trace™ 700 building energy modeling guide for …...vrf‐es‐el‐001‐us 014b07 page 3 of 24...
TRANSCRIPT
VRF‐ES‐EL‐001‐US 014B07
TRACE™ 700 Building Energy Modeling Guide for
LG Multi V™
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TableofContents
This Guide ............................................................................................................................................ 3
1. Disclaimer .................................................................................................................................... 3
Import Library ...................................................................................................................................... 4
2. Testing the Library File ................................................................................................................. 8
3. Import the Multi V Library File ..................................................................................................... 9
Multi V III (Air Source) System ........................................................................................................... 11
4. Create Systems ........................................................................................................................... 11
5. Fan selection .............................................................................................................................. 12
6. Create Plants .............................................................................................................................. 13
Multi V Water II (Water Source) System ............................................................................................. 16
7. Create Systems ........................................................................................................................... 16
8. Fan selection .............................................................................................................................. 17
9. Create Plants .............................................................................................................................. 17
Energy Recovery Ventilator/ Dedicated Outdoor Air System .............................................................. 20
10. Application considerations ........................................................................................................ 20
11. Sample scenario ......................................................................................................................... 21
Appendix: Multi V performance Data Library ..................................................................................... 23
References ......................................................................................................................................... 24
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This Guide
TheTraneTrace700BuildingEnergyModelingGuideforLGMultiVcontainsstep‐by‐stepinstructionstohelpusersmodelLGMultiVsystemoptions.Thedefinitionsofthecode‐wordsarecitedfromModelingGuideTRACE®700BuildingEnergyandEconomicAnalysisversion6.2.
Disclaimer
TheBuildingEnergyModelingGuideandTraneTrace700libraryfilesareforcomparisonsandshouldbeusedasaguidelineonly.Buildingload/energyhasbeenapproximatedformodelingpurposesorinputvalueofequipment(capacity,powerinput,etc.),andactualresultsmayvarydependingonthesituation.TheconclusionsofthisModelingGuideandTraneTrace700libraryfiledonotguaranteeactualenergycostsorsavings.
ThisModelingGuideandTraneTrace700libraryfileareintendedasadesign‐andanalysisguidetohelpdesignersoptimizethedesignoftheLGMultiVVRFsystembasedonenergyutilization.Modelingaccuracyishighlydependentonuser‐supplieddata.Itistheuser’sresponsibilitytounderstandhowthedataenteredaffectsprogramoutput,andtounderstandthatanypredefinedlibrariesaretobeusedonlyasguidelinesandTraneTrace700libraryfileforenteringthatdata.ThecalculationresultsandreportsbythisguideandTraneTrace700libraryfilearemeanttoaidthesystemdesignerandarenotasubstitutefordesignservices,judgment,orexperience.
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USING Trane Trace 700 TO DESIGN VRF SYSTEMS
ThissectionbrieflydescribeshowtouseTRANETRACE700todesignVRFsystems.AllVRFdesignworkrequiresthesamegeneralfivestepprocedure:
1. DefinetheProblem.
Firstdefinethescopeandobjectivesofthedesignanalysis.
2. GatherData.
Beforedesigncalculationscanbeperformed,informationaboutthebuilding,itsenvironmentanditsHVACequipmentmustbegathered.Thisstepinvolvesextractingdatafrombuildingplans,evaluatingbuildingusageandstudyingHVACsystemneeds.Specifictypesofinformationneededinclude:
Weatherdataforthebuildingsite.
Constructionmaterialdataforenvelopesofexteriorandinteriorincludingwalls,roofs,windows,doors,andfloors.
Buildingsizeandlayoutdataincludingwall,roof,window,doorandfloorareas,exposureorientationsandexternalshadingfeatures.
Internalloadcharacteristicsdeterminedbylevelsandschedulesforoccupancy,lightingsystems,equipment,andventilationwithinthebuilding.
DataconcerningHVACequipment,controlsandcomponentstobeused.
Definetheutilityratesfortheproject
3. EnterDataIntoTRANETRACE700.
Next,useTRANETRACE700toenterbuildingandequipmentdata.WhenusingTRANETRACE700,yourbaseofoperationisthemainprogramwindow.Thendefinethefollowingtypesofdatawhichareneededforsystemdesignwork:
a. SelectWeatherData.
OpentheWeatherdialogboxusingeitherofthesemethods:
‐ IntheProjectNavigatorview,clickWeathericoninthetoolbarorclicktheSelectweatherinformationbuttoninthefloatingProjectNavigatortoolbar.
