VRF-ES-EL-001-US 014B07 LGEngineeringStudy Trace700 BuildingEnergyModelingGuide 20140207133650

VRF‐ES‐EL‐001‐US 014B07

TRACE™ 700 Building Energy Modeling Guide for

LG Multi V™

VRF‐ES‐EL‐001‐US 014B07 of 24

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


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.


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.


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.


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.


Import Library

TheTRACE700programincludesaseparateLibrary/TemplateEditorapplicationthatletsusersviewthedetailedinformationfoundinthestandardtemplatesandlibraries.UsetheTRACE700“LibraryTemplateEditor”toimportthelibraryfileaccompanyingthisdocument.

ToImportthelibrary:

1. ClickEquipmentontheLibrariesmenu.

2. Select“ExportCustomLibrary”fromthe“File”Menu.

3. Renamethelibrary.expfiletooriginal_libray.exp.Thisallowsuserstheabilitytoreturntothedefaultfileifneeded.


4. Closethedialogbox.

Testing the Library File

Totestthelibraryfile:

1. ClickEquipmentontheLibrariesmenu.

2. ClickCoolingontheEquipmentmenu.TheLibrary/TemplateEditorsprogramwilldisplaytheCoolingEquipmentwindow.

3. ViewcurrentEquipmentlistsintheTRACE700DataDirectory.


5. ClosetheLibrary/TemplateEditors.


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.


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.


6. ClosetheLibrary/TemplateEditors.

7. InTRACE700,clickFile>Exittoclosetheprogram.


Multi V (Air Source) System

Create Systems

ThefollowingproceduredemonstrateshowtomodeltheMultiVsystem,coolingandheatingequipment,aswellasassigningthecoilloads.

Tocreateasystem:

1. TheMultiVsystemtypeinTRACEislistedunderthe“VariableVolume”systemcategoryunderthe“CreateSystems”section.

2. PickVariableRefrigerantVolumeasthesystemtype.

3. ClickApplytosaveyourentries.


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.


Create Plants

Next,describethecoolingandheatingplantsrepresentedbytheVRFsystemandbackupelectricresistanceheat.VRFplantsareconsideredAir‐CooledUnitaryplants.

Tocreateplants:

1. DragtheappropriateiconsfromtheEquipmentCategorysectiontodefineeachplant.

2. RenamethecoolingplantasVRFandtheheatingplantasBackupelectricresistancebyselectingtheplantandclickingtheEditbutton.

3. SelectthecoolingplantandclickontheCoolingEquipmenttab.

4. ChoosetheVRFplantthatbestmatchesthetargetperformanceandoperation.Therearetwocategoriesofplantavailable:VRFHeatPumpandVRFHeatRecovery.


5. SpecifyBackupelectricresistanceasthebackupheatsource.

6. Ifnecessary,ontheHeatingEquipmenttab,refineabackupheatingplant.

7. Finally,assigneachcoilloadtotheappropriateplant.


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.


Multi V Water (Water Source) System

AWLHPloopisprimarilyintendedtoservewater‐loopheat‐pumpsystems.IndividualWLHPunitsoperateaccordingtotheirzonethermostats,andrejectheattoortakeheatfromthisloop.Dependingontherelativenumberofunitsoperatingintheheatingorcoolingmode,theloopwillbethermallyunbalancedandthelooptemperaturewilleitherriseorfall.Oneormoreboilersandoneormorecoolingtowersoperatetokeeptheloopwithinspecifiedlimits.InadditiontoWLHPunits,anycoolingunitwithawatercooledcondensermaybeassignedtothisloop.

Create Systems

TomodelanappliedWSHPsystem,beginbydefiningairdistribution:

1. PickWaterSourceHeatPumpasthesystemtype.2. ClickApplytosaveentries.


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.


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.


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.


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


_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.


2Describethewheel’seffectiveness—thatis,howefficientlyitrecoversenergy.

3Identifythescavengerairstreambydescribingthelocationoftheexhaustsidedeck.

4Choosetheschedulethatdescribeswhentheenthalpywheelispermittedtooperate.


Appendix: Multi V performance Data Library

Pleasecontacttohttp://www.lg‐vrf.comorLGMultiVSalesRepresentatives.


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

VRF-ES-EL-001-US 014B07 LGEngineeringStudy Trace700 BuildingEnergyModelingGuide 20140207133650

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