersoitislowtemperature=L•Itisdesignedforuseinsidesoitisindoor=I•Itsgrosscapacityis5,500Btu/hwhichis<9,000TheclassisDC.L.I,<9,00046HowtheTestProcedureisAppliedExample4,continued•ThisequipmentclasshasanequationforminimumAWEF,asshownin10CFR431.306(e):47HowtheTestProcedureisAppliedExample4,continued•Pluggingthegrosscapacityintotheequation:•AWEF=5.93× 10‐5×Q*+2.33=2.62*Q=thegrosscapacity•ComparethistothetestedAWEFof3.22•CalculatedAWEF3.22>MinimumAWEF2.62•Thetestresultfromtheunitishigherthantheminimumstandard!•Don’tforgetthatyouneedtotestasample ofunitstocertifyanddemonstratecompliance!48HowtheTestProcedureisAppliedExample5:Iamawalk‐inpanelmanufacturer.Iwanttosellrefrigerationsystemswithmypanels.HowdoImakesureIamincompliancewiththerefrigerationstandards?Besureyouaresellingcertifiedrefrigerationsystems,whichcanconsistofunitcoolersandcondensingunitstestedseparatelyorasmatchedsystems.That’sit!Youdonothavetodoanytestingorcertificationoftherefrigerationsystemsyousell...unless youwishtorepresenttheefficiencyoftherefrigerationsystemasbeinghigherthanthecertifiedrating(s),orifyoumodifytherefrigerationsystemsuchthatitchangestheefficiency.49PublicMeetingSlidesTopics1Test Procedure Background2Scope of Test Procedure for Refrigeration3How the Test Procedure is Applied4Sampling and AEDM Requirements5Other FAQs50SamplingandAEDMRequirementsIamawalk‐inrefrigerationsystemmanufacturer.Iwantmakerepresentationsofthecertifiedratingsofmyequipment.WhatdoIdo?•Foreachbasicmodel,youhavetodetermineyourrepresentedvaluebasedonasample ofunitswithinabasicmodel.•In§429.53,Walk‐incoolersandwalk‐infreezers:(a) Determinationofrepresentedvalue—(1)Refrigerationequipment:Manufacturersmustdeterminetherepresentedvalue,whichincludesthecertifiedrating,foreachbasicmodelofwalk‐incoolerorfreezerrefrigerationequipment,eitherbytesting,inconjunctionwiththeapplicablesamplingprovisions,orbyapplyinganAEDMsatisfyingthecriteriaprovidedat§429.70(f)(1).(i)Unitstobetested.(A)Iftherepresentedvalueforagivenbasicmodelisdeterminedthroughtesting,thegeneralrequirementsof§429.11apply...51SamplingandAEDMRequirementsWhataretherequirementsin§429.11?•Herearethemainpoints:•Youhavetotestatleast twounitsofabasicmodeltodetermineitscertifiedrating.•Theunitsonwhichtheratingisbasedmustbeproductionunits(orunitsrepresentativeofproductionunits)– inotherwords,theyhavetobeunitsproducedforsale,notdemounits.•Thetestedunitsmustbeselectedatrandom.•Componentsofsimilardesignmaybesubstitutedwithoutadditionaltestingifthesubstitutiondoesnotaffectthecertifiedrating.•Anyrepresentedvaluesofmeasuresofenergyefficiency,waterefficiency,energyconsumption,orwaterconsumptionforallindividualmodelsrepresentedbyagivenbasicmodelmustbethesame.52SamplingandAEDMRequirementsHowdoIderivearatingformyequipmentfrommytestresults?§429.53(a)(1)(i)(B)(2)saysthattherepresentedvalueofenergyefficiencyofabasicmodelshallbelessthanorequaltothelowerof:(i)ThemeanofthetestsampleresultsOr(ii)Thelower95percentconfidencelimit(LCL)*ofthetruemeandividedby0.95.*TheLCLcanbefoundusingtheequation:ܮܥܮ ൌ ݔ̅െ ݐ଴.ଽହ௦௡Where:x̅isthesamplemean;sisthesamplestandarddeviation;nisthenumberofsamples;andt0.95isthetstatisticfora95%one‐tailedconfidenceintervalwithn−1degreesoffreedom(fromAppendixAtosubpartB).53SamplingandAEDMRequirementsIwanttominimizemytestburden.IsthereanotherwayIcandeterminetheefficiencyofabasicmodelofWICFrefrigerationequipment?Yes!See§429.53(a)(1)(ii):Alternativeefficiencydeterminationmethods.Inlieuoftesting,arepresentedvalueofefficiencyorconsumptionforabasicmodelofawalk‐incoolerorfreezerrefrigerationsystemmustbedeterminedthroughtheapplicationofanAEDMpursuanttotherequirementsof§429.70andtheprovisionsofthissection.AnAlternativeEfficiencyDeterminationMethod(AEDM)isjustwhatitsoundslike– analternativemethodfordeterminingtherepresentedvalueofabasicmodelofyourequipment,thatyoucanuseinlieuoftesting.54SamplingandAEDMRequirementsThatsoundseasy!...What’sthecatch?Youcan’tusejustany method.