‐ Inanyview,usethemenubartoselectActions>SelectWeatherInfo.
Clickontheregionofthemapwherethebuildingislocatedtodisplayalistofavailableweatherlocationsforthatregion.
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Scrollthroughthelisttofindthedesiredlocationandselectit.ThelocationyoupickedappearsinthelowerleftcorneroftheWeatherdialogbox.
ClickOKtoreturntothemainscreen.
b. CreateSpaces/Rooms.
TRACEperformscoolingandheatingloadcalculationsforeachindividualroom,soa"room"isthesmallestspaceforwhichyoucancalculateloads.Aroomcanbeasingleofficesurroundedbywallsorcanbetheperimeterportionofalargeopen‐planofficearea.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,andmiscellaneousequipment
‐ Infiltration
‐ Ventilationrequirements
‐ Partitionwallsandexposedorslab‐on‐gradefloors
c. EnterSystemData.
Alongwithenteringroominformation,youalsoneedtodefinetheHVACairdistribution,or"airside,"systemsservingthebuildingsothattheprogramknowshowtosizethefansandcoils.ThisisdonebyselectingaSystemTypeandenteringanyappropriatesysteminformation.Aftertheprogramperformscoolingandheatingloadcalculationsforindividualrooms,itcalculatesroomairflows,coilloads,fansizes,andothersystemdesigninformation.DefiningtheSystemTypetellstheprogramhowtocalculatethisdesigninformation("block"vs."sum‐of‐peaks")andwhatcomponents(coils,fans,etc.)makeupthesystem.
4. UseTRANETRACE700toGenerateDesignReports.
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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.
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Import Library
TheTRACE700programincludesaseparateLibrary/TemplateEditorapplicationthatletsusersviewthedetailedinformationfoundinthestandardtemplatesandlibraries.UsetheTRACE700“LibraryTemplateEditor”toimportthelibraryfileaccompanyingthisdocument.
ToImportthelibrary:
1. ClickEquipmentontheLibrariesmenu.
2. Select“ExportCustomLibrary”fromthe“File”Menu.
3. Renamethelibrary.expfiletooriginal_libray.exp.Thisallowsuserstheabilitytoreturntothedefaultfileifneeded.
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4. Closethedialogbox.
Testing the Library File
Totestthelibraryfile:
1. ClickEquipmentontheLibrariesmenu.
2. ClickCoolingontheEquipmentmenu.TheLibrary/TemplateEditorsprogramwilldisplaytheCoolingEquipmentwindow.
3. ViewcurrentEquipmentlistsintheTRACE700DataDirectory.
4. Closethedialogbox.
5. ClosetheLibrary/TemplateEditors.
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Import the Multi V Library File
ToimporttheMultiVlibraryfileintoTRACE700:
1. ObtaintheMultiVlibraryfilesfromyourLGSalesRepresentative.
2. DoubleclicktheTrace700icononyourdesktoptolaunchTrace700.OrFromtheStartmenu,selectProgramFiles>C.D.S. >Applications>TRACE700>TRACE700
3. ClicktheTRACE700“LibraryTemplateEditor.TheLibrary/TemplateEditorsappears:
4. Selectthepathwherethelibraryfilewascopiedtoandselect“ImportCustomLibrary”fromthe“File”Menu.
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Note: During library file import, if shown an option to overwrite an existing duplicate library data for LG Multi V products from the import file, set to "yes" this option will allow to overwrite an existing database.
5. Closethedialogbox.
6. ClosetheLibrary/TemplateEditors.
7. InTRACE700,clickFile>Exittoclosetheprogram.
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Multi V (Air Source) System
Create Systems
ThefollowingproceduredemonstrateshowtomodeltheMultiVsystem,coolingandheatingequipment,aswellasassigningthecoilloads.
Tocreateasystem:
1. TheMultiVsystemtypeinTRACEislistedunderthe“VariableVolume”systemcategoryunderthe“CreateSystems”section.
2. PickVariableRefrigerantVolumeasthesystemtype.
3. ClickApplytosaveyourentries.
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Fan selection
Toselectafan:
1. OntheFanstabofthe“CreateSystems”dialogbox,selectVRVIndoorFan.
2. Enterthetotalstaticpressureandfanenergyrateused.ThetotalstaticpressureandfanenergyrateisdifferentforeachtypeofMultiVindoorunit.NolibraryfileshavebeenprovidedforthezonelevelindoorVRFequipment.
