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VRFESEL001US014B07

TRACE700BuildingEnergyModelingGuideforLGMultiV

VRFESEL001US014B07 Page2of24

TableofContentsThisGuide............................................................................................................................................3

1. Disclaimer....................................................................................................................................3ImportLibrary......................................................................................................................................4

2. TestingtheLibraryFile.................................................................................................................83. ImporttheMultiVLibraryFile.....................................................................................................9

MultiVIII(AirSource)System...........................................................................................................114. CreateSystems...........................................................................................................................115. Fanselection..............................................................................................................................126. CreatePlants..............................................................................................................................13

MultiVWaterII(WaterSource)System.............................................................................................167. CreateSystems...........................................................................................................................168. Fanselection..............................................................................................................................179. CreatePlants..............................................................................................................................17

EnergyRecoveryVentilator/DedicatedOutdoorAirSystem..............................................................2010. Applicationconsiderations........................................................................................................2011. Samplescenario.........................................................................................................................21

Appendix:MultiVperformanceDataLibrary.....................................................................................23References.........................................................................................................................................24


ThisGuideTheTraneTrace700BuildingEnergyModelingGuideforLGMultiVcontainsstepbystepinstructionstohelpusersmodelLGMultiVsystemoptions.ThedefinitionsofthecodewordsarecitedfromModelingGuideTRACE700BuildingEnergyandEconomicAnalysisversion6.2.DisclaimerTheBuildingEnergyModelingGuideandTraneTrace700libraryfilesareforcomparisonsandshouldbeusedasaguidelineonly.Buildingload/energyhasbeenapproximatedformodelingpurposesorinputvalueofequipment(capacity,powerinput,etc.),andactualresultsmayvarydependingonthesituation.TheconclusionsofthisModelingGuideandTraneTrace700libraryfiledonotguaranteeactualenergycostsorsavings.ThisModelingGuideandTraneTrace700libraryfileareintendedasadesignandanalysisguidetohelpdesignersoptimizethedesignoftheLGMultiVVRFsystembasedonenergyutilization.Modelingaccuracyishighlydependentonusersupplieddata.Itistheusersresponsibilitytounderstandhowthedataenteredaffectsprogramoutput,andtounderstandthatanypredefinedlibrariesaretobeusedonlyasguidelinesandTraneTrace700libraryfileforenteringthatdata.ThecalculationresultsandreportsbythisguideandTraneTrace700libraryfilearemeanttoaidthesystemdesignerandarenotasubstitutefordesignservices,judgment,orexperience.


USINGTraneTrace700TODESIGNVRFSYSTEMSThissectionbrieflydescribeshowtouseTRANETRACE700todesignVRFsystems.AllVRFdesignworkrequiresthesamegeneralfivestepprocedure:1. DefinetheProblem.

Firstdefinethescopeandobjectivesofthedesignanalysis.2. GatherData.

Beforedesigncalculationscanbeperformed,informationaboutthebuilding,itsenvironmentanditsHVACequipmentmustbegathered.Thisstepinvolvesextractingdatafrombuildingplans,evaluatingbuildingusageandstudyingHVACsystemneeds.Specifictypesofinformationneededinclude: Weatherdataforthebuildingsite. Constructionmaterialdataforenvelopesofexteriorandinterior

includingwalls,roofs,windows,doors,andfloors. Buildingsizeandlayoutdataincludingwall,roof,window,doorand

floorareas,exposureorientationsandexternalshadingfeatures. Internalloadcharacteristicsdeterminedbylevelsandschedulesfor

occupancy,lightingsystems,equipment,andventilationwithinthebuilding.

DataconcerningHVACequipment,controlsandcomponentstobeused.

Definetheutilityratesfortheproject3. EnterDataIntoTRANETRACE700.

Next,useTRANETRACE700toenterbuildingandequipmentdata.WhenusingTRANETRACE700,yourbaseofoperationisthemainprogramwindow.Thendefinethefollowingtypesofdatawhichareneededforsystemdesignwork:a. SelectWeatherData. OpentheWeatherdialogboxusingeitherofthesemethods:

IntheProjectNavigatorview,clickWeathericoninthetoolbarorclicktheSelectweatherinformationbuttoninthefloatingProjectNavigatortoolbar.

Inanyview,usethemenubartoselectActions>SelectWeatherInfo.

Clickontheregionofthemapwherethebuildingislocatedtodisplayalistofavailableweatherlocationsforthatregion.


Scrollthroughthelisttofindthedesiredlocationandselectit.ThelocationyoupickedappearsinthelowerleftcorneroftheWeatherdialogbox.