§429.70containscertainrequirementsforusinganAEDM.Forinstance,youcanonlyuseanAEDMif:•TheAEDMestimatesthemodel’senergyconsumptionasthoughtitwerebeingmeasuredbytheDOEtestprocedure;•TheAEDMisbasedonengineeringorstatisticalanalysis,computersimulationormodeling,orotheranalyticalevaluationofperformancedata;and•YouhavevalidatedtheAEDMwithtestingofproductionunits.55SamplingandAEDMRequirementsHowdoIvalidatemyAEDM?§429.70(c)(2)containsinstructionsforvalidatingAEDMs.Insummary,youmustvalidateanAEDMbybothtesting andmodeling oneunitfromeachofatleast2basicmodelsineachvalidationclassandcomparingtheresults.Foreachbasicmodel,theefficiencypredictedbytheAEDMmustnotbemorethan5percentgreaterthantheefficiencydeterminedthroughtesting,and theefficiencypredictedbytheAEDMmustmeetorexceedtheapplicablefederalenergyconservationstandard.56SamplingandAEDMRequirementsWhatisavalidationclass?Avalidationclassisacategoryofequipmentfromwhichyoumustselectproductstotest,ifyouwanttouseanAEDMforthatclass.Validationclassesforwalk‐incoolersandfreezerscanbefoundin10CFR429.70(f)(2)(iv).57SamplingandAEDMRequirementsCanIusetestresultsfromonevalidationclasstovalidateanotherclass?Generally,AEDMsvalidatedforoutdoorclassesmaybeusedforindoorclasses(ofthesametemperatureclassandcondensingtype).Theoppositeisnottrue– AEDMsvalidatedforindoorclassesmaynotbeusedforoutdoorclasses!58SamplingandAEDMRequirementsWhatothervalidationrequirementsarethere?ThereareafewadditionalrequirementsforthemodelsusedtovalidatetheAEDM:•Testdatamustbefromphysicaltestsofcurrentmodels.•TestresultsmustmeetorexceedcurrentFederalstandards.•TestsmustbeperformedinaccordancewiththeapplicableDOEtestprocedure.•Forratingarefrigerationsystemconsistingofanindividualcomponent(unitcoolerorcondensingunit),theAEDMmustestimatethesystemratingusingthenominalvaluesintheDOEtestprocedurefortheothercomponent.59SamplingandAEDMRequirementsI’vevalidatedmyAEDM!HowcanIapplyittountestedbasicmodelstogeneratemyratingsandreducemytestingburden?OnceyourAEDMhasmetthevalidationcriteria,youmayuseittogenerateratingsforallofyouruntestedbasicmodelsforwhichtheAEDMhasbeenvalidated.WhileDOEdoesnotrequireperiodictestingtocheckontheAEDM’saccuracyovertime,manufacturersareencouragedtoensuretheresultsoftheirAEDMremainaccurateandtheirrepresentedratingsarevalid.60SamplingandAEDMRequirementsI’vevalidatedandcanbeginusingmyAEDM!WhatrecordsdoIneedtokeep?YouneedtohaveavailableonrequestforinspectionbyDOE:•TheAEDMitself(includingthemathematicalmodel,engineeringorstatisticalanalysis,and/orcomputersimulationthatisthebasisoftheAEDM)•Equipmentinformation,completetestdata,AEDMcalculations,andstatisticalcomparisonsfromtheunitsthatweretestedtovalidatetheAEDM•EquipmentinformationandAEDMcalculationsforeachbasicmodeltowhichtheAEDMhasbeenapplied61PublicMeetingSlidesTopics1Test Procedure Background2Scope of Test Procedure for Refrigeration3How the Test Procedure is Applied4Sampling and AEDM Requirements5Other