U S Department ofU.S.DepartmentofEnergyTest ProcedureChanges for CondensingChangesforCondensingClothes Dryers09/04/20071 of 22Hoffman - SJTCWhirlpool CorpBackground• Code of Federal Regulations Title 10–Energy,Part 430 “Energy Conservation Program forConsumer Products”•Subpart A section 430 2 states“Electric clothesSubpartAsection430.2statesElectricclothesDryer means a cabinet like appliance designedto dry fabrics in a tumble-type Drum with forcedair circulation The heat source is electricity andaircirculation.Theheatsourceiselectricityandthe Drum and Blower(s) are driven by an electricMotor(s)”A di D S b B f P 430U if•AppendixDtoSubpartBofPart430–normTest Method For Measuring The EnergyConsumption of Clothes Dryers09/04/20072 of 22Hoffman - SJTCWhirlpool Corpp yBackground–cont’d• Appendix Dprocedure steps which conflict for apcondensing Dryer:– Paragraph 2.1 of section 2, “Installation” states: Install theclothes Dryer in accordance with the manufacturer’instructionsclothesDryerinaccordancewiththemanufacturer sinstructions.The Dryer exhaust shall be restricted by adding the AHAMexhaust simulator described in 3.3.5 of HDL-1................– Paragraph 2.8 of section 2, “Clothes Dryer preconditioning”states: Before any test cycle, operate the Dryer without a testload in the non-heat mode for (15) minutes or until the dischargeair temperature is varying less than (1) degree F for (10)minutes whichever is longer in the test installation location withminutes,whicheverislonger,inthetestinstallationlocationwiththe ambient conditions within the specified test conditiontolerances of 2.209/04/20073 of 22Hoffman - SJTCWhirlpool CorpAssessment• The condensingDrer falls within the DOEydefinition for a clothes Dryer and therefore isrequired to meet this energy standard•Define non-exhausted and exhausted Dryers inDefinenonexhaustedandexhaustedDryersinthe DOE standard.• Paragraph 2.1 of section 2 should state nonh t dDt f th h texaustedDryers are exemptfromthe exhaustrequirement.• Paragraph 2.8ofsection 2,“ClothesDryerag ap 8 o sect o , C ot es yepreconditioning” needs to be revised to accountfor dryer preconditioning cycle differencesbetween exhausted and non-exhausted Dryers09/04/20074 of 22Hoffman - SJTCWhirlpool CorpbetweenexhaustedandnonexhaustedDryersCondensing Dryer EnergyR lesultsEurotech model EDC158 Whirlpool model AWZ9995• Class “C” European energyrating• (3.7) FT3• Class “B” European energyrating• (3.7) FT3• (240) VAC @ (60) Hz• Unit has NO Air Cycle• (1) unit tested• (230) VAC @ (50) Hz• Unit has an Air Cycle• (4) units tested• Average energy factor = (2.86)lbs/Kwh for (3)coldruns• Average energy factor =(3 16) lb /K h f (3)h t• Average energy factor = (3.04)lbs/Kwh for (4)coldruns• Average energy factor =(3 22) lb /K h f (8)h t(3.16)lbs/Kwhfor(3)hotruns• There is a (10.5) percentdifference between “coldrunsandhotruns(3.22)lbs/Kwhfor(8)hotruns• There is a (5.9) percentdifference between “coldrunsandhotruns09/04/20075 of 22Hoffman - SJTCWhirlpool CorpandhotrunsandhotrunsCondensing Dryer EnergyR l ( i d)Results(continued)Whirlpool model AWZ9995 with additional runs,see previous slide for model detailPrevious Data• (4) unit tested•Average energy factor=(3 04)New Data• (1) unit tested• Average energyfactor =(3.15)seepreviousslideformodeldetailAverageenergyfactor(3.04)lbs/Kwh for (4)coldruns• Average energy factor =(3.22) lbs/Kwh for (8)hotrunsA (5 9) t diffg gy ( )lbs/Kwh for (3)coldruns• Average energy factor = (3.32)lbs/Kwh for (3)hotruns•A (5 4) percent difference•A(5.9)percentdifferencebetweencold&hotruns•A(5.4)percentdifferencebetweencold&hotruns• Average energy factor = (3.24)lbs/Kwh for (3)prediti dith “Ai ”cononedruns with“Air”cycle• A (2.9) percent differencebetweencold&Pre09/04/20076 of 22Hoffman - SJTCWhirlpool CorpconditionedrunsTemperature ResultsTemperatureResults•The Eurotech Condensing Dryer, model #TheEurotechCondensingDryer,model#EDC158, was thermocoupled in (5) locations• TC#1 - Ambient air OUT of the Condenser system• TC#2 - Ambient air INTO the Condenser system• TC #3 - Drum inlet air after the Condenser but before theHeater Element• TC #4 - Drum inlet air coming from the Heater Element• TC #5 - Drum outlet air leaving the Drum•See next slide for graphical view of theSeenextslideforgraphicalviewoftheCondensing system09/04/20077 of 22Hoffman - SJTCWhirlpool CorpThermocouple LocationsThermocoupleLocationsCondenser(Heat Exchanger)Ambient Air In(cold)TC#2TC#3HeaterElementDrumTC#1TC#4Ambient Air Out(Hot)= ThermocouplelocationTC#509/04/20078 of 22Hoffman - SJTCWhirlpool Corp= Blower FanTemperature DataE hC D li C lurotech-CottonDelicateCycleEurotech EDC158 Condensing DryerC tt D li t C lCottonDelicateCycle130140150Condenser, OutletCondenser, InletDrum, Condenser to ElementDrum, InletDrum, Outlet8090100110120