ClickOKtoreturntothemainscreen.

b. CreateSpaces/Rooms.TRACEperformscoolingandheatingloadcalculationsforeachindividualroom,soa"room"isthesmallestspaceforwhichyoucancalculateloads.Aroomcanbeasingleofficesurroundedbywallsorcanbetheperimeterportionofalargeopenplanofficearea.Inotherareasoftheprogram,youhavetheoptionofgroupingroomsintozonesand/orsystemsforhigherleveldesigncalculations(i.e.designairflows,coilcapacities,designtemperatures,etc.).Whencreatingrooms,youessentially"assign"toitallofthecomponentsthatcontributetooraffectitscoolingandheatingloads.Theseloadcomponentsinclude,butarenotlimitedto: Sizeandmassofroom Roomdesignthermostatsettings Size,construction,anddirectionofexternalwallsandroofs Size,properties,anddirectionofexternalwindowsandskylights Internalloads,suchaspeople,lights,andmiscellaneous

equipment Infiltration Ventilationrequirements Partitionwallsandexposedorslabongradefloors

c. EnterSystemData.Alongwithenteringroominformation,youalsoneedtodefinetheHVACairdistribution,or"airside,"systemsservingthebuildingsothattheprogramknowshowtosizethefansandcoils.ThisisdonebyselectingaSystemTypeandenteringanyappropriatesysteminformation.Aftertheprogramperformscoolingandheatingloadcalculationsforindividualrooms,itcalculatesroomairflows,coilloads,fansizes,andothersystemdesigninformation.DefiningtheSystemTypetellstheprogramhowtocalculatethisdesigninformation("block"vs."sumofpeaks")andwhatcomponents(coils,fans,etc.)makeupthesystem.

4. UseTRANETRACE700toGenerateDesignReports.


When you have finished all the steps in creating a project file, you are ready for the program to do its job and perform the Design, System, Energy, and Economics simulation phases. To start the calculation process: a. In the Project Navigator view, click the Calculate Output icon on Project

Navigator or the toolbar or select Calculate from the TRACE Actions menu.

b. Click the Calc Now button. This generates the reports and provides you with the View Results dialog box from which you can select reports to print.

5. SelectEquipment.Finally, use data from the reports you generated to select the appropriate cooling and heating equipment from LG VRF product catalogs. System and plant design reports provide information necessary to select all the components of your VRF system including outdoor units, indoor units, and control equipments. LG can provide a wide variety of electronic catalogs to make selecting equipment quick and easy. Please contact your local LG sales office or LG distributor for details.


ImportLibraryTheTRACE700programincludesaseparateLibrary/TemplateEditorapplicationthatletsusersviewthedetailedinformationfoundinthestandardtemplatesandlibraries.UsetheTRACE700LibraryTemplateEditortoimportthelibraryfileaccompanyingthisdocument.

ToImportthelibrary:

1. ClickEquipmentontheLibrariesmenu.2. SelectExportCustomLibraryfromtheFileMenu.3. Renamethelibrary.expfiletooriginal_libray.exp.Thisallowsusers

theabilitytoreturntothedefaultfileifneeded.


4. Closethedialogbox.

TestingtheLibraryFileTotestthelibraryfile:

1. ClickEquipmentontheLibrariesmenu.2. ClickCoolingontheEquipmentmenu.TheLibrary/TemplateEditors

programwilldisplaytheCoolingEquipmentwindow.3. ViewcurrentEquipmentlistsintheTRACE700DataDirectory.

4. Closethedialogbox.5. ClosetheLibrary/TemplateEditors.


ImporttheMultiVLibraryFileToimporttheMultiVlibraryfileintoTRACE700:

1. ObtaintheMultiVlibraryfilesfromyourLGSalesRepresentative.2. DoubleclicktheTrace700icononyourdesktoptolaunchTrace700.

OrFromtheStartmenu,selectProgramFiles>C.D.S. >Applications>TRACE700>TRACE700

3. ClicktheTRACE700LibraryTemplateEditor.TheLibrary/TemplateEditorsappears:

4. SelectthepathwherethelibraryfilewascopiedtoandselectImportCustomLibraryfromtheFileMenu.


Note:Duringlibraryfileimport,ifshownanoptiontooverwriteanexistingduplicatelibrarydataforLGMultiVproductsfromtheimportfile,setto"yes"thisoptionwillallowtooverwriteanexistingdatabase.

5. Closethedialogbox.6. ClosetheLibrary/TemplateEditors.7. InTRACE700,clickFile>Exittoclosetheprogram.


MultiV(AirSource)SystemCreateSystemsThefollowingproceduredemonstrateshowtomodeltheMultiVsystem,coolingandheatingequipment,aswellasassigningthecoilloads.Tocreateasystem:

1. TheMultiVsystemtypeinTRACEislistedundertheVariableVolumesystemcategoryundertheCreateSystemssection.

2. PickVariableRefrigerantVolumeasthesystemtype.3. ClickApplytosaveyourentries.


Fanselection Toselectafan:

1. OntheFanstaboftheCreateSystemsdialogbox,selectVRVIndoorFan.

2. Enterthetotalstaticpressureandfanenergyrateused.ThetotalstaticpressureandfanenergyrateisdifferentforeachtypeofMultiVindoorunit.NolibraryfileshavebeenprovidedforthezonelevelindoorVRFequipment.