3. Selectanindoorunit(IDU)foreachzone/spaceusingLGMultiVProductLineup.
4. Settotalstaticpressureoftheindoorunitfanatdesignflowrate.RefertotheLG’sengineeringmanualforMultiVIndoorunitsandbuildingdesigndata.Pressurelossesshouldincludefilters,coils,anddistributionsystem.Designfull‐loadpowerofthesupplyfanperunitofsupplyairflowrateatsealevel.
5. TRACE700currentlydoesnotutilizelibraryfilesforzonelevelairsideequipment.Instead,asystemtypeisdefinedinTRACE,andthatsystemisassignedtotheappropriateTRACE“Plant”(eachindividualoutdoorVRFcompressorunit).Atthesystemlevelonlyasinglefandefinitionexistsfortheentiresystem,soanaverageassumedfanpowerdensitymustbeusedforthesystemwhichisanaveragerepresentationoftheassociatedzonesattachedtothatsystem.
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Create Plants
Next,describethecoolingandheatingplantsrepresentedbytheVRFsystemandbackupelectricresistanceheat.VRFplantsareconsideredAir‐CooledUnitaryplants.
Tocreateplants:
1. DragtheappropriateiconsfromtheEquipmentCategorysectiontodefineeachplant.
2. RenamethecoolingplantasVRFandtheheatingplantasBackupelectricresistancebyselectingtheplantandclickingtheEditbutton.
3. SelectthecoolingplantandclickontheCoolingEquipmenttab.
4. ChoosetheVRFplantthatbestmatchesthetargetperformanceandoperation.Therearetwocategoriesofplantavailable:VRFHeatPumpandVRFHeatRecovery.
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5. SpecifyBackupelectricresistanceasthebackupheatsource.
6. Ifnecessary,ontheHeatingEquipmenttab,refineabackupheatingplant.
7. Finally,assigneachcoilloadtotheappropriateplant.
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Note1: The VRF Heat Recovery option is able to recover heat from one VRF indoor unit and share it with other indoor units that are connected to the same refrigerant circuit. TRACE assumes that heat can be recovered between all zones that are assigned to the system. To accurately model VRF heat recovery, the design capacity of all the indoor units (zones) assigned to the system should be no larger than the available capacity of the VRF Heat Recovery outdoor unit. This might require the creation of several systems and several cooling plants. The TRACE 700 for air source heat pump system requires the option for the heat reject fan power however, Multi V Air performance library data are already included fan power information in the performance curves.
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Multi V Water (Water Source) System
AWLHPloopisprimarilyintendedtoservewater‐loopheat‐pumpsystems.IndividualWLHPunitsoperateaccordingtotheirzonethermostats,andrejectheattoortakeheatfromthisloop.Dependingontherelativenumberofunitsoperatingintheheatingorcoolingmode,theloopwillbethermallyunbalancedandthelooptemperaturewilleitherriseorfall.Oneormoreboilersandoneormorecoolingtowersoperatetokeeptheloopwithinspecifiedlimits.InadditiontoWLHPunits,anycoolingunitwithawatercooledcondensermaybeassignedtothisloop.
Create Systems
TomodelanappliedWSHPsystem,beginbydefiningairdistribution:
1. PickWaterSourceHeatPumpasthesystemtype.2. ClickApplytosaveentries.
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Fan selection
Toselectafan:
1. OntheFanstabofthe“CreateSystems”dialogbox,selectHydronicinheatpumpfanandenterthetotalstaticpressureandfanenergyrateused.ThetotalstaticpressureandfanenergyratewillbedifferentforeachtypeofMultiVindoorunit.
2. Setthetotalstaticpressureoftheindoorunitfanatdesignflowrate.RefertotheLG’sengineeringmanualforMultiVIndoorunitsandbuildingdesigndata.Pressurelossesshouldincludefilters,coils,anddistributionsystem.
Create Plants
Tocreateaplant:
1. Next,describethecoolingandheatingplantsrepresentedbytheWSHPsystemandbackupboiler.
2. DragtheappropriateiconsfromtheEquipmentCategorysectiontodefineeachplant.
3. RenamethecoolingplantasWSHPandtheheatingplantasBackupboiler.
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4. SelectthecoolingplantandclicktheCoolingEquipmenttab.5. Choosethewater‐sourceheatpumpthatbestmatchesthetarget
performance.6. Enterthefull‐loadconsumptionofthepumpthatservesthecommonwater
loop—theprimarychilled‐waterpump,inthiscase.