FAQs62FAQ1Q:TherearerefrigerationunitscurrentlyinproductionfortheWICFmarketthatcontainmultiplecondensingunitsfordedicatedrefrigerationsystems.Thesecondensingunitsareindependentfromeachotherexceptthattheyhaveacommonenclosureandshareacommoncondenserfanandfanmotor.Aretheseunitscoveredbytheregulation?A:BasedonthecharacteristicsoftheWICFrefrigerationsystemasdescribedabove,thisassemblyseemstobeamultiplexcondensingunitsinceitisdesignedtoservemultipleWICFs.Inparticular,thesecondensingunitsshareacommoncondenserfanandfanmotor,andthereisnomethodwithinthetestproceduretoseparateoutthefanpowerforeachindependentcondensingunit.Remember,itisultimatelythemanufacturer’sresponsibilitytocompareitsproductcharacteristicstoDOE’sregulationstodetermineapplicabilityofthetestproceduresandstandards.63FAQ2Q:Therearerefrigerationunits,specificallyCondensingUnits,onthemarkettodayfortheWICFmarketthatoperatefrom+40°Fto‐30°F.Theseunitscanbecategorizedas"Coolers"or"Freezers."Mostofthetime,themanufacturerdoesnotknowhowtheunitwillbeappliedinthefield.Underwhatcategoryshouldtheseunitsbetested?A:Such“convertible”productswouldneedtobetestedasbothmediumtemperatureandlowtemperaturesystemsandwouldneedtomeettheapplicablestandards.64FAQ3Q:TherearerefrigerationunitscurrentlyinproductionfortheWICFmarketthatarecapableofbeingusedwithmultiplerefrigerantswithoutanychangestotheequipment.Theseunitsareoftensoldunderasinglemodelnumberandtheendcustomerappliesanyapprovedrefrigerant.CantheseunitsbelistedwiththeminimumAWEFforallcompatiblerefrigerantsorareseparatemodelnumbersandAWEFvaluesrequiredforALLcompatiblerefrigerants?A:Theseunitscanbelistedasasinglebasicmodelbasedontheresultsfromtestingwiththerefrigerantthatresultsinthelowestefficiency(assumingthemanufacturerdoesnotwanttoclaimthedifferencesinefficiencyresultingfromusingvariousrefrigerants).65FAQ4Q:WhencalculatingtheAWEFofamediumtemperaturededicatedcondensingunitwithelectricorhotgasdefrostwhicharesoldseparately,whatvalueshallbeassignedtothedefrostenergypercycleandheatcontributionpercycle?A:Thetestproceduredoesnothaveamethodfortestingelectricorhotgasdefrostonmediumtemperaturesystems.AHRI1250‐2009specifiesthatthedefrosttestmethodisforfreezersonly.Thebasicmodelmustmeetthestandardwhentestedwithoutdefrost.66FAQ5Q:Ifapieceofequipmentisnotcapableofoperatingatthespecifiedtestconditions,canthatpieceofequipmentbetestedattestconditionsthatareasclosetothespecifiedconditionsaspossible?Forexample,ifacondensingunithasaminimumcapableSSTof+40°Fandthetestprocedurerequiresrunningat+25°F,canthetestberunat+40°F(similartoCREtestprocedure)?A:Thetestproceduredoesnothaveratingconditionsforthisequipment.Themanufacturermustapplyforatestprocedurewaiver.67FAQ6Q:Ifamanufactureridentifiesalowvolumeenergysavingfeaturethatwillrequireextensivetesting,tolowerthetestingburden,cantheunitbetestedwiththefeaturedeactivatedandratetheunitattheleastefficientpoint?A:Yes!10CFR429.11allowsforcomponentsofsimilardesigntobesubstitutedwithoutadditionaltestingifthesubstitutiondoesnotaffectthecertifiedrating.68FAQ7Q:Whencalculatingtheheatloadfromhotgasdefrost,whatvalueisamanufacturerrequiredtouseforQDFonatwo‐capacityorvariable‐capacityrefrigerationsystem?A:Manufacturerswouldconductthehotgasdefrosttestbyusingthecalculationsin10CFR431.304(c)(10)(xii).Forthegrosscapacityterm,thecapacityasmeasuredatthehighambientconditionandathigh‐speedoperationshouldbeused.69FAQ8Q:Forhotgasunitcoolerssoldseparatelythemanufacturerdoesnotknowhowtheunitisgoingtobeapplied(withamultiplexcondenserordedicatedcondenser).Howshouldtheseberated?A:10CFR431.304(c)(12)(i)statesthatmanufacturersmustcalculatetheAWEFforarefrigerationsystemcontainingaunitcoolerthatisdistributedindividuallyusingthemethodfortestingaunitcoolerconnectedtoamultiplexcondensingsystem.