3. Selectanindoorunit(IDU)foreachzone/spaceusingLGMultiVProductLineup.

4. Settotalstaticpressureoftheindoorunitfanatdesignflowrate.RefertotheLGsengineeringmanualforMultiVIndoorunitsandbuildingdesigndata.Pressurelossesshouldincludefilters,coils,anddistributionsystem.Designfullloadpowerofthesupplyfanperunitofsupplyairflowrateatsealevel.

5. TRACE700currentlydoesnotutilizelibraryfilesforzonelevelairsideequipment.Instead,asystemtypeisdefinedinTRACE,andthatsystemisassignedtotheappropriateTRACEPlant(eachindividualoutdoorVRFcompressorunit).Atthesystemlevelonlyasinglefandefinitionexistsfortheentiresystem,soanaverageassumedfanpowerdensitymustbeusedforthesystemwhichisanaveragerepresentationoftheassociatedzonesattachedtothatsystem.


CreatePlantsNext,describethecoolingandheatingplantsrepresentedbytheVRFsystemandbackupelectricresistanceheat.VRFplantsareconsideredAirCooledUnitaryplants.Tocreateplants:

1. DragtheappropriateiconsfromtheEquipmentCategorysectiontodefineeachplant.

2. RenamethecoolingplantasVRFandtheheatingplantasBackupelectricresistancebyselectingtheplantandclickingtheEditbutton.

3. SelectthecoolingplantandclickontheCoolingEquipmenttab.4. ChoosetheVRFplantthatbestmatchesthetargetperformanceand

operation.Therearetwocategoriesofplantavailable:VRFHeatPumpandVRFHeatRecovery.


5. SpecifyBackupelectricresistanceasthebackupheatsource.6. Ifnecessary,ontheHeatingEquipmenttab,refineabackupheating

plant.7. Finally,assigneachcoilloadtotheappropriateplant.


Note1:TheVRFHeatRecoveryoptionisabletorecoverheatfromoneVRFindoorunitandshareitwithotherindoorunitsthatareconnectedtothesamerefrigerantcircuit.TRACEassumesthatheatcanberecoveredbetweenallzonesthatareassignedtothesystem.ToaccuratelymodelVRFheatrecovery,thedesigncapacityofalltheindoorunits(zones)assignedtothesystemshouldbenolargerthantheavailablecapacityoftheVRFHeatRecoveryoutdoorunit.Thismightrequirethecreationofseveralsystemsandseveralcoolingplants.TheTRACE700forairsourceheatpumpsystemrequirestheoptionfortheheatrejectfanpowerhowever,MultiVAirperformancelibrarydataarealreadyincludedfanpowerinformationintheperformancecurves.


MultiVWater(WaterSource)System

AWLHPloopisprimarilyintendedtoservewaterloopheatpumpsystems.IndividualWLHPunitsoperateaccordingtotheirzonethermostats,andrejectheattoortakeheatfromthisloop.Dependingontherelativenumberofunitsoperatingintheheatingorcoolingmode,theloopwillbethermallyunbalancedandthelooptemperaturewilleitherriseorfall.Oneormoreboilersandoneormorecoolingtowersoperatetokeeptheloopwithinspecifiedlimits.InadditiontoWLHPunits,anycoolingunitwithawatercooledcondensermaybeassignedtothisloop.CreateSystems

TomodelanappliedWSHPsystem,beginbydefiningairdistribution:

1. PickWaterSourceHeatPumpasthesystemtype.2. ClickApplytosaveentries.


Fanselection Toselectafan:

1. OntheFanstaboftheCreateSystemsdialogbox,selectHydronicinheatpumpfanandenterthetotalstaticpressureandfanenergyrateused.ThetotalstaticpressureandfanenergyratewillbedifferentforeachtypeofMultiVindoorunit.

2. Setthetotalstaticpressureoftheindoorunitfanatdesignflowrate.RefertotheLGsengineeringmanualforMultiVIndoorunitsandbuildingdesigndata.Pressurelossesshouldincludefilters,coils,anddistributionsystem.

CreatePlants Tocreateaplant:

1. Next,describethecoolingandheatingplantsrepresentedbytheWSHPsystemandbackupboiler.

2. DragtheappropriateiconsfromtheEquipmentCategorysectiontodefineeachplant.

3. RenamethecoolingplantasWSHPandtheheatingplantasBackupboiler.


4. SelectthecoolingplantandclicktheCoolingEquipmenttab.5. Choosethewatersourceheatpumpthatbestmatchesthetarget

performance.6. Enterthefullloadconsumptionofthepumpthatservesthecommonwater

looptheprimarychilledwaterpump,inthiscase.