7. ClickControlstoassigntheexcessheatfromthecommonwaterlooptoloadsservedbytheheatingplantidentifiedastheenergysource.
Note: Do not remove thermal storage. The water loop is modeled as a special thermal storage type in TRACE 700. Removing the thermal storage eliminates the water loop from the simulation.
8. Besuretoapplyyourchanges.OntheHeatingEquipmenttab,picktheboiler
thatmostcloselymatchestheanticipatedperformance.
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9. Enterthefull‐loadconsumptionofthepumpthatcirculateshotwaterfromtheboiler.
Note: The minimum operating condenser temperature of the selected heat pump determines when the boiler turns on to maintain the condenser water temperature. To view or alter this entry, use the Library/Template Editors program.
10. Finally,assigneachcoilloadtotheappropriateplant.
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Dedicated Outdoor Air System /Energy Recovery Ventilator
Anenthalpywheelisarevolvingcylinderfilledwithadesiccanttreatedmediumthatissuitedfortransferringsensibleandlatentheat.Heattransferoccurswhenadjacentairstreams(usuallysupplyandexhaust)passthroughthewheelinacounterflowarrangement.Theexchangemediuminsidethewheelcollectssensibleheatfromthewarmerofthetwoairstreamsandreleasesitinthecoolerairstream.Latentheattransferoccursasthemediumcollectsmoisturefromthemorehumidairstreamandreleasesit,throughevaporation,inthedrierairstream.
Likeotherenergy‐recoverydevices,enthalpywheelscanyieldsignificantenergysavingsinsystemsthatexhaustlargeamountsofair.Theirrecentgrowthinpopularitycanbeattributed,atleastinpart,totheincreasedventilationrequirementsmandatedbyASHRAEStandard62toprovideacceptableindoorairquality.
Application considerations
_Theairstreamstargetedforenergytransfer(usuallyexhaustairandventilationair)mustbesituatedneareachother.
Figure4‐6Enthalpywheel
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_Enthalpywheelscanrecoverbothlatentheatandsensibleheatwithaneffectivenessthattypicallyrangesfrom65percentto80percent.Addingawheelusuallyincreasesthesystemstaticpressureby0.4in.wgto0.7in.wg.
_Cross‐contaminationbetweenairstreamsispossible.Tominimizeaircarryoverincriticalapplications,addaneffectivepurgearrangement.Placementofthefaninrelationtothewheelshouldpromoteleakagefromtheoutdoor(ventilation)airstreamtotheexhaustairstreamratherthanthereverse.
_Therelativelycompactsizeofanenthalpywheelcanpermitfactoryinstallationinairhandlers,rooftopairconditioners,andsometerminaldevicessuchasunitventilators.
_Climatesthateconomicallyfavorheatpumpsaregoodcandidatesforsuccessfulenthalpy‐wheelapplications.Whenappliedincoldclimates,itmaybenecessarytosupplementtheheatingcapacityofthewheelbyaddingpreheat.
Sample scenario
Theair‐distributionsystemforabuildingincludesanenthalpywheelwithaneffectivenessof70percent.Thewheelpreconditionstheoutdoorairenteringthebuildingbyexchangingbothsensibleandlatentheatwiththemainexhaust‐airstream.
Whenoperatingintheheatingmode,thewheelwarmsandhumidifiestheoutdoorair;duringthecoolingmode,itcoolsanddehumidifies.
Page4‐22illustrateshowtomodeltheenthalpywheelinthisexample.
Afterchoosinganairsidesystem:
1Pickthedesiredtypeofexhaust‐airheatrecoveryfromtheoptionsavailable.
Forthisexample,selectenthalpywheel.Bydefault,itsprocessairstreamislocatedontheventilationdeck.
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2Describethewheel’seffectiveness—thatis,howefficientlyitrecoversenergy.
3Identifythescavengerairstreambydescribingthelocationoftheexhaustsidedeck.
4Choosetheschedulethatdescribeswhentheenthalpywheelispermittedtooperate.
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Appendix: Multi V performance Data Library
Pleasecontacttohttp://www.lg‐vrf.comorLGMultiVSalesRepresentatives.
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References 1. Modeling Guide Trane TRACE®700 Building Energy and Economic Analysis
version6.2,AmericanStandardInc.2012
2. 2012 ASHRAE Handbook—HVAC Systems and Equipment, Chapter 18VariableRefrigerantFlow
3. ASHRAE/IESNAStandard90.1‐2007:http://www.ashrae.org