( Degrees F304050607080

Temperature (01020300 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 8509/04/20079 of 22Hoffman - SJTCWhirlpool CorpTime (minutes)Temperature DataWhi l lAi C lWhirlpool-rCycleWhirlpool ADZ9995 Condensing DryerAir Cycle after EnergyTestg120140Condensing Air OutletCondensing Air InletOutlet - InletEnd of Energy Test80100

(degrees F)(80) degrees F4060

Temperature(15) minutes(11) D diff ti l ft (15) i t0200 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90(11)Degreedifferentialafter(15)minutes09/04/200710 of 22Hoffman - SJTCWhirlpool CorpTime (minutes)Preliminary SummaryPreliminarySummary• CondensingDryer models are sold both withyand without “Air” Cycles• For a condensing Dryer model with an “Air”cycle the current procedure is potentially valid ifcycle,thecurrentprocedureispotentiallyvalidifthe condensing air system is considered theexhaustWh t h ld b d ith d i D•Whatshouldbedone withcondensingDryerswith NO “Air” cycle?• European EnergyStandardsmayaddressthisopea e gy Sta da ds ay add ess t scondensing Dryer pre-conditioning issue andaddress other condensing Dryer test proceduredifferences between exhausted Dryers09/04/200711 of 22Hoffman - SJTCWhirlpool CorpdifferencesbetweenexhaustedDryersOther Potential Resources toC id ?onsider?•European Energy Standards may addressEuropeanEnergyStandardsmayaddressthe condensing Dryer pre-conditioningissue and other condensing Dryer testissueandothercondensingDryertestprocedure differences between exhaustedDryers• EN 61121:2005 is the latest standard forDryer Energy in EuropeDryerEnergyinEurope09/04/200712 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toCd i DondensingDryers•Section 6.1“General”states:Section6.1Generalstates:– “ The measurements shall be carried out on a tumbleDryer installed and used in accordance with themanufacturer’s instructions, except as required by thisstandard”– “ Where the tumble Dryer is intended for use withouta duct (i.e. the tumble Dryer is intended to be ventedinto the room) the tumble Dryer shall be tested assupplied without a duct”09/04/200713 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toC d i D ( i d)CondensingDryers(continued)•Section 6 2 3“Resources and AmbientSection6.2.3ResourcesandAmbientConditions - Ambient Temperature” states:“The ambient temperature of the room in the–Theambienttemperatureoftheroominthevicinity of the Dryer shall be maintained t (23 ±2)°C throughout the test. The measuredambient temperature shall be recorded. Note:this can be done by leaving the machine atambient conditions for at least (12) hours”– (23) °C = (73.4) °F ± (3.6) °F09/04/200714 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toC d i D ( i d)CondensingDryers(continued)•Section 9 1“Performance Tests-General”Section9.1PerformanceTestsGeneralstates:“Tumble Dryers shall be configured with or–TumbleDryersshallbeconfiguredwithorwithout a duct as specified in section 6.1.”–“All tests shall be started with the tumbleAlltestsshallbestartedwiththetumbleDryer at ambient temperature according to6.2.3.”09/04/200715 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toC d i D ( i d)CondensingDryers(continued)• Section 9.2.1 “Procedure for drying performance –D i T t G l” t tDryingTestsGeneral”states:– “For automatic tumble Dryers, those programmes are selectedwhich aim to achieve the final moisture values given in table 3.”“Table 3: Dry cotton has a nominal final moisture content (0)–Table3:Drycottonhasanominalfinalmoisturecontent(0)percent with an allowable range forfinal moisture content of (-3)to (+3) percent.”– “The minimum number of valid cycles shall be five. The reportedlt f th lid l d f f th l tiresults ofthe validcycles are usedforfurther evaluationaccording to clause 10. If the Dryer is automatically stoppedduring a cycle and the reason is that the condensation box is fullof water, the fact is reported and the test is stopped.”–“Note: If the manufacturer gives the option to use a condensingtumble Dryer both with or without condensation box, the Dryershould be tested with the condensation box.”09/04/200716 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toC d i D ( i d)CondensingDryers(continued)• Section 9.2.2 “Procedure for dryingperformance–gpCondensation Efficiency” states:– “The condensation efficiency for a condenser tumble Dryer, shallbe measured using the Dry Cotton programme and settingselected to achieve the “dry cotton” result (this means theequivalent timer setting for a timer Dryer) in the drying test.”– “The mass of the test load is measured immediately before andafter the cycle The mass of the moisture condensed during theafterthecycle.Themassofthemoisturecondensedduringthecycle and collected in the container is determined. The firstcycle after a period of non-operation longer than (36) hours shallnot be used for evaluation.”– “During the time between two cycles, the door of the tumbleDryer shall be closed except for loading”09/04/200717 of 22Hoffman - SJTCWhirlpool CorpEN 61121:2005 Related toC d i D ( i d)CondensingDryers(continued)• Section 10.5 “Evaluation and Calculation–Condensation Efficiency” states:– “Efficiency of condensation, C, is determinedaccording to 9 2 2 as the ratio between the wateraccordingto9.2.2astheratiobetweenthewaterproduced during the cycle Ww, relative to the totalmass of water evaporated from the load”“ C /(f)f–= Ww/(Wi–Wis calculatedor each cycle andexpressed as percentage”–“Efficiencyof condensation is the mean value of aminimum of four valid cycles. Note: Due to thisrequirement the first run ofa condensation efficiencytest has normallyto be discarded ”09/04/200718 of 22Hoffman - SJTCWhirlpool CorpyWhirlpool’CondensingWhirlpool sCondensingDryer Test ProcedureProposal to DOECh tangestoAppendix D to Subpart B of Part430,Title 10Clothes Dryer Energy Standard09/04/200719 of 22Hoffman - SJTCWhirlpool CorpWhirlpool’s Condensing DryerP l DOEProposaltoDOE• Section 1 must incorporate definitions of an exhausted Dryer, nonexhausted Dryer and a condensing DryerexhaustedDryer,andacondensingDryer– An exhausted Dryer has a blower system which is intended to deliver the heated,moist air from the Drum cavity into aduct system external to the Dryer and thisduct system is exhausted into the outdoors.–Anon-exhausted Dryer is intended to be used without an external duct systemyand has no provision to connect to such a duct system.– A condensing Dryer is a non-exhausted tumble Dryer in which the air used forthe drying process is dehumidified by using room ambient air for cooling. Theblower system used for circulating roomambient air is independent of the heatedmoist air from the Drum cavitymoistairfromtheDrumcavity.• Paragraph 2.1 of Section 2 must be updated to include non-exhaustedDryers– Where the tumble Dryer is defined asa non-exhausted Dryer and is intended foruse without a duct. The tumble Dryer shall be tested as supplied without a duct.p– Where the tumble Dryer is defined asan exhausted Dryer and is intended for usewith a duct The Dryer exhaust shall berestricted by adding the AHAM exhaustsimulator described in 3.3.5 of HDL-1................09/04/200720 of 22Hoffman - SJTCWhirlpool CorpWhirlpool’s Condensing DryerProposal for DOE (continued)•To align with the European energy procedure,ToalignwiththeEuropeanenergyprocedure,Paragraph 2.8 of section 2 should incorporatethe following condensing Dryer pre-conditioningcycle– For condensing Dryers, the Dryer steady statet t t b l t bi ttemperature mustbe equalto ambientroomtemperature according to 2.2 before the start of alltest runs. Note: this can be done by leaving themachine at ambient room conditions for at least (12)hours between tests but not more than (36) hoursbetween tests09/04/200721 of 22Hoffman - SJTCWhirlpool CorpbetweentestsWhirlpool’s Condensing DryerP l DOE ( i d)ProposaltoDOE(continued)• To align with the European energy procedure and for consistency inresults (per Luise Christmann of Whirlpool Schorndorf) the U Sresults(perLuiseChristmannofWhirlpoolSchorndorf),theU.S.energy procedure should incorporate the following condensing Dryertest procedure steps– If the manufacturer gives the option to use a condensing tumble Dryerb th ith ith t d ti b th D h ll b t t d ith thbothwithor withoutcondensationbox,theDryer shallbetestedwiththecondensation box– If the Dryer is automatically stopped during a cycle and the reason isthat the condensation box is full ofwater, the test is stopped, and therun is invalidrunisinvalid– During the time between two cycles, the door of the tumble Dryer shallbe closed except for loading– The first cycle after a period of non-operation longer than (36) hoursshall not be used for evaluationshallnotbeusedforevaluation– Results from the first test run on an unused (dry) condensing Dryer areinvalid and cannot be used for the energy efficiency calculations– The Condenser unit of the Dryer must remain in place and not be takenout of the Dryer for any reason between tests09/04/200722 of 22Hoffman - SJTCWhirlpool CorpoutoftheDryerforanyreasonbetweentests.