7. ClickControlstoassigntheexcessheatfromthecommonwaterlooptoloads

servedbytheheatingplantidentifiedastheenergysource.

Note:Donotremovethermalstorage.ThewaterloopismodeledasaspecialthermalstoragetypeinTRACE700.Removingthethermalstorageeliminatesthewaterloopfromthesimulation.

8. Besuretoapplyyourchanges.OntheHeatingEquipmenttab,picktheboiler

thatmostcloselymatchestheanticipatedperformance.


9. Enterthefullloadconsumptionofthepumpthatcirculateshotwaterfromtheboiler.

Note:Theminimumoperatingcondensertemperatureoftheselectedheatpumpdetermineswhentheboilerturnsontomaintainthecondenserwatertemperature.Tovieworalterthisentry,usetheLibrary/TemplateEditorsprogram.

10. Finally,assigneachcoilloadtotheappropriateplant.


DedicatedOutdoorAirSystem/EnergyRecoveryVentilatorAnenthalpywheelisarevolvingcylinderfilledwithadesiccanttreatedmediumthatissuitedfortransferringsensibleandlatentheat.Heattransferoccurswhenadjacentairstreams(usuallysupplyandexhaust)passthroughthewheelinacounterflowarrangement.Theexchangemediuminsidethewheelcollectssensibleheatfromthewarmerofthetwoairstreamsandreleasesitinthecoolerairstream.Latentheattransferoccursasthemediumcollectsmoisturefromthemorehumidairstreamandreleasesit,throughevaporation,inthedrierairstream.Likeotherenergyrecoverydevices,enthalpywheelscanyieldsignificantenergysavingsinsystemsthatexhaustlargeamountsofair.Theirrecentgrowthinpopularitycanbeattributed,atleastinpart,totheincreasedventilationrequirementsmandatedbyASHRAEStandard62toprovideacceptableindoorairquality.Applicationconsiderations_Theairstreamstargetedforenergytransfer(usuallyexhaustairandventilationair)mustbesituatedneareachother.Figure46Enthalpywheel


_Enthalpywheelscanrecoverbothlatentheatandsensibleheatwithaneffectivenessthattypicallyrangesfrom65percentto80percent.Addingawheelusuallyincreasesthesystemstaticpressureby0.4in.wgto0.7in.wg._Crosscontaminationbetweenairstreamsispossible.Tominimizeaircarryoverincriticalapplications,addaneffectivepurgearrangement.Placementofthefaninrelationtothewheelshouldpromoteleakagefromtheoutdoor(ventilation)airstreamtotheexhaustairstreamratherthanthereverse._Therelativelycompactsizeofanenthalpywheelcanpermitfactoryinstallationinairhandlers,rooftopairconditioners,andsometerminaldevicessuchasunitventilators._Climatesthateconomicallyfavorheatpumpsaregoodcandidatesforsuccessfulenthalpywheelapplications.Whenappliedincoldclimates,itmaybenecessarytosupplementtheheatingcapacityofthewheelbyaddingpreheat.SamplescenarioTheairdistributionsystemforabuildingincludesanenthalpywheelwithaneffectivenessof70percent.Thewheelpreconditionstheoutdoorairenteringthebuildingbyexchangingbothsensibleandlatentheatwiththemainexhaustairstream.Whenoperatingintheheatingmode,thewheelwarmsandhumidifiestheoutdoorair;duringthecoolingmode,itcoolsanddehumidifies.Page422illustrateshowtomodeltheenthalpywheelinthisexample.Afterchoosinganairsidesystem:1Pickthedesiredtypeofexhaustairheatrecoveryfromtheoptionsavailable.Forthisexample,selectenthalpywheel.Bydefault,itsprocessairstreamislocatedontheventilationdeck.


2Describethewheelseffectivenessthatis,howefficientlyitrecoversenergy.3Identifythescavengerairstreambydescribingthelocationoftheexhaustsidedeck.4Choosetheschedulethatdescribeswhentheenthalpywheelispermittedtooperate.


Appendix:MultiVperformanceDataLibraryPleasecontacttohttp://www.lgvrf.comorLGMultiVSalesRepresentatives.


References1. Modeling Guide Trane TRACE700 Building Energy and Economic Analysis

version6.2,AmericanStandardInc.20122. 2012 ASHRAE HandbookHVAC Systems and Equipment, Chapter 18

VariableRefrigerantFlow3. ASHRAE/IESNAStandard90.12007:http://www.ashrae